LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
LM2587 SIMPLE SWITCHER
®
5A Flyback Regulator
Check for Samples: LM2587
1FEATURES DESCRIPTION
The LM2587 series of regulators are monolithic
23• Requires Few External Components integrated circuits specifically designed for flyback,
• Family of Standard Inductors and step-up (boost), and forward converter applications.
Transformers The device is available in 4 different output voltage
• NPN Output Switches 5.0A, can Stand Off 65V versions: 3.3V, 5.0V, 12V, and adjustable.
• Wide Input Voltage Range: 4V to 40V Requiring a minimum number of external
components, these regulators are cost effective, and
• Current-Mode Operation for Improved simple to use. Included in the datasheet are typical
Transient Response, Line Regulation, and circuits of boost and flyback regulators. Also listed
Current Limit are selector guides for diodes and capacitors and a
• 100 kHz Switching Frequency family of standard inductors and flyback transformers
• Internal Soft-Start Function Reduces In-Rush designed to work with these switching regulators.
Current During Start-Up The power switch is a 5.0A NPN device that can
• Output Transistor Protected by Current Limit, stand-off 65V. Protecting the power switch are current
Under Voltage Lockout, and Thermal and thermal limiting circuits, and an undervoltage
Shutdown lockout circuit. This IC contains a 100 kHz fixed-
frequency internal oscillator that permits the use of
• System Output Voltage Tolerance of ±4% Max small magnetics. Other features include soft start
Over Line and Load Conditions mode to reduce in-rush current during start up,
current mode control for improved rejection of input
TYPICAL APPLICATIONS voltage and output load transients and cycle-by-cycle
• Flyback Regulator current limiting. An output voltage tolerance of ±4%,
within specified input voltages and output load
• Multiple-Output Regulator conditions, is ensured for the power supply system.
• Simple Boost Regulator
• Forward Converter
Flyback Regulator
Figure 1.
1Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2SIMPLE SWITCHER, Switchers Made Simple are registered trademarks of Texas Instruments.
3All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Copyright © 2000–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
LM2587
SNVS115D –APRIL 2000–REVISED APRIL 2013
www.ti.com
Connection Diagrams
Figure 2. Bent, Staggered Leads Figure 3. Bent, Staggered Leads
5-Lead TO-220 (NDH) 5-Lead TO-220 (NDH)
Top View Side View
Figure 4. 5-Lead TO-263 (KTT) Figure 5. 5-Lead TO-263 (KTT)
Top View Side View
For Fixed Versions 3.3V, R1 = 3.4k, R2 = 2k5V, R1 = 6.15k, R2 = 2k12V, R1 = 8.73k, R2 = 1kFor Adj. VersionR1 =
Short (0Ω), R2 = Open
Figure 6. Block Diagram
2Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2587
LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
Test Circuits
CIN1—100 μF, 25V Aluminum Electrolytic CIN2—0.1 μF CeramicT—22 μH, 1:1 Schott
#67141450D—1N5820COUT—680 μF, 16V Aluminum Electrolytic CC—0.47 μF Ceramic RC—2k
Figure 7. LM2587-3.3 and LM2587-5.0 Test Circuit
CIN1—100 μF, 25V Aluminum Electrolytic CIN2—0.1 μF CeramicL—15 μH, Renco #RL-5472-5D—1N5820COUT—680
μF, 16V Aluminum Electrolytic CC—0.47 μF Ceramic RC—2kFor 12V Devices: R1= Short (0Ω) and R2= Open For
ADJ Devices: R1= 48.75k, ±0.1% and R2 = 5.62k, ±1%
Figure 8. LM2587-12 and LM2587-ADJ Test Circuit
Flyback Regulator Operation
The LM2587 is ideally suited for use in the flyback regulator topology. The flyback regulator can produce a single
output voltage, such as the one shown in Figure 9, or multiple output voltages. In Figure 9, the flyback regulator
generates an output voltage that is inside the range of the input voltage. This feature is unique to flyback
regulators and cannot be duplicated with buck or boost regulators.
The operation of a flyback regulator is as follows (refer to Figure 9): when the switch is on, current flows through
the primary winding of the transformer, T1, storing energy in the magnetic field of the transformer. Note that the
primary and secondary windings are out of phase, so no current flows through the secondary when current flows
through the primary. When the switch turns off, the magnetic field collapses, reversing the voltage polarity of the
primary and secondary windings. Now rectifier D1 is forward biased and current flows through it, releasing the
energy stored in the transformer. This produces voltage at the output.
The output voltage is controlled by modulating the peak switch current. This is done by feeding back a portion of
the output voltage to the error amp, which amplifies the difference between the feedback voltage and a 1.230V
reference. The error amp output voltage is compared to a ramp voltage proportional to the switch current (i.e.,
inductor current during the switch on time). The comparator terminates the switch on time when the two voltages
are equal, thereby controlling the peak switch current to maintain a constant output voltage.
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: LM2587
LM2587
SNVS115D –APRIL 2000–REVISED APRIL 2013
www.ti.com
As shown in Figure 9, the LM2587 can be used as a flyback regulator by using a minimum number of external
components. The switching waveforms of this regulator are shown in Figure 22. Typical Performance Characteristics
observed during the operation of this circuit are shown in Figure 23.
Figure 9. 12V Flyback Regulator Design Example
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
4Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2587
LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
Absolute Maximum Ratings(1)(2)
Input Voltage −0.4V ≤VIN ≤45V
Switch Voltage −0.4V ≤VSW ≤65V
Switch Current(3) Internally Limited
Compensation Pin Voltage −0.4V ≤VCOMP ≤2.4V
Feedback Pin Voltage −0.4V ≤VFB ≤2 VOUT
Storage Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 10 sec.) 260°C
Maximum Junction Temperature(4) 150°C
Power Dissipation (4) Internally Limited
Minimum ESD Rating (C = 100 pF, R = 1.5 kΩ) 2 kV
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions the
device is intended to be functional, but device parameter specifications may not be ensured under these conditions. For ensured
specifications and test conditions, see the Electrical Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.
(3) Note that switch current and output current are not identical in a step-up regulator. Output current cannot be internally limited when the
LM2587 is used as a step-up regulator. To prevent damage to the switch, the output current must be externally limited to 5A. However,
output current is internally limited when the LM2587 is used as a flyback regulator (see the Application Hints section for more
information).
(4) The junction temperature of the device (TJ) is a function of the ambient temperature (TA), the junction-to-ambient thermal resistance
(θJA), and the power dissipation of the device (PD). A thermal shutdown will occur if the temperature exceeds the maximum junction
temperature of the device: PD×θJA + TA(MAX) ≥TJ(MAX). For a safe thermal design, check that the maximum power dissipated by the
device is less than: PD≤[TJ(MAX) −TA(MAX))]/θJA. When calculating the maximum allowable power dissipation, derate the maximum
junction temperature—this ensures a margin of safety in the thermal design.
Operating Ratings
Supply Voltage 4V ≤VIN ≤40V
Output Switch Voltage 0V ≤VSW ≤60V
Output Switch Current ISW ≤5.0A
Junction Temperature Range −40°C ≤TJ≤+125°C
LM2587-3.3 Electrical Characteristics
Specifications with standard type face are for TJ= 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 5V.
Symbol Parameters Conditions Typical Min Max Units
SYSTEM PARAMETERS Test Circuit of Figure 7(1)
VOUT Output Voltage VIN = 4V to 12V 3.3 3.17/3.14 3.43/3.46 V
ILOAD = 400 mA to 1.75A
ΔVOUT/ Line Regulation VIN = 4V to 12V 20 50/100 mV
ΔVIN ILOAD = 400 mA
ΔVOUT/ Load Regulation VIN = 12V 20 50/100 mV
ΔILOAD ILOAD = 400 mA to 1.75A
ηEfficiency VIN = 12V, ILOAD = 1A 75 %
UNIQUE DEVICE PARAMETERS(2)
VREF Output Reference Measured at Feedback Pin 3.3 3.242/3.234 3.358/3.366 V
Voltage VCOMP = 1.0V
ΔVREF Reference Voltage VIN = 4V to 40V 2.0 mV
Line Regulation
GMError Amp ICOMP =−30 μA to +30 μA 1.193 0.678 2.259 mmho
Transconductance VCOMP = 1.0V
AVOL Error Amp VCOMP = 0.5V to 1.6V 260 151/75 V/V
Voltage Gain RCOMP = 1.0 MΩ(3)
(1) External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the
LM2587 is used as shown in Figure 7 and Figure 8, system performance will be as specified by the system parameters.
(2) All room temperature limits are 100% production tested, and all limits at temperature extremes are specified via correlation using
standard Statistical Quality Control (SQC) methods.
(3) A 1.0 MΩresistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL.
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: LM2587
LM2587
SNVS115D –APRIL 2000–REVISED APRIL 2013
www.ti.com
LM2587-5.0 Electrical Characteristics
Specifications with standard type face are for TJ= 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 5V.
Symbol Parameters Conditions Typical Min Max Units
SYSTEM PARAMETERS Test Circuit of Figure 7(1)
VOUT Output Voltage VIN = 4V to 12V 5.0 4.80/4.75 5.20/5.25 V
ILOAD = 500 mA to 1.45A
ΔVOUT/ Line Regulation VIN = 4V to 12V 20 50/100 mV
ΔVIN ILOAD = 500 mA
ΔVOUT/ Load Regulation VIN = 12V 20 50/100 mV
ΔILOAD ILOAD = 500 mA to 1.45A
ηEfficiency VIN = 12V, ILOAD = 750 mA 80 %
UNIQUE DEVICE PARAMETERS(2)
VREF Output Reference Measured at Feedback Pin 5.0 4.913/4.900 5.088/5.100 V
Voltage VCOMP = 1.0V
ΔVREF Reference Voltage VIN = 4V to 40V 3.3 mV
Line Regulation
GMError Amp ICOMP =−30 μA to +30 μA 0.750 0.447 1.491 mmho
Transconductance VCOMP = 1.0V
AVOL Error Amp VCOMP = 0.5V to 1.6V 165 99/49 V/V
Voltage Gain RCOMP = 1.0 MΩ(3)
(1) External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the
LM2587 is used as shown in Figure 7 and Figure 8, system performance will be as specified by the system parameters.
(2) All room temperature limits are 100% production tested, and all limits at temperature extremes are specified via correlation using
standard Statistical Quality Control (SQC) methods.
(3) A 1.0 MΩresistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL.
LM2587-12 Electrical Characteristics
Specifications with standard type face are for TJ= 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 5V.
Symbol Parameters Conditions Typical Min Max Units
SYSTEM PARAMETERS Test Circuit of Figure 8(1)
VOUT Output Voltage VIN = 4V to 10V 12.0 11.52/11.40 12.48/12.60 V
ILOAD = 300 mA to 1.2A
ΔVOUT/ Line Regulation VIN = 4V to 10V 20 100/200 mV
ΔVIN ILOAD = 300 mA
ΔVOUT/ Load Regulation VIN = 10V 20 100/200 mV
ΔILOAD ILOAD = 300 mA to 1.2A
ηEfficiency VIN = 10V, ILOAD = 1A 90 %
UNIQUE DEVICE PARAMETERS(2)
VREF Output Reference Measured at Feedback Pin 12.0 11.79/11.76 12.21/12.24 V
Voltage VCOMP = 1.0V
ΔVREF Reference Voltage VIN = 4V to 40 7.8 mV
Line Regulation
GMError Amp ICOMP =−30 μA to +30 μA 0.328 0.186 0.621 mmho
Transconductance VCOMP = 1.0V
AVOL Error Amp VCOMP = 0.5V to 1.6V 70 41/21 V/V
Voltage Gain RCOMP = 1.0 MΩ(3)
(1) External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the
LM2587 is used as shown in Figure 7 and Figure 8, system performance will be as specified by the system parameters.
(2) All room temperature limits are 100% production tested, and all limits at temperature extremes are specified via correlation using
standard Statistical Quality Control (SQC) methods.
(3) A 1.0 MΩresistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL.
6Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2587
LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
LM2587-ADJ Electrical Characteristics
Specifications with standard type face are for TJ= 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 5V.
Symbol Parameters Conditions Typical Min Max Units
SYSTEM PARAMETERS Test Circuit of Figure 8(1)
VOUT Output Voltage VIN = 4V to 10V 12.0 11.52/11.40 12.48/12.60 V
ILOAD = 300 mA to 1.2A
ΔVOUT/ Line Regulation VIN = 4V to 10V 20 100/200 mV
ΔVIN ILOAD = 300 mA
ΔVOUT/ Load Regulation VIN = 10V 20 100/200 mV
ΔILOAD ILOAD = 300 mA to 1.2A
ηEfficiency VIN = 10V, ILOAD = 1A 90 %
UNIQUE DEVICE PARAMETERS(2)
VREF Output Reference Measured at Feedback Pin 1.230 1.208/1.205 1.252/1.255 V
Voltage VCOMP = 1.0V
ΔVREF Reference Voltage VIN = 4V to 40V 1.5 mV
Line Regulation
GMError Amp ICOMP =−30 μA to +30 μA 3.200 1.800 6.000 mmho
Transconductance VCOMP = 1.0V
AVOL Error Amp VCOMP = 0.5V to 1.6V 670 400/200 V/V
Voltage Gain RCOMP = 1.0 MΩ(3)
IBError Amp VCOMP = 1.0V 125 425/600 nA
Input Bias Current
(1) External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the
LM2587 is used as shown in Figure 7 and Figure 8, system performance will be as specified by the system parameters.
(2) All room temperature limits are 100% production tested, and all limits at temperature extremes are specified via correlation using
standard Statistical Quality Control (SQC) methods.
(3) A 1.0 MΩresistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL.
All Output Voltage Versions Electrical Characteristics(1)
Specifications with standard type face are for TJ= 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 5V.
Symbol Parameters Conditions Typical Min Max Units
ISInput Supply Current (Switch Off) 11 15.5/16.5 mA
See(2)
ISWITCH = 3.0A 85 140/165 mA
VUV Input Supply RLOAD = 100Ω3.30 3.05 3.75 V
Undervoltage Lockout
fOOscillator Frequency Measured at Switch Pin
RLOAD = 100Ω100 85/75 115/125 kHz
VCOMP = 1.0V
fSC Short-Circuit Measured at Switch Pin
Frequency RLOAD = 100Ω25 kHz
VFEEDBACK = 1.15V
VEAO Error Amplifier Upper Limit 2.8 2.6/2.4 V
Output Swing See(3)
Lower Limit 0.25 0.40/0.55 V
See(2)
IEAO Error Amp See(4)
Output Current 165 110/70 260/320 μA
(Source or Sink)
(1) All room temperature limits are 100% production tested, and all limits at temperature extremes are specified via correlation using
standard Statistical Quality Control (SQC) methods.
(2) To measure this parameter, the feedback voltage is set to a high value, depending on the output version of the device, to force the error
amplifier output low. Adj: VFB = 1.41V; 3.3V: VFB = 3.80V; 5.0V: VFB = 5.75V; 12V: VFB = 13.80V.
(3) To measure this parameter, the feedback voltage is set to a low value, depending on the output version of the device, to force the error
amplifier output high. Adj: VFB = 1.05V; 3.3V: VFB = 2.81V; 5.0V: VFB = 4.25V; 12V: VFB = 10.20V.
(4) To measure the worst-case error amplifier output current, the LM2587 is tested with the feedback voltage set to its low value (specified
in Note 7) and at its high value (specified in Note 8).
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 7
Product Folder Links: LM2587
LM2587
SNVS115D –APRIL 2000–REVISED APRIL 2013
www.ti.com
All Output Voltage Versions Electrical Characteristics(1) (continued)
Specifications with standard type face are for TJ= 25°C, and those in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, VIN = 5V.
Symbol Parameters Conditions Typical Min Max Units
ISS Soft Start Current VFEEDBACK = 0.92V 11.0 8.0/7.0 17.0/19.0 μA
VCOMP = 1.0V
D Maximum Duty Cycle RLOAD = 100Ω98 93/90 %
See(3)
ILSwitch Leakage Switch Off 15 300/600 μA
Current VSWITCH = 60V
VSUS Switch Sustaining dV/dT = 1.5V/ns 65 V
Voltage
VSAT Switch Saturation ISWITCH = 5.0A 0.7 1.1/1.4 V
Voltage
ICL NPN Switch 6.5 5.0 9.5 A
Current Limit
COMMON DEVICE PARAMETERS(5)
θJA Thermal Resistance NDH Package, Junction to Ambient(6) 65
θJA NDH Package, Junction to Ambient(7) 45
θJC NDH Package, Junction to Case 2
θJA °C/W
KTT Package, Junction to Ambient(8) 56
θJA KTT Package, Junction to Ambient(9) 35
θJA KTT Package, Junction to Ambient(10) 26
θJC KTT Package, Junction to Case 2
(5) External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the
LM2587 is used as shown in Figure 7 and Figure 8, system performance will be as specified by the system parameters.
(6) Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads in a
socket, or on a PC board with minimum copper area.
(7) Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ½ inch leads
soldered to a PC board containing approximately 4 square inches of (1oz.) copper area surrounding the leads.
(8) Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board area of 0.136 square inches (the
same size as the TO-263 package) of 1 oz. (0.0014 in. thick) copper.
(9) Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board area of 0.4896 square inches
(3.6 times the area of the TO-263 package) of 1 oz. (0.0014 in. thick) copper.
(10) Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board copper area of 1.0064 square
inches (7.4 times the area of the TO-263 package) of 1 oz. (0.0014 in. thick) copper. Additional copper area will reduce thermal
resistance further. See the thermal model in Switchers Made Simple®software.
8Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2587
LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
Typical Performance Characteristics
Supply Current Reference Voltage
vs Temperature vs Temperature
Figure 10. Figure 11.
ΔReference Voltage Supply Current
vs Supply Voltage vs Switch Current
Figure 12. Figure 13.
Current Limit Feedback Pin Bias
vs Temperature Current vs Temperature
Figure 14. Figure 15.
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Links: LM2587
LM2587
SNVS115D –APRIL 2000–REVISED APRIL 2013
www.ti.com
Typical Performance Characteristics (continued)
Switch Saturation Switch Transconductance
Voltage vs Temperature vs Temperature
Figure 16. Figure 17.
Oscillator Frequency Error Amp Transconductance
vs Temperature vs Temperature
Figure 18. Figure 19.
Error Amp Voltage Short Circuit Frequency
Gain vs Temperature vs Temperature
Figure 20. Figure 21.
10 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2587
LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
Performance Characteristics
A: Switch Voltage, 10 V/divB: Switch Current, 5 A/divC: Output Rectifier Current, 5 A/divD: Output Ripple Voltage, 100 mV/div
AC-Coupled
Horizontal: 2 μs/div Figure 22. Switching Waveforms
Figure 23. VOUT Load Current Step Response
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 11
Product Folder Links: LM2587
LM2587
SNVS115D –APRIL 2000–REVISED APRIL 2013
www.ti.com
TYPICAL FLYBACK REGULATOR APPLICATIONS
Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 show six typical flyback applications, varying from single
output to triple output. Each drawing contains the part number(s) and manufacturer(s) for every component
except the transformer. For the transformer part numbers and manufacturers names, see the table in
TRANSFORMER SELECTION (T). For applications with different output voltages—requiring the LM2587-
ADJ—or different output configurations that do not match the standard configurations, refer to the Switchers
Made Simple software.
Figure 24. Single-Output Flyback Regulator
12 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2587
LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
Figure 29. Triple-Output Flyback Regulator
TRANSFORMER SELECTION (T)
Table 1 lists the standard transformers available for flyback regulator applications. Included in the table are the
turns ratio(s) for each transformer, as well as the output voltages, input voltage ranges, and the maximum load
currents for each circuit.
Table 1. Transformer Selection Table
Applications Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29
Transformers T1 T1 T1 T2 T3 T4
VIN 4V–6V 4V–6V 8V–16V 4V–6V 18V–36V 18V–36V
VOUT1 3.3V 5V 12V 12V 12V 5V
IOUT1 (Max) 1.8A 1.4A 1.2A 0.3A 1A 2.5A
N11 1 1 2.5 0.8 0.35
VOUT2 −12V −12V 12V
IOUT2 (Max) 0.3A 1A 0.5A
N22.5 0.8 0.8
VOUT3 −12V
IOUT3 (Max) 0.5A
N30.8
Table 2. Transformer Manufacturer Guide
Transformer Manufacturers' Part Numbers
Type Coilcraft(1) Coilcraft (1) Pulse (2) Renco(3) Schott(4)
Surface Mount Surface Mount
T1 Q4434-B Q4435-B PE-68411 RL-5530 67141450
T2 Q4337-B Q4436-B PE-68412 RL-5531 67140860
T3 Q4343-B — PE-68421 RL-5534 67140920
(1) Coilcraft Inc.,: Phone: (800) 322-26451102 Silver Lake Road, Cary, IL 60013: Fax: (708) 639-1469
(2) Pulse Engineering Inc.,: Phone: (619) 674-810012220 World Trade Drive, San Diego, CA 92128: Fax: (619) 674-8262
(3) Renco Electronics Inc.,: Phone: (800) 645-582860 Jeffryn Blvd. East, Deer Park, NY 11729: Fax: (516) 586-5562
(4) Schott Corp.,: Phone: (612) 475-11731000 Parkers Lane Road, Wayzata, MN 55391: Fax: (612) 475-1786
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 15
Product Folder Links: LM2587
LM2587
SNVS115D –APRIL 2000–REVISED APRIL 2013
www.ti.com
Table 2. Transformer Manufacturer Guide (continued)
Transformer Manufacturers' Part Numbers
Type Coilcraft(1) Coilcraft (1) Pulse (2) Renco(3) Schott(4)
Surface Mount Surface Mount
T4 Q4344-B — PE-68422 RL-5535 67140930
TRANSFORMER FOOTPRINTS
Figure 30,Figure 31,Figure 32,Figure 33,Figure 34,Figure 35,Figure 36,Figure 37,Figure 38 Figure 39,
Figure 40,Figure 41,Figure 42,Figure 43,Figure 44,Figure 45,Figure 46, and Figure 47 show the footprints of
each transformer, listed in Table 1.
T1 T2
Figure 30. Coilcraft Q4434-B (Top View) Figure 31. Coilcraft Q4337-B (Top View)
T3 T4
Figure 32. Coilcraft Q4343-B (Top View) Figure 33. Coilcraft Q4344-B (Top View)
T1 T2
Figure 34. Coilcraft Q4435-B (Surface Mount) (Top Figure 35. Coilcraft Q4436-B (Surface Mount) (Top
View) View)
T1 T2
Figure 36. Pulse PE-68411 (Surface Mount) (Top Figure 37. Pulse PE-68412 (Surface Mount) (Top
View) View)
16 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2587
LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
T3 T4
Figure 38. Pulse PE-68421 (Surface Mount) (Top Figure 39. Pulse PE-68422 (Surface Mount) (Top
View) View)
T1 T2
Figure 40. Renco RL-5530 (Top View) Figure 41. Renco RL-5531 (Top View)
T3 T4
Figure 42. Renco RL-5534 (Top View) Figure 43. Renco RL-5535 (Top View)
T1 T2
Figure 44. Schott 67141450 (Top View) Figure 45. Schott 67140860 (Top View)
T3 T4
Figure 46. Schott 67140920 (Top View) Figure 47. Schott 67140930 (Top View)
Step-Up (Boost) Regulator Operation
Figure 48 shows the LM2587 used as a step-up (boost) regulator. This is a switching regulator that produces an
output voltage greater than the input supply voltage.
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 17
Product Folder Links: LM2587
LM2587
SNVS115D –APRIL 2000–REVISED APRIL 2013
www.ti.com
A brief explanation of how the LM2587 Boost Regulator works is as follows (refer to Figure 48). When the NPN
switch turns on, the inductor current ramps up at the rate of VIN/L, storing energy in the inductor. When the
switch turns off, the lower end of the inductor flies above VIN, discharging its current through diode (D) into the
output capacitor (COUT) at a rate of (VOUT −VIN)/L. Thus, energy stored in the inductor during the switch on time
is transferred to the output during the switch off time. The output voltage is controlled by adjusting the peak
switch current, as described in the Flyback Regulator Operation section.
By adding a small number of external components (as shown in Figure 48), the LM2587 can be used to produce a
regulated output voltage that is greater than the applied input voltage. The switching waveforms observed during the
operation of this circuit are shown in Figure 49. Typical performance of this regulator is shown in Figure 50.
Figure 48. 12V Boost Regulator
Typical Performance Characteristics
A: Switch Voltage, 10 V/divB: Switch Current, 5 A/divC: Inductor Current, 5 A/divD: Output Ripple Voltage,
100 mV/div, AC-Coupled
Horizontal: 2 μs/div Figure 49. Switching Waveforms
Figure 50. VOUT Response to Load Current Step
Typical Boost Regulator Applications
Figure 51 and Figure 52 Figure 53 and Figure 54 show four typical boost applications)—one fixed and three
using the adjustable version of the LM2587. Each drawing contains the part number(s) and manufacturer(s) for
every component. For the fixed 12V output application, the part numbers and manufacturers' names for the
inductor are listed in a table in Figure 54. For applications with different output voltages, refer to the Switchers
Made Simple software.
18 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2587
LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
Figure 51. +5V to +12V Boost Regulator
Table 3 contains a table of standard inductors, by part number and corresponding manufacturer, for the fixed
output regulator of Figure 51.
Table 3. Inductor Selection Table
Coilcraft (1) Pulse (2) Renco(3) Schott(4)
R4793-A PE-53900 RL-5472-5 67146520
(1) Coilcraft Inc.,: Phone: (800) 322-26451102 Silver Lake Road, Cary, IL 60013: Fax: (708) 639-1469
(2) Pulse Engineering Inc.,: Phone: (619) 674-810012220 World Trade Drive, San Diego, CA 92128: Fax: (619) 674-8262
(3) Renco Electronics Inc.,: Phone: (800) 645-582860 Jeffryn Blvd. East, Deer Park, NY 11729: Fax: (516) 586-5562
(4) Schott Corp.,: Phone: (612) 475-11731000 Parkers Lane Road, Wayzata, MN 55391: Fax: (612) 475-1786
Figure 52. +12V to +24V Boost Regulator
Figure 53. +24V to +36V Boost Regulator
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 19
Product Folder Links: LM2587
LM2587
SNVS115D –APRIL 2000–REVISED APRIL 2013
www.ti.com
*The LM2587 will require a heat sink in these applications. The size of the heat sink will depend on the maximum
ambient temperature. To calculate the thermal resistance of the IC and the size of the heat sink needed, see the
“Heat Sink/Thermal Considerations” section in Application Hints.
Figure 54. +24V to +48V Boost Regulator
Application Hints
Figure 55. Boost Regulator
PROGRAMMING OUTPUT VOLTAGE
(SELECTING R1AND R2)
Referring to the adjustable regulator in Figure 55, the output voltage is programmed by the resistors R1and R2
by the following formula:
VOUT = VREF (1 + R1/R2) where VREF = 1.23V (1)
Resistors R1and R2divide the output voltage down so that it can be compared with the 1.23V internal reference.
With R2between 1k and 5k, R1is:
R1= R2(VOUT/VREF −1) where VREF = 1.23V (2)
For best temperature coefficient and stability with time, use 1% metal film resistors.
SHORT CIRCUIT CONDITION
Due to the inherent nature of boost regulators, when the output is shorted (see Figure 55), current flows directly
from the input, through the inductor and the diode, to the output, bypassing the switch. The current limit of the
switch does not limit the output current for the entire circuit. To protect the load and prevent damage to the
switch, the current must be externally limited, either by the input supply or at the output with an external current
limit circuit. The external limit should be set to the maximum switch current of the device, which is 5A.
In a flyback regulator application (Figure 56), using the standard transformers, the LM2587 will survive a short
circuit to the main output. When the output voltage drops to 80% of its nominal value, the frequency will drop to
25 kHz. With a lower frequency, off times are larger. With the longer off times, the transformer can release all of
its stored energy before the switch turns back on. Hence, the switch turns on initially with zero current at its
collector. In this condition, the switch current limit will limit the peak current, saving the device.
20 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2587
LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
FLYBACK REGULATOR INPUT CAPACITORS
A flyback regulator draws discontinuous pulses of current from the input supply. Therefore, there are two input
capacitors needed in a flyback regulator; one for energy storage and one for filtering (see Figure 56). Both are
required due to the inherent operation of a flyback regulator. To keep a stable or constant voltage supply to the
LM2587, a storage capacitor (≥100 μF) is required. If the input source is a recitified DC supply and/or the
application has a wide temperature range, the required rms current rating of the capacitor might be very large.
This means a larger value of capacitance or a higher voltage rating will be needed of the input capacitor. The
storage capacitor will also attenuate noise which may interfere with other circuits connected to the same input
supply voltage.
Figure 56. Flyback Regulator
In addition, a small bypass capacitor is required due to the noise generated by the input current pulses. To
eliminate the noise, insert a 1.0 μF ceramic capacitor between VIN and ground as close as possible to the device.
SWITCH VOLTAGE LIMITS
In a flyback regulator, the maximum steady-state voltage appearing at the switch, when it is off, is set by the
transformer turns ratio, N, the output voltage, VOUT, and the maximum input voltage, VIN (Max):
VSW(OFF) = VIN (Max) + (VOUT +VF)/N (3)
where VFis the forward biased voltage of the output diode, and is 0.5V for Schottky diodes and 0.8V for ultra-fast
recovery diodes (typically). In certain circuits, there exists a voltage spike, VLL, superimposed on top of the
steady-state voltage (see Figure 22, waveform A). Usually, this voltage spike is caused by the transformer
leakage inductance and/or the output rectifier recovery time. To “clamp” the voltage at the switch from exceeding
its maximum value, a transient suppressor in series with a diode is inserted across the transformer primary (as
shown in the circuit on the front page and other flyback regulator circuits throughout the datasheet). The
schematic in Figure 56 shows another method of clamping the switch voltage. A single voltage transient
suppressor (the SA51A) is inserted at the switch pin. This method clamps the total voltage across the switch, not
just the voltage across the primary.
If poor circuit layout techniques are used (see the CIRCUIT LAYOUT GUIDELINES section), negative voltage
transients may appear on the Switch pin (pin 4). Applying a negative voltage (with respect to the IC's ground) to
any monolithic IC pin causes erratic and unpredictable operation of that IC. This holds true for the LM2587 IC as
well. When used in a flyback regulator, the voltage at the Switch pin (pin 4) can go negative when the switch
turns on. The “ringing” voltage at the switch pin is caused by the output diode capacitance and the transformer
leakage inductance forming a resonant circuit at the secondary(ies). The resonant circuit generates the “ringing”
voltage, which gets reflected back through the transformer to the switch pin. There are two common methods to
avoid this problem. One is to add an RC snubber around the output rectifier(s), as in Figure 56. The values of the
resistor and the capacitor must be chosen so that the voltage at the Switch pin does not drop below −0.4V. The
resistor may range in value between 10Ωand 1 kΩ, and the capacitor will vary from 0.001 μF to 0.1 μF. Adding a
snubber will (slightly) reduce the efficiency of the overall circuit.
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 21
Product Folder Links: LM2587
LM2587
SNVS115D –APRIL 2000–REVISED APRIL 2013
www.ti.com
The other method to reduce or eliminate the “ringing” is to insert a Schottky diode clamp between pins 4 and 3
(ground), also shown in Figure 56. This prevents the voltage at pin 4 from dropping below −0.4V. The reverse
voltage rating of the diode must be greater than the switch off voltage.
Figure 57. Input Line Filter
OUTPUT VOLTAGE LIMITATIONS
The maximum output voltage of a boost regulator is the maximum switch voltage minus a diode drop. In a
flyback regulator, the maximum output voltage is determined by the turns ratio, N, and the duty cycle, D, by the
equation:
VOUT ≈N × VIN × D/(1 −D) (4)
The duty cycle of a flyback regulator is determined by the following equation:
(5)
Theoretically, the maximum output voltage can be as large as desired—just keep increasing the turns ratio of the
transformer. However, there exists some physical limitations that prevent the turns ratio, and thus the output
voltage, from increasing to infinity. The physical limitations are capacitances and inductances in the LM2587
switch, the output diode(s), and the transformer—such as reverse recovery time of the output diode (mentioned
above).
NOISY INPUT LINE CONDITION)
A small, low-pass RC filter should be used at the input pin of the LM2587 if the input voltage has an unusual
large amount of transient noise, such as with an input switch that bounces. The circuit in Figure 57 demonstrates
the layout of the filter, with the capacitor placed from the input pin to ground and the resistor placed between the
input supply and the input pin. Note that the values of RIN and CIN shown in the schematic are good enough for
most applications, but some readjusting might be required for a particular application. If efficiency is a major
concern, replace the resistor with a small inductor (say 10 μH and rated at 100 mA).
STABILITY
All current-mode controlled regulators can suffer from an instability, known as subharmonic oscillation, if they
operate with a duty cycle above 50%. To eliminate subharmonic oscillations, a minimum value of inductance is
required to ensure stability for all boost and flyback regulators. The minimum inductance is given by:
(6)
where VSAT is the switch saturation voltage and can be found in the Characteristic Curves.
22 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2587
LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
Figure 58. Circuit Board Layout
CIRCUIT LAYOUT GUIDELINES
As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring
inductance generate voltage transients which can cause problems. For minimal inductance and ground loops,
keep the length of the leads and traces as short as possible. Use single point grounding or ground plane
construction for best results. Separate the signal grounds from the power grounds (as indicated in Figure 58).
When using the Adjustable version, physically locate the programming resistors as near the regulator IC as
possible, to keep the sensitive feedback wiring short.
HEAT SINK/THERMAL CONSIDERATIONS
In many cases, no heat sink is required to keep the LM2587 junction temperature within the allowed operating
range. For each application, to determine whether or not a heat sink will be required, the following must be
identified:
1) Maximum ambient temperature (in the application).
2) Maximum regulator power dissipation (in the application).
3) Maximum allowed junction temperature (125°C for the LM2587). For a safe, conservative design, a
temperature approximately 15°C cooler than the maximum junction temperature should be selected (110°C).
4) LM2587 package thermal resistances θJA and θJC (given in the Electrical Characteristics).
Total power dissipated (PD) by the LM2587 can be estimated as follows:
Boost:
(7)
VIN is the minimum input voltage, VOUT is the output voltage, N is the transformer turns ratio, D is the duty cycle,
and ILOAD is the maximum load current (and ∑ILOAD is the sum of the maximum load currents for multiple-output
flyback regulators). The duty cycle is given by:
Boost:
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 23
Product Folder Links: LM2587
LM2587
SNVS115D –APRIL 2000–REVISED APRIL 2013
www.ti.com
(8)
where VFis the forward biased voltage of the diode and is typically 0.5V for Schottky diodes and 0.8V for fast
recovery diodes. VSAT is the switch saturation voltage and can be found in the Characteristic Curves.
When no heat sink is used, the junction temperature rise is:
ΔTJ= PD×θJA. (9)
Adding the junction temperature rise to the maximum ambient temperature gives the actual operating junction
temperature:
TJ=ΔTJ+ TA. (10)
If the operating junction temperature exceeds the maximum junction temperatue in item 3 above, then a heat
sink is required. When using a heat sink, the junction temperature rise can be determined by the following:
ΔTJ= PD× (θJC +θInterface +θHeat Sink) (11)
Again, the operating junction temperature will be:
TJ=ΔTJ+ TA(12)
As before, if the maximum junction temperature is exceeded, a larger heat sink is required (one that has a lower
thermal resistance).
Included in the Switchers Made Simple design software is a more precise (non-linear) thermal model that can
be used to determine junction temperature with different input-output parameters or different component values.
It can also calculate the heat sink thermal resistance required to maintain the regulator junction temperature
below the maximum operating temperature.
To further simplify the flyback regulator design procedure, TI is making available computer design software.
Switchers Made Simple software is available on a (3½″) diskette for IBM compatible computers from a TI sales
office in your area or the TI WEBENCH Design Center team.
http://www.ti.com/ww/en/analog/webench/index.shtml?DCMP=hpa_sva_webench&HQS=webench-bb
European Magnetic Vendor
Contacts
Please contact the following addresses for details of local distributors or representatives:
Coilcraft
21 Napier Place
Wardpark North Cumbernauld, Scotland G68 0LL Phone: +44 1236 730 595 Fax: +44 1236 730 627
Pulse Engineering
Dunmore Road
Tuam Co. Galway, Ireland Phone: +353 93 24 107 Fax: +353 93 24 459
24 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LM2587
LM2587
www.ti.com
SNVS115D –APRIL 2000–REVISED APRIL 2013
REVISION HISTORY
Changes from Revision C (April 2013) to Revision D Page
• Changed layout of National Data Sheet to TI format .......................................................................................................... 24
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 25
Product Folder Links: LM2587
PACKAGE OPTION ADDENDUM
www.ti.com 17-Mar-2017
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM2587S-12/NOPB ACTIVE DDPAK/
TO-263 KTT 5 45 Pb-Free (RoHS
Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2587S
-12 P+
LM2587S-3.3/NOPB ACTIVE DDPAK/
TO-263 KTT 5 45 Pb-Free (RoHS
Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2587S
-3.3 P+
LM2587S-5.0 NRND DDPAK/
TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2587S
-5.0 P+
LM2587S-5.0/NOPB ACTIVE DDPAK/
TO-263 KTT 5 45 Pb-Free (RoHS
Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2587S
-5.0 P+
LM2587S-ADJ NRND DDPAK/
TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2587S
-ADJ P+
LM2587S-ADJ/NOPB ACTIVE DDPAK/
TO-263 KTT 5 45 Pb-Free (RoHS
Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2587S
-ADJ P+
LM2587SX-12/NOPB ACTIVE DDPAK/
TO-263 KTT 5 500 Pb-Free (RoHS
Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2587S
-12 P+
LM2587SX-5.0/NOPB ACTIVE DDPAK/
TO-263 KTT 5 500 Pb-Free (RoHS
Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2587S
-5.0 P+
LM2587SX-ADJ NRND DDPAK/
TO-263 KTT 5 500 TBD Call TI Call TI -40 to 125 LM2587S
-ADJ P+
LM2587SX-ADJ/NOPB ACTIVE DDPAK/
TO-263 KTT 5 500 Pb-Free (RoHS
Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2587S
-ADJ P+
LM2587T-12/NOPB ACTIVE TO-220 NDH 5 45 Pb-Free (RoHS
Exempt) CU SN Level-1-NA-UNLIM -40 to 125 LM2587T
-12 P+
LM2587T-3.3/NOPB ACTIVE TO-220 NDH 5 45 Pb-Free (RoHS
Exempt) CU SN Level-1-NA-UNLIM -40 to 125 LM2587T
-3.3 P+
LM2587T-5.0/NOPB ACTIVE TO-220 NDH 5 45 Pb-Free (RoHS
Exempt) CU SN Level-1-NA-UNLIM -40 to 125 LM2587T
-5.0 P+
LM2587T-ADJ NRND TO-220 NDH 5 45 TBD Call TI Call TI -40 to 125 LM2587T
-ADJ P+
LM2587T-ADJ/NOPB ACTIVE TO-220 NDH 5 45 Pb-Free (RoHS
Exempt) CU SN Level-1-NA-UNLIM -40 to 125 LM2587T
-ADJ P+
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PACKAGE OPTION ADDENDUM
www.ti.com 17-Mar-2017
Addendum-Page 2
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LM2587SX-12/NOPB DDPAK/
TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2587SX-5.0/NOPB DDPAK/
TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2587SX-ADJ DDPAK/
TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
LM2587SX-ADJ/NOPB DDPAK/
TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2
PACKAGE MATERIALS INFORMATION
www.ti.com 23-Sep-2013
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LM2587SX-12/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0
LM2587SX-5.0/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0
LM2587SX-ADJ DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0
LM2587SX-ADJ/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0
PACKAGE MATERIALS INFORMATION
www.ti.com 23-Sep-2013
Pack Materials-Page 2
MECHANICAL DATA
NDH0005D
www.ti.com
MECHANICAL DATA
KTT0005B
www.ti.com
BOTTOM SIDE OF PACKAGE
TS5B (Rev D)
IMPORTANT NOTICE
Texas Instruments Incorporated (TI) reserves the right to make corrections, enhancements, improvements and other changes to its
semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers
should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
TI’s published terms of sale for semiconductor products (http://www.ti.com/sc/docs/stdterms.htm) apply to the sale of packaged integrated
circuit products that TI has qualified and released to market. Additional terms may apply to the use or sale of other types of TI products and
services.
Reproduction of significant portions of TI information in TI data sheets is permissible only if reproduction is without alteration and is
accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for such reproduced
documentation. Information of third parties may be subject to additional restrictions. Resale of TI products or services with statements
different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the
associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Buyers and others who are developing systems that incorporate TI products (collectively, “Designers”) understand and agree that Designers
remain responsible for using their independent analysis, evaluation and judgment in designing their applications and that Designers have
full and exclusive responsibility to assure the safety of Designers' applications and compliance of their applications (and of all TI products
used in or for Designers’ applications) with all applicable regulations, laws and other applicable requirements. Designer represents that, with
respect to their applications, Designer has all the necessary expertise to create and implement safeguards that (1) anticipate dangerous
consequences of failures, (2) monitor failures and their consequences, and (3) lessen the likelihood of failures that might cause harm and
take appropriate actions. Designer agrees that prior to using or distributing any applications that include TI products, Designer will
thoroughly test such applications and the functionality of such TI products as used in such applications.
TI’s provision of technical, application or other design advice, quality characterization, reliability data or other services or information,
including, but not limited to, reference designs and materials relating to evaluation modules, (collectively, “TI Resources”) are intended to
assist designers who are developing applications that incorporate TI products; by downloading, accessing or using TI Resources in any
way, Designer (individually or, if Designer is acting on behalf of a company, Designer’s company) agrees to use any particular TI Resource
solely for this purpose and subject to the terms of this Notice.
TI’s provision of TI Resources does not expand or otherwise alter TI’s applicable published warranties or warranty disclaimers for TI
products, and no additional obligations or liabilities arise from TI providing such TI Resources. TI reserves the right to make corrections,
enhancements, improvements and other changes to its TI Resources. TI has not conducted any testing other than that specifically
described in the published documentation for a particular TI Resource.
Designer is authorized to use, copy and modify any individual TI Resource only in connection with the development of applications that
include the TI product(s) identified in such TI Resource. NO OTHER LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE
TO ANY OTHER TI INTELLECTUAL PROPERTY RIGHT, AND NO LICENSE TO ANY TECHNOLOGY OR INTELLECTUAL PROPERTY
RIGHT OF TI OR ANY THIRD PARTY IS GRANTED HEREIN, including but not limited to any patent right, copyright, mask work right, or
other intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
regarding or referencing third-party products or services does not constitute a license to use such products or services, or a warranty or
endorsement thereof. Use of TI Resources may require a license from a third party under the patents or other intellectual property of the
third party, or a license from TI under the patents or other intellectual property of TI.
TI RESOURCES ARE PROVIDED “AS IS” AND WITH ALL FAULTS. TI DISCLAIMS ALL OTHER WARRANTIES OR
REPRESENTATIONS, EXPRESS OR IMPLIED, REGARDING RESOURCES OR USE THEREOF, INCLUDING BUT NOT LIMITED TO
ACCURACY OR COMPLETENESS, TITLE, ANY EPIDEMIC FAILURE WARRANTY AND ANY IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF ANY THIRD PARTY INTELLECTUAL
PROPERTY RIGHTS. TI SHALL NOT BE LIABLE FOR AND SHALL NOT DEFEND OR INDEMNIFY DESIGNER AGAINST ANY CLAIM,
INCLUDING BUT NOT LIMITED TO ANY INFRINGEMENT CLAIM THAT RELATES TO OR IS BASED ON ANY COMBINATION OF
PRODUCTS EVEN IF DESCRIBED IN TI RESOURCES OR OTHERWISE. IN NO EVENT SHALL TI BE LIABLE FOR ANY ACTUAL,
DIRECT, SPECIAL, COLLATERAL, INDIRECT, PUNITIVE, INCIDENTAL, CONSEQUENTIAL OR EXEMPLARY DAMAGES IN
CONNECTION WITH OR ARISING OUT OF TI RESOURCES OR USE THEREOF, AND REGARDLESS OF WHETHER TI HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Unless TI has explicitly designated an individual product as meeting the requirements of a particular industry standard (e.g., ISO/TS 16949
and ISO 26262), TI is not responsible for any failure to meet such industry standard requirements.
Where TI specifically promotes products as facilitating functional safety or as compliant with industry functional safety standards, such
products are intended to help enable customers to design and create their own applications that meet applicable functional safety standards
and requirements. Using products in an application does not by itself establish any safety features in the application. Designers must
ensure compliance with safety-related requirements and standards applicable to their applications. Designer may not use any TI products in
life-critical medical equipment unless authorized officers of the parties have executed a special contract specifically governing such use.
Life-critical medical equipment is medical equipment where failure of such equipment would cause serious bodily injury or death (e.g., life
support, pacemakers, defibrillators, heart pumps, neurostimulators, and implantables). Such equipment includes, without limitation, all
medical devices identified by the U.S. Food and Drug Administration as Class III devices and equivalent classifications outside the U.S.
TI may expressly designate certain products as completing a particular qualification (e.g., Q100, Military Grade, or Enhanced Product).
Designers agree that it has the necessary expertise to select the product with the appropriate qualification designation for their applications
and that proper product selection is at Designers’ own risk. Designers are solely responsible for compliance with all legal and regulatory
requirements in connection with such selection.
Designer will fully indemnify TI and its representatives against any damages, costs, losses, and/or liabilities arising out of Designer’s non-
compliance with the terms and provisions of this Notice.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2017, Texas Instruments Incorporated
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Texas Instruments:
LM2587EVAL LM2587S-12 LM2587S-12/NOPB LM2587S-3.3 LM2587S-3.3/NOPB LM2587S-5.0 LM2587S-
5.0/NOPB LM2587S-ADJ LM2587S-ADJ/NOPB LM2587SX-12 LM2587SX-12/NOPB LM2587SX-3.3 LM2587SX-
3.3/NOPB LM2587SX-5.0 LM2587SX-5.0/NOPB LM2587SX-ADJ LM2587SX-ADJ/NOPB LM2587T-12 LM2587T-
12/NOPB LM2587T-3.3 LM2587T-3.3/NOPB LM2587T-5.0 LM2587T-5.0/NOPB LM2587T-ADJ LM2587T-
ADJ/NOPB LM2587T-ADJ/LF03
