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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM2587

SNVS115E –APRIL 2000–REVISED JUNE 2019

LM2587 4-V To 40-V, 5-A Step-Up Wide V

Flyback Regulator

1 Features

1• Requires Few External Components

• Family of Standard Inductors and Transformers

• NPN Output Switches 5 A, Can Stand Off 65 V

• Wide Input Voltage Range: 4 V to 40 V

• Current-mode Operation for Improved Transient

Response, Line Regulation, and Current Limit

• 100-kHz Switching Frequency

• Internal Soft-Start Function Reduces In-rush

Current During Start-up

• Output Transistor Protected by Current Limit,

Undervoltage Lockout, and Thermal Shutdown

• System Output Voltage Tolerance of ±4%

Maximum Over Line and Load Conditions

• Create a Custom Design Using the LM2587 With

the WEBENCH®Power Designer

2 Typical Applications

• Flyback Regulator

• Multiple-Output Regulator

• Simple Boost Regulator

• Forward Converter

3 Description

The LM2587 series of regulators are monolithic

integrated circuits specifically designed for flyback,

step-up (boost), and forward converter applications.

The device is available in 4 different output voltage

versions: 3.3 V, 5 V, 12 V, and adjustable.

Requiring a minimum number of external

components, these regulators are cost effective, and

simple to use. Included in the datasheet are typical

circuits of boost and flyback regulators. Also listed

are selector guides for diodes and capacitors and a

family of standard inductors and flyback transformers

designed to work with these switching regulators.

The power switch is a 5-A NPN device that can

stand-off 65 V. Protecting the power switch are

current and thermal limiting circuits, and an

undervoltage lockout circuit. This IC contains a 100

kHz fixed-frequency internal oscillator that permits the

use of small magnetics. Other features include soft-

start mode to reduce in-rush current during start up,

current mode control for improved rejection of input

voltage and output load transients and cycle-by-cycle

current limiting. An output voltage tolerance of ±4%,

within specified input voltages and output load

conditions, is ensured for the power supply system.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)

LM2587 DDPAK/ TO-263 (5) 10.16 mm × 8.42 mm

TO-220 (5) 14.986 mm × 10.16 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Flyback Regulator

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Table of Contents

1 Features.................................................................. 1

2 Typical Applications.............................................. 1

3 Description............................................................. 1

4 Revision History..................................................... 2

5 Pin Configurations................................................. 3

6 Specifications......................................................... 4

6.1 Absolute Maximum Ratings ..................................... 4

6.2 ESDRatings............................................................... 4

6.3 Recommended Operating Ratings............................ 4

6.4 Thermal Information.................................................. 5

6.5 Electrical Characteristics: 3.3 V ............................... 5

6.6 Electrical Characteristics: 5 V .................................. 6

6.7 Electrical Characteristics: 12 V ................................ 6

6.8 Electrical Characteristics: Adjustable........................ 7

6.9 Electrical Characteristics: All Output Voltage Versions

...................................................................................7

6.10 Typical Characteristics............................................ 9

7 Detailed Description............................................ 12

7.1 Overview ................................................................. 12

7.2 Functional Block Diagram....................................... 13

7.3 Feature Description................................................. 14

8 Application And Implementation........................ 15

8.1 Application Information............................................ 15

8.2 Typical Applications ................................................ 15

8.3 Additional Application Examples............................. 27

9 Layout................................................................... 28

9.1 Layout Guidelines ................................................... 28

9.2 Layout Example ...................................................... 28

9.3 Heat Sink/Thermal Considerations ......................... 28

10 Device and Documentation Support ................. 31

10.1 Device Support...................................................... 31

10.2 Receiving Notification Of Documentation

Updates.................................................................... 31

10.3 Community Resources.......................................... 31

10.4 Trademarks........................................................... 31

10.5 Electrostatic Discharge Caution............................ 31

10.6 Glossary................................................................ 32

11 Mechanical, Packaging, and Orderable

Information........................................................... 32

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision D (April 2013) to Revision E Page

• Editorial changes only, no technical revisions; add links for WEBENCH .............................................................................. 1

Changes from Revision C (April 2013) to Revision D Page

• Changed layout of National Data Sheet to TI format ........................................................................................................... 30

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5 Pin Configurations

NDH Package

5-Pin TO-220

Top View, Bent Staggered Leads

KTT Package

5-Pin DDPAK/TO-263

Top View

NDH Package

5-Pin TO-220

Side View, Bent Staggered Leads

KTT Package

5-Pin DDPAK/TO-263

Side View

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(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 specified under these conditions. For specifications

and test conditions see .

(2) If Military/Aerospace specified devices are required, contact the Texas Instruments 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 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.

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(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

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.2 ESDRatings VALUE UNIT

V(ESD) Electrostatic discharge

(minimum) Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)

(C = 100 pF, R = 1.5 kΩ)2000 V

6.3 Recommended 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

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(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC package thermal metrics application

report.

(2) 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 61 and Figure 62, system performance will be as specified by the system parameters.

(3) 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.

(4) 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.

(5) 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.

(6) 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.

(7) 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 reduces thermal resistance

further. See the thermal model in Switchers Made Simple®software.

6.4 Thermal Information

THERMAL METRIC(1)(2) LM2585

UNITKTT (DDPAK/TO-263 NDH (TO-220)

5 PINS 5 PINS

RθJA Junction-to-ambient thermal resistance 56(3) 65(4)

°C/W35(5) 45(6)

26(7) —

RθJC Junction-to-case thermal resistance 2 2 °C/W

(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 61 and Figure 62, 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-MΩresistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL.

6.5 Electrical Characteristics: 3.3 V

Specifications with standard type face are for TJ= 25°C, and those in bold apply over full Operating Temperature Range.

Unless otherwise specified, VIN = 5V.

PARAMETER TEST CONDITIONS TYP MIN MAX UNIT

SYSTEM PARAMETERS Test Circuit of Figure 61(1)

VOUT Output Voltage VIN = 4V to 12V

ILOAD = 400 mA to 1.75A 3.3 3.17/3.14 3.43/3.46 V

ΔVOUT/

ΔVIN Line Regulation VIN = 4V to 12V

ILOAD = 400 mA 20 50/100 mV

ΔVOUT/

ΔILOAD Load Regulation VIN = 12V

ILOAD = 400 mA to 1.75A 20 50/100 mV

ηEfficiency VIN = 12V, ILOAD = 1A 75 %

UNIQUE DEVICE PARAMETERS (2)

VREF Output Reference

Voltage Measured at Feedback Pin

VCOMP = 1.0V 3.3 3.242/3.234 3.358/3.366 V

ΔVREF Reference Voltage

Line Regulation VIN = 4V to 40V 2.0 mV

GMError Amp

Transconductance ICOMP =−30 μA to +30 μA

VCOMP = 1.0V 1.193 0.678 2.259 mmho

AVOL Error Amp

Voltage Gain VCOMP = 0.5V to 1.6V

RCOMP = 1.0 MΩ(3) 260 151/75 V/V

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(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 61 and Figure 62, 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-MΩresistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL.

6.6 Electrical Characteristics: 5 V

Specifications with standard type face are for TJ= 25°C, and those in bold apply over full Operating Temperature Range.

Unless otherwise specified, VIN = 5V.

PARAMETER TEST CONDITIONS TYP MIN MAX UNIT

SYSTEM PARAMETERS Test Circuit of Figure 61(1)

VOUT Output Voltage VIN = 4V to 12V

ILOAD = 500 mA to 1.45A 5.0 4.80/4.75 5.20/5.25 V

ΔVOUT/

ΔVIN Line Regulation VIN = 4V to 12V

ILOAD = 500 mA 20 50/100 mV

ΔVOUT/

ΔILOAD Load Regulation VIN = 12V

ILOAD = 500 mA to 1.45A 20 50/100 mV

ηEfficiency VIN = 12V, ILOAD = 750 mA 80 %

UNIQUE DEVICE PARAMETERS (2)

VREF Output Reference

Voltage Measured at Feedback Pin

VCOMP = 1.0V 5.0 4.913/4.900 5.088/5.100 V

ΔVREF Reference Voltage

Line Regulation VIN = 4V to 40V 3.3 mV

GMError Amp

Transconductance ICOMP =−30 μA to +30 μA

VCOMP = 1.0V 0.750 0.447 1.491 mmho

AVOL Error Amp

Voltage Gain VCOMP = 0.5V to 1.6V

RCOMP = 1.0 MΩ(3) 165 99/49 V/V

(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 61 and Figure 62, 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-MΩresistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL.

6.7 Electrical Characteristics: 12 V

Specifications with standard type face are for TJ= 25°C, and those in bold apply over full Operating Temperature Range.

Unless otherwise specified, VIN = 5V.

PARAMETER TEST CONDITIONS TYP MIN MAX UNIT

SYSTEM PARAMETERS Test Circuit of Figure 62(1)

VOUT Output Voltage VIN = 4V to 10V

ILOAD = 300 mA to 1.2A 12.0 11.52/11.40 12.48/12.60 V

ΔVOUT/

ΔVIN Line Regulation VIN = 4V to 10V

ILOAD = 300 mA 20 100/200 mV

ΔVOUT/

ΔILOAD Load Regulation VIN = 10V

ILOAD = 300 mA to 1.2A 20 100/200 mV

ηEfficiency VIN = 10V, ILOAD = 1A 90 %

UNIQUE DEVICE PARAMETERS (2)

VREF Output Reference

Voltage Measured at Feedback Pin

VCOMP = 1.0V 12.0 11.79/11.76 12.21/12.24 V

ΔVREF Reference Voltage

Line Regulation VIN = 4V to 40 7.8 mV

GMError Amp

Transconductance ICOMP =−30 μA to +30 μA

VCOMP = 1.0V 0.328 0.186 0.621 mmho

AVOL Error Amp

Voltage Gain VCOMP = 0.5V to 1.6V

RCOMP = 1.0 MΩ(3) 70 41/21 V/V

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(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 61 and Figure 62, 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-MΩresistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL.

6.8 Electrical Characteristics: Adjustable

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.

PARAMETER TEST CONDITIONS TYP MIN MAX UNIT

SYSTEM PARAMETERS Test Circuit of Figure 62(1)

VOUT Output Voltage VIN = 4V to 10V

ILOAD = 300 mA to 1.2A 12.0 11.52/11.40 12.48/12.60 V

ΔVOUT/

ΔVIN Line Regulation VIN = 4V to 10V

ILOAD = 300 mA 20 100/200 mV

ΔVOUT/

ΔILOAD Load Regulation VIN = 10V

ILOAD = 300 mA to 1.2A 20 100/200 mV

ηEfficiency VIN = 10V, ILOAD = 1A 90 %

UNIQUE DEVICE PARAMETERS (2)

VREF Output Reference

Voltage Measured at Feedback Pin

VCOMP = 1.0V 1.230 1.208/1.205 1.252/1.255 V

ΔVREF Reference Voltage

Line Regulation VIN = 4V to 40V 1.5 mV

GMError Amp

Transconductance ICOMP =−30 μA to +30 μA

VCOMP = 1.0V 3.200 1.800 6.000 mmho

AVOL Error Amp

Voltage Gain VCOMP = 0.5V to 1.6V

RCOMP = 1.0 MΩ(3) 670 400/200 V/V

IBError Amp

Input Bias Current VCOMP = 1.0V 125 425/600 nA

(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 = 1.41 V; 3.3 V: VFB = 3.8 V; 5 V: VFB = 5.75 V; 12 V: VFB = 13.8 V.

(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 = 1.05 V; 3.3 V: VFB = 2.81 V; 5 V: VFB = 4.25 V; 12 V: VFB = 10.2 V.

(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).

6.9 Electrical Characteristics: All Output Voltage Versions (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.

PARAMETER TEST CONDITIONS TYP MIN MAX UNIT

ISInput Supply Current (Switch Off)

See(2) 11 15.5/16.5 mA

ISWITCH = 3.0A 85 140/165 mA

VUV Input Supply

Undervoltage Lockout RLOAD = 100Ω3.30 3.05 3.75 V

fOOscillator Frequency Measured at Switch Pin

RLOAD = 100Ω

VCOMP = 1.0V 100 85/75 115/125 kHz

fSC Short-Circuit

Frequency Measured at Switch Pin

RLOAD = 100Ω

VFEEDBACK = 1.15V 25 kHz

VEAO Error Amplifier

Output Swing Upper Limit

See(3) 2.8 2.6/2.4 V

Lower Limit

See(2) 0.25 0.40/0.55 V

IEAO Error Amp

Output Current

(Source or Sink)

See(4) 165 110/70 260/320 μA

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Electrical Characteristics: All Output Voltage Versions (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.

PARAMETER TEST CONDITIONS TYP MIN MAX UNIT

ISS Soft Start Current VFEEDBACK = 0.92V

VCOMP = 1.0V 11.0 8.0/7.0 17.0/19.0 μA

D Maximum Duty Cycle RLOAD = 100Ω

See(3) 98 93/90 %

ILSwitch Leakage

Current Switch Off

VSWITCH = 60V 15 300/600 μA

VSUS Switch Sustaining

Voltage dV/dT = 1.5V/ns 65 V

VSAT Switch Saturation

Voltage ISWITCH = 5.0A 0.7 1.1/1.4 V

ICL NPN Switch

Current Limit 6.5 5.0 9.5 A

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6.10 Typical Characteristics

Figure 1. Supply Current vs Temperature Figure 2. Reference Voltage vs Temperature

Figure 3. ΔReference Voltage vs Supply Voltage Figure 4. Supply Current vs Switch Current

Figure 5. Current Limit vs Temperature Figure 6. Feedback Pin Bias Current vs Temperature

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Typical Characteristics (continued)

Figure 7. Switch Saturation Voltage vs Temperature Figure 8. Switch Transconductance vs Temperature

Figure 9. Oscillator Frequency vs Temperature Figure 10. Error Amp Transconductance vs Temperature

Figure 11. Error Amp Voltage Gain vs Temperature Figure 12. Short Circuit Frequency vs Temperature

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Typical Characteristics (continued)

A: Switch Voltage, 10 V/div B: Switch Current, 5 A/div C: Output

Rectifier Current, 5 A/div D: Output Ripple Voltage, 100 mV/div

AC-Coupled

Horizontal: 2 μs/div

Figure 13. Switching Waveforms Figure 14. VOUT Load Current Step Response

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7 Detailed Description

7.1 Overview

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 15, or multiple output voltages. In Figure 15, 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 15): 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 1.23-V

reference. The error amp output voltage is compared to a ramp voltage proportional to the switch current (in

other words, 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.

As shown in Figure 15, 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 13. Typical Performance

Characteristics observed during the operation of this circuit are shown in Figure 14.

Figure 15. 12-V Flyback Regulator Design Example

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7.2 Functional Block Diagram

For Fixed Versions 3.3 V, R1 = 3.4 k, R2 = 2 k, 5 V, R1 = 6.15 k, R2 = 2k 12V, R1 = 8.73 k, R2 = 1 k. For Adj. Version R1 =

Short (0Ω), R2 = Open

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For Fixed Versions 3.3 V, R1 = 3.4 k, R2 = 2 k, 5 V, R1 = 6.15 k, R2 = 2k 12V, R1 = 8.73 k, R2 = 1 k. For Adj. Version R1 =

Short (0Ω), R2 = Open

7.3 Feature Description

7.3.1 Step-Up (Boost) Regulator Operation

Figure 16 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.

A brief explanation of how the LM2587 Boost Regulator works is as follows (refer to Figure 16). 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 section.

By adding a small number of external components (as shown in Figure 16), 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 . Typical performance of this regulator is shown in .

Figure 16. 12-V Boost Regulator

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8 Application And Implementation

8.1 Application Information

The LM2587 series of regulators are monolithic integrated circuits specifically designed for flyback, step-up

(boost), and forward converter applications. Requiring a minimum number of external components, these

regulators are cost effective and simple to use.

8.2 Typical Applications

8.2.1 Typical Boost Regulator Applications

Figure 18 through Figure 21 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 12-V output application, the part numbers and manufacturers' names for the inductor are listed in . For

applications with different output voltages, refer to the Switchers Made Simple software.

Figure 17. Boost Regulator

Figure 18. 5-V To 12-V Boost Regulator

Figure 19. 12-V To 24-V Boost Regulator

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Typical Applications (continued)

Figure 20. 24-V To 36-V Boost Regulator

*The LM2585 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

Figure 21. 24-V To 48-V Boost Regulator

8.2.2 Typical Flyback Regulator Applications

Figure 24 Figure 25 Figure 26 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 . 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.

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Typical Applications (continued)

Figure 22. Single-Output Flyback Regulator

Figure 23. Single-Output Flyback Regulator

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Typical Applications (continued)

Figure 24. Single-Output Flyback Regulator

Figure 25. Dual-Output Flyback Regulator

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Typical Applications (continued)

Figure 26. Dual-Output Flyback Regulator

Figure 27. Triple-Output Flyback Regulator

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Typical Applications (continued)

8.2.2.1 Transformer Selection (T)

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

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

(1) Coilcraft Inc. Phone: (800) 322-2645 www.coilcraft.com

(2) Pulse Engineering Inc. Phone: (619) 674-8100 www.digikey.com

(3) Renco Electronics Inc. Phone: (800) 645-5828 www.cdiweb.com/renco

(4) Schott Corp. Phone: (612) 475-1173 www.schottcorp.com/

Table 2. Transformer Manufacturer Guide

Transform

er Type

Manufacturers' Part Numbers

Coilcraft

(1) Coilcraft

(1)

Surface Mount

Pulse

(2)

Surface Mount

Pulse

(2) Renco

(3) Schott

(4)

T5 Q4338-B Q4437-B PE-68413 — RL-5532 67140890

T6 Q4339-B Q4438-B PE-68414 — RL-5533 67140900

T7 S6000-A S6057-A — PE-68482 RL-5751 26606

8.2.2.2 Transformer Footprints

through Figure 58 show the footprints of each transformer, listed in .

Figure 28. Coilcraft Q4434-B (Top View)

Figure 29. Coilcraft Q4337-B (Top View)

Figure 30. Coilcraft Q4343-B (Top View)

Figure 31. Coilcraft Q4344-B (Top View)

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Figure 32. Coilcraft Q4435-B (Surface Mount) (Top View) Figure 33. Coilcraft Q4436-B (Surface Mount) (Top View)

Figure 34. Pulse PE-68411 (Surface Mount) (Top View) Figure 35. Pulse PE-68412 (Surface Mount) (Top View)

Figure 36. Pulse PE-68421 (Surface Mount) (Top View)

Figure 37. Pulse PE-68422 (Surface Mount) (Top View)

Figure 38. Renco RL-5530 (Top View) Figure 39. Renco RL-5531 (Top View)

Figure 40. Renco RL-5534 (Top View)

Figure 41. Renco RL-5535 (Top View)

Figure 42. Schott 67141450 (Top View) Figure 43. Schott 67140860 (Top View)

Figure 44. Schott 67140920 (Top View)

Figure 45. Schott 67140930 (Top View)

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Figure 46. Coilcraft Q4437-B (Top View)

(Surface Mount) Figure 47. Coilcraft Q4338-B

(Top View)

Figure 48. Coilcraft S6057-A (Top View)

(Surface Mount) Figure 49. Coilcraft Q4438-B (Top View)

(Surface Mount)

Figure 50. Pulse Pe-68482 (Top View) Figure 51. Pulse Pe-68414 (Top View)

(Surface Mount)

Figure 52. Pulse Pe-68413 (Top View)

(Surface Mount) Figure 53. Renco Rl-5751 (Top View)

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Figure 54. Renco Rl-5533

(Top View)

Figure 55. Renco Rl-5532 (Top View)

Figure 56. Schott 26606 (Top View) Figure 57. Schott 67140900 (Top View)

Figure 58. Schott 67140890

(Top View)

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(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

8.2.3 Design Requirements

Table 3 contains a table of standard inductors, by part number and corresponding manufacturer, for the fixed

output regulator of Figure 18.

Table 3. Inductor Selection Table

Coilcraft (1) Pulse (2) Renco(3) Schott(4)

R4793-A PE-53900 RL-5472-5 67146520

8.2.4 Detailed Design Procedure

8.2.4.1 Custom Design With Webench® Tools

Click here to create a custom design using the LM2587 device with the WEBENCH® Power Designer.

1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.

2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.

3. Compare the generated design with other possible solutions from Texas Instruments.

The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time

pricing and component availability.

In most cases, these actions are available:

• Run electrical simulations to see important waveforms and circuit performance

• Run thermal simulations to understand board thermal performance

• Export customized schematic and layout into popular CAD formats

• Print PDF reports for the design, and share the design with colleagues

Get more information about WEBENCH tools at www.ti.com/WEBENCH.

8.2.4.2 Programming Output Voltage (Selecting R1And R2)

Referring to the adjustable regulator in Figure 17, 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.

8.2.4.3 Short Circuit Condition

Due to the inherent nature of boost regulators, when the output is shorted (see Figure 17), 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 59), 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.

LM2587

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8.2.4.4 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 59). 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 59. 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.

8.2.4.5 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 13, 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 59 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 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 59. 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.

LM2587

SNVS115E –APRIL 2000–REVISED JUNE 2019

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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 59. 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 60. Input Line Filter

8.2.4.6 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).

8.2.4.7 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 60 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).

8.2.4.8 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:

where

• VSAT is the switch saturation voltage and can be found in the Characteristic Curves. (6)

LM2587

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8.3 Additional Application Examples

8.3.1 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 61. 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 62. LM2587-12 and LM2587-ADJ Test Circuit

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Product Folder Links: LM2587

9 Layout

9.1 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 63).

When using the adjustable version, physically locate the programming resistors as near the regulator IC as

possible, to keep the sensitive feedback wiring short.

9.2 Layout Example

Figure 63. Circuit Board Layout

9.3 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:

LM2587

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Heat Sink/Thermal Considerations (continued)

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:

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. (8)

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

LM2587

SNVS115E –APRIL 2000–REVISED JUNE 2019

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Product Folder Links: LM2587

Heat Sink/Thermal Considerations (continued)

9.3.1 European Magnetic Vendor

Contacts

Please contact the following addresses for details of local distributors or representatives:

9.3.2 Coilcraft

21 Napier Place

Wardpark North Cumbernauld, Scotland G68 0LL Phone: +44 1236 730 595 Fax: +44 1236 730 627

9.3.3 Pulse Engineering

Dunmore Road

Tuam Co. Galway, Ireland Phone: +353 93 24 107 Fax: +353 93 24 459

LM2587

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SNVS115E –APRIL 2000–REVISED JUNE 2019

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10 Device and Documentation Support

10.1 Device Support

10.1.1 Third-Party Products Disclaimer

TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT

CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES

OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER

ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE.

10.1.2 Development Support

10.1.2.1 Custom Design With Webench® Tools

Click here to create a custom design using the LM2587 device with the WEBENCH® Power Designer.

1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.

2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.

3. Compare the generated design with other possible solutions from Texas Instruments.

The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time

pricing and component availability.

In most cases, these actions are available:

• Run electrical simulations to see important waveforms and circuit performance

• Run thermal simulations to understand board thermal performance

• Export customized schematic and layout into popular CAD formats

• Print PDF reports for the design, and share the design with colleagues

Get more information about WEBENCH tools at www.ti.com/WEBENCH.

10.2 Receiving Notification Of Documentation Updates

To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper

right corner, click on Alert me to register and receive a weekly digest of any product information that has

changed. For change details, review the revision history included in any revised document.

10.3 Community Resources

The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective

contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of

Use.

TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration

among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help

solve problems with fellow engineers.

Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and

contact information for technical support.

10.4 Trademarks

E2E is a trademark of Texas Instruments.

WEBENCH, Switchers Made Simple are registered trademarks of Texas Instruments.

All other trademarks are the property of their respective owners.

10.5 Electrostatic Discharge Caution

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more

susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

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10.6 Glossary

SLYZ022 —TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.

11 Mechanical, Packaging, and Orderable Information

The following pages include mechanical, packaging, and orderable information. This information is the most

current data available for the designated devices. This data is subject to change without notice and revision of

this document. For browser-based versions of this data sheet, refer to the left-hand navigation.

PACKAGE OPTION ADDENDUM

www.ti.com 9-Jun-2020

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 Green (RoHS

& no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2587S

-12 P+

LM2587S-3.3/NOPB ACTIVE DDPAK/

TO-263 KTT 5 45 Green (RoHS

& no Sb/Br) 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 Green (RoHS

& no Sb/Br) 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 Green (RoHS

& no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2587S

-ADJ P+

LM2587SX-12/NOPB ACTIVE DDPAK/

TO-263 KTT 5 500 Green (RoHS

& no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2587S

-12 P+

LM2587SX-5.0/NOPB ACTIVE DDPAK/

TO-263 KTT 5 500 Green (RoHS

& no Sb/Br) 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 Green (RoHS

& no Sb/Br) SN Level-3-245C-168 HR -40 to 125 LM2587S

-ADJ P+

LM2587T-12/NOPB ACTIVE TO-220 NDH 5 45 Green (RoHS

& no Sb/Br) SN Level-1-NA-UNLIM -40 to 125 LM2587T

-12 P+

LM2587T-3.3/NOPB ACTIVE TO-220 NDH 5 45 Green (RoHS

& no Sb/Br) SN Level-1-NA-UNLIM -40 to 125 LM2587T

-3.3 P+

LM2587T-5.0/NOPB ACTIVE TO-220 NDH 5 45 Green (RoHS

& no Sb/Br) 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 Green (RoHS

& no Sb/Br) 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 9-Jun-2020

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) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance

do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may

reference these types of products as "Pb-Free".

RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.

Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based

flame retardants must also meet the <=1000ppm threshold requirement.

(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)

(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 29-Sep-2019

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 29-Sep-2019

Pack Materials-Page 2

MECHANICAL DATA

NDH0005D

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MECHANICAL DATA

KTT0005B

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BOTTOM SIDE OF PACKAGE

TS5B (Rev D)

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