LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 LM2588 SIMPLE SWITCHER(R) 5A Flyback Regulator with Shutdown Check for Samples: LM2588 FEATURES DESCRIPTION * Requires Few External Components * Family of Standard Inductors and Transformers * NPN Output Switches 5.0A, Can Stand Off 65V * Wide Input Voltage Range: 4V to 40V * Adjustable Switching Frequency: 100 kHz to 200 kHz * External Shutdown Capability * Draws Less Than 60 A When Shut Down * Frequency Synchronization * Current-mode Operation for Improved Transient Response, Line Regulation, and Current Limit * Internal Soft-start Function Reduces In-rush Current During Start-up * Output Transistor Protected by Current Limit, Under Voltage Lockout, and Thermal Shutdown * System Output Voltage Tolerance of 4% Max Over Line and Load Conditions The LM2588 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: 3.3V, 5.0V, 12V, and adjustable. 1 2345 TYPICAL APPLICATIONS * * * * Flyback Regulator Forward Converter Multiple-output Regulator Simple Boost Regulator 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 5.0A NPN device that can stand-off 65V. Protecting the power switch are current and thermal limiting circuits, and an undervoltage lockout circuit. This IC contains an adjustable frequency oscillator that can be programmed up to 200 kHz. The oscillator can also be synchronized with other devices, so that multiple devices can operate at the same switching frequency. Other features include soft start mode to reduce inrush current during start up, and current mode control for improved rejection of input voltage and output load transients and cycle-by-cycle current limiting. The device also has a shutdown pin, so that it can be turned off externally. An output voltage tolerance of 4%, within specified input voltages and output load conditions, is ensured for the power supply system. Connection Diagrams 7-Pin Top View Bent, 7-Pin Side View Figure 1. LM2588T-12 or LM2588T-ADJ See Package Number NDZ0007B 1 2 3 4 5 Please 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. Switchers Made Simple is a trademark of Texas Instruments. SIMPLE SWITCHER is a registered trademark of Texas Instruments. Switchers Made Simple is a registered trademark of dcl_owner. All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright (c) 1998-2013, Texas Instruments Incorporated LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com 7-Pin Top View 7-Pin Side View Figure 2. LM2588S-12 or LM2588S-ADJ See Package Number KTW0007B 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. 2 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 Absolute Maximum Ratings (1) (2) -0.4V VIN 45V Input Voltage -0.4V VSW 65V Switch Voltage Switch Current (3) Internally Limited Compensation Pin Voltage -0.4V VCOMP 2.4V Feedback Pin Voltage -0.4V VFB 2 VOUT -0.4V VSH 6V ON /OFF Pin Voltage -0.4V VSYNC 2V Sync Pin Voltage Power Dissipation (4) Internally Limited Storage Temperature Range -65C to +150C Lead Temperature Maximum Junction Temperature (Soldering, 10 sec.) Minimum ESD Rating (1) (2) (3) (4) 260C (4) 150C (C = 100 pF, R = 1.5 k) 2 kV Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. These ratings apply when the current is limited to less than 1.2 mA for pins 1, 2, 3, and 6. Operating ratings indicate conditions for which 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. If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications. Note that switch current and output current are not identical in a step-up regulator. Output current cannot be internally limited when the LM2588 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 LM2588 is used as a flyback regulator (see the Application Hints section for more information). The junction temperature of the device (TJ) is a function of the ambient temperature (TA), the junction-to-ambient thermal resistance (JA), 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 x JA + 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)]/JA. When calculating the maximum allowable power dissipation, derate the maximum junction temperature--this ensures a margin of safety in the thermal design. Operating Ratings 4V VIN 40V Supply Voltage 0V VSW 60V Output Switch Voltage ISW 5.0A Output Switch Current -40C TJ +125C Junction Temperature Range Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 3 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com LM2588-3.3 Electrical Characteristics Specifications with standard type face are for TJ = 25C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions Typical Min Max Units 3.17/3.14 3.43/3.46 V SYSTEM PARAMETERS Test Circuit of Figure 18 (1) VOUT Output Voltage VIN = 4V to 12V ILOAD = 400 mA to 1.75A 3.3 VOUT/ VIN Line Regulation VIN = 4V to 12V ILOAD = 400 mA 20 50/100 mV VOUT/ ILOAD Load Regulation VIN = 12V ILOAD = 400 mA to 1.75A 20 50/100 mV Efficiency VIN = 12V, ILOAD = 1A 75 Measured at Feedback Pin VCOMP = 1.0V 3.3 UNIQUE DEVICE PARAMETERS VREF Output Reference Voltage VREF Reference Voltage Line VIN = 4V to 40V Regulation GM Error Amp Transconductance ICOMP = -30 A to +30 A VCOMP = 1.0V AVOL Error Amp Voltage Gain VCOMP = 0.5V to 1.6V RCOMP = 1.0 M (3) (1) (2) (3) 4 % (2) 3.242/3.234 3.358/3.366 2.0 V mV 1.193 0.678 260 151/75 2.259 mmho V/V External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM2588 is used as shown in Figure 18 and Figure 19, system performance will be as specified by the system parameters. 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. A 1.0 M resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 LM2588-5.0 Electrical Characteristics Specifications with standard type face are for TJ = 25C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions Typical Min Max Units 4.80/4.75 5.20/5.25 V SYSTEM PARAMETERS Test Circuit of Figure 18 (1) VOUT Output Voltage VIN = 4V to 12V ILOAD = 500 mA to 1.45A 5.0 VOUT/ VIN Line Regulation VIN = 4V to 12V ILOAD = 500 mA 20 50/100 mV VOUT/ ILOAD Load Regulation VIN = 12V ILOAD = 500 mA to 1.45A 20 50/100 mV Efficiency VIN = 12V, ILOAD = 750 mA 80 Measured at Feedback Pin VCOMP = 1.0V 5.0 UNIQUE DEVICE PARAMETERS VREF Output Reference Voltage VREF Reference Voltage Line VIN = 4V to 40V Regulation GM Error Amp Transconductance ICOMP = -30 A to +30 A VCOMP = 1.0V AVOL Error Amp Voltage Gain VCOMP = 0.5V to 1.6V RCOMP = 1.0 M (3) (1) (2) (3) % (2) 4.913/4.900 5.088/5.100 V 3.3 mV 0.750 0.447 165 99/49 1.491 mmho V/V External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM2588 is used as shown in Figure 18 and Figure 19, system performance will be as specified by the system parameters. 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. A 1.0 M resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 5 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com LM2588-12 Electrical Characteristics Specifications with standard type face are for TJ = 25C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions Typical Min Max Units 12.0 11.52/11.40 12.48/12.60 V 20 100/200 mV 20 100/200 mV SYSTEM PARAMETERS Test Circuit of Figure 19 (1) VOUT Output Voltage VIN = 4V to 10V ILOAD = 300 mA to 1.2A VOUT/ VIN Line Regulation VOUT/ ILOAD Load Regulation Efficiency ILOAD = 300 mA VIN = 10V ILOAD = 300 mA to 1.2A UNIQUE DEVICE PARAMETERS VREF VIN = 4V to 10V Output Reference Voltage VIN = 10V, ILOAD = 1A Measured at Feedback Pin Reference Voltage Line VIN = 4V to 40V Regulation GM Error Amp Transconductance ICOMP = -30 A to +30 A Error Amp Voltage Gain VCOMP = 0.5V to 1.6V (1) (2) (3) 6 % 12.0 11.79/11.76 12.21/12.24 V VCOMP = 1.0V VREF AVOL 90 (2) 7.8 mV 0.328 0.186 70 41/21 0.621 mmho VCOMP = 1.0V V/V RCOMP = 1.0 M (3) External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM2588 is used as shown in Figure 18 and Figure 19, system performance will be as specified by the system parameters. 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. A 1.0 M resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 LM2588-ADJ Electrical Characteristics Specifications with standard type face are for TJ = 25C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions Typical Min Max Units 12.0 11.52/11.40 12.48/12.60 V SYSTEM PARAMETERS Test Circuit of Figure 19 (1) VOUT Output Voltage VIN = 4V to 10V ILOAD = 300 mA to 1.2A VOUT/ VIN Line Regulation VIN = 4V to 10V ILOAD = 300 mA 20 100/200 mV VOUT/ ILOAD Load Regulation VIN = 10V ILOAD = 300 mA to 1.2A 20 100/200 mV Efficiency VIN = 10V, ILOAD = 1A 90 UNIQUE DEVICE PARAMETERS VREF Output Reference Voltage VREF Reference Voltage Line VIN = 4V to 40V Regulation GM Error Amp Transconductance ICOMP = -30 A to +30 A VCOMP = 1.0V AVOL Error Amp Voltage Gain IB Error Amp Input Bias Current (1) % (2) Measured at Feedback Pin VCOMP = 1.0V 1.230 1.208/1.205 1.252/1.255 V 1.5 mV 3.200 1.800 VCOMP = 0.5V to 1.6V RCOMP = 1.0 M (3) 670 400/200 VCOMP = 1.0V 125 6.000 mmho V/V 425/600 nA External components such as the diode, inductor, input and output capacitors can affect switching regulator performance. When the LM2588 is used as shown in Figure 18 and Figure 19, system performance will be as specified by the system parameters. 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. A 1.0 M resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL. (2) (3) All Output Voltage Versions Electrical Characteristics (1) Specifications with standard type face are for TJ = 25C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol IS Parameters Input Supply Current Max Units Switch Off (2) Conditions Typical 11 Min 15.5/16.5 mA ISWITCH = 3.0A 85 140/165 mA 16 100/300 A IS/D Shutdown Input Supply Current VSH = 3V VUV Input Supply Undervoltage Lockout RLOAD = 100 3.30 3.05 3.75 V fO Oscillator Frequency Measured at Switch Pin RLOAD = 100, VCOMP = 1.0V Freq. Adj. Pin Open (Pin 1) 100 85/75 115/125 kHz RSET = 22 k 200 kHz 25 kHz fSC Short-Circuit Frequency Measured at Switch Pin RLOAD = 100 VFEEDBACK = 1.15V VEAO Error Amplifier Output Swing (1) (2) (3) Upper Limit (3) 2.8 Lower Limit (2) 0.25 2.6/2.4 V 0.40/0.55 V 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. 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 and the switch off. 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 and the switch on. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 7 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com All Output Voltage Versions Electrical Characteristics(1) (continued) Specifications with standard type face are for TJ = 25C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Typical Min Max Units IEAO Symbol Error Amp Output Current (Source or Sink) Parameters See (4) Conditions 165 110/70 260/320 A ISS Soft Start Current VFEEDBACK = 0.92V VCOMP = 1.0V 11.0 8.0/7.0 17.0/19.0 A DMAX Maximum Duty Cycle RLOAD = 100 (3) 98 93/90 IL Switch Leakage Current Switch Off VSWITCH = 60V 15 VSUS Switch Sustaining Voltage dV/dT = 1.5V/ns VSAT Switch Saturation Voltage ISWITCH = 5.0A ICL NPN Switch Current Limit VSTH Synchronization Threshold Voltage ISYNC Synchronization Pin Current 300/600 65 0.7 A V 1.1/1.4 V 6.5 5.0 9.5 A FSYNC = 200 kHz VCOMP = 1V, VIN = 5V 0.75 0.625/0.40 0.875/1.00 V VIN = 5V VCOMP = 1V, VSYNC = VSTH 100 200 A VSHTH ON /OFF Pin (Pin 1) Threshold Voltage VCOMP = 1V ISH ON /OFF Pin (Pin 1) Current JA JA JC Thermal Resistance JA JA JA JC % (5) 1.6 1.0/0.8 2.2/2.4 V VCOMP = 1V VSH = VSHTH 40 15/10 65/75 A NDZ Package, Junction to Ambient (6) NDZ Package, Junction to Ambient (7) NDZ Package, Junction to Case 65 45 2 KTW Package, Junction to Ambient (8) KTW Package, Junction to Ambient (9) KTW Package, Junction to Ambient (10) KTW Package, Junction to Case 56 35 26 2 C/W (4) To measure the worst-case error amplifier output current, the LM2588 is tested with the feedback voltage set to its low value (specified in Note 3 under the All Output Voltage Versions Electrical Characteristics() table) and at its high value (specified in Note 2 under the All Output Voltage Versions Electrical Characteristics() table). (5) When testing the minimum value, do not sink current from this pin--isolate it with a diode. If current is drawn from this pin, the frequency adjust circuit will begin operation (see Figure 54). (6) Junction to ambient thermal resistance (no external heat sink) for the 7 lead TO-220 package mounted vertically, with 1/2 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 7 lead TO-220 package mounted vertically, with 1/2 inch leads soldered to a PC board containing approximately 4 square inches of (1 oz.) copper area surrounding the leads. (8) Junction to ambient thermal resistance for the 7 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 resistance01242001 for the 7 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 7 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(R) software. 8 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 Typical Performance Characteristics Supply Current vs Temperature Reference Voltage vs Temperature Figure 3. Figure 4. Reference Voltage vs Supply Voltage Supply Current vs Switch Current Figure 5. Figure 6. Current Limit vs Temperature Feedback Pin Bias Current vs Temperature Figure 7. Figure 8. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 9 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 10 Switch Saturation Voltage vs Temperature Switch Transconductance vs Temperature Figure 9. Figure 10. Oscillator Frequency vs Temperature Error Amp Transconductance vs Temperature Figure 11. Figure 12. Error Amp Voltage Gain vs Temperature Short Circuit Frequency vs Temperature Figure 13. Figure 14. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 Typical Performance Characteristics (continued) Shutdown Supply Current vs Temperature ON /OFF Pin Current vs Voltage Figure 15. Figure 16. Oscillator Frequency vs Resistance Figure 17. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 11 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com Flyback Regulator Test Circuits CIN1--100 F, 25V Aluminum ElectrolyticCIN2--0.1 F CeramicT--22 H, 1:1 Schott #67141450D--1N5820COUT--680 F, 16V Aluminum ElectrolyticCC--0.47 F CeramicRC--2k Figure 18. LM2588-3.3 and LM2588-5.0 12 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 CIN1--100 F, 25V Aluminum ElectrolyticCIN2--0.1 F CeramicL--15 H, Renco #RL-5472-5D--1N5820COUT--680 F, 16V Aluminum ElectrolyticCC--0.47 F CeramicRC--2kFor 12V Devices: R1 = Short (0) andR2 = OpenFor ADJ Devices: R1 = 48.75k, 0.1% andR2 = 5.62k, 0.1% Figure 19. LM2588-12 and LM2588-ADJ Block Diagram For Fixed Versions 3.3V, R1 = 3.4k, R2 = 2k5.0V, R1 = 6.15k, R2 = 2k12V, R1 = 8.73k, R2 = 1kFor Adj. VersionR1 = Short (0), R2 = Open Flyback Regulator Operation The LM2588 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 20, or multiple output voltages. In Figure 20, 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. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 13 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com The operation of a flyback regulator is as follows (refer to Figure 20): 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. As shown in Figure 20, the LM2588 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 21. Typical Performance Characteristics observed during the operation of this circuit are shown in Figure 22. Figure 20. 12V Flyback Regulator Design Example 14 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 Typical Performance Characteristics A: Switch Voltage, 10V/div B: Switch Current, 5A/div C: Output Rectifier Current, 5A/div D: Output Ripple Voltage, 100 mV/div AC-Coupled Figure 21. Switching Waveforms Figure 22. VOUT Response to Load Current Step Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 15 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com Typical Flyback Regulator Applications Figure 23 through 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 Table 1. For applications with different output voltages--requiring the LM2588-ADJ--or different output configurations that do not match the standard configurations, refer to the Switchers Made SimpleTM software. Figure 23. Single-Output Flyback Regulator Figure 24. Single-Output Flyback Regulator 16 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 Figure 25. Single-Output Flyback Regulator Figure 26. Dual-Output Flyback Regulator Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 17 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com Figure 27. Dual-Output Flyback Regulator Figure 28. 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. 18 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 Table 1. Transformer Selection Table Applications Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Transformers T1 T1 T1 T2 T3 T4 18V-36V VIN 4V-6V 4V-6V 8V-16V 4V-6V 18V-36V VOUT1 3.3V 5V 12V 12V 12V 5V IOUT1 (Max) 1.8A 1.4A 1.2A 0.3A 1A 2.5A 1 1 1 2.5 0.8 0.35 VOUT2 -12V -12V 12V IOUT2 (Max) 0.3A 1A 0.5A 2.5 0.8 0.8 N1 N2 VOUT3 -12V IOUT3 (Max) 0.5A N3 0.8 Table 2. Transformer Manufacturer Guide Transformer Type (1) (2) (3) (4) Manufacturers' Part Numbers Coilcraft (1) Coilcraft Surface Mount (1) Pulse Surface Mount (2) Renco (3) Schott (4) 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 T4 Q4344-B -- PE-68422 RL-5535 67140930 Coilcraft Inc.,: Phone: (800) 322-26451102 Silver Lake Road, Cary, IL 60013: Fax: (708) 639-1469European Headquarters, 21 Napier Place: Phone: +44 1236 730 595Wardpark North, Cumbernauld, Scotland G68 0LL: Fax: +44 1236 730 627 Pulse Engineering Inc.,: Phone: (619) 674-810012220 World Trade Drive, San Diego, CA 92128: Fax: (619) 674-8262European Headquarters, Dunmore Road: Phone: +353 93 24 107Tuam, Co. Galway, Ireland: Fax: +353 93 24 459 Renco Electronics Inc.,: Phone: (800) 645-582860 Jeffryn Blvd. East, Deer Park, NY 11729: Fax: (516) 586-5562 Schott Corp.,: Phone: (612) 475-11731000 Parkers Lane Road, Wayzata, MN 55391: Fax: (612) 475-1786 TRANSFORMER FOOTPRINTS Figure 29 through Figure 46 show the footprints of each transformer, listed in Table 2. Figure 29. T1 - Top View Coilcraft Q4434-B Figure 30. T2 - Top View Coilcraft Q4337-B Figure 31. T3 - Top View Coilcraft Q4343-B Figure 32. T4 - Top View Coilcraft Q4344-B Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 19 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 20 www.ti.com Figure 33. T1 - Top View Coilcraft Q4435-B (Surface Mount) Figure 34. T2 - Top View Coilcraft Q4436-B (Surface Mount) Figure 35. T1 - Top View Pulse PE-68411 (Surface Mount) Figure 36. T2 - Top View Pulse PE-68412 (Surface Mount) Figure 37. T3 - Top View Pulse PE-68421 (Surface Mount) Figure 38. T4 - Top View Pulse PE-68422 (Surface Mount) Figure 39. T1 - Top View Renco RL-5530 Figure 40. T2 - Top View Renco RL-5531 Figure 41. T3 - Top View Renco RL-5534 Figure 42. T4 - Top View Renco RL-5535 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 Figure 43. T1 - Top View Schott 67141450 Figure 44. T2 - Top View Schott 67140860 Figure 45. T3 - Top View Schott 67140920 Figure 46. T4 - Top View Schott 67140930 Step-Up (Boost) Regulator Operation Figure 47 shows the LM2588 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 LM2588 Boost Regulator works is as follows (refer to Figure 47). 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 section. Figure 47. 12V Boost Regulator By adding a small number of external components (as shown in Figure 47), the LM2588 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 48. Typical performance of this regulator is shown in Figure 49. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 21 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com Typical Performance Characteristics A: Switch Voltage,10V/div B: Switch Current, 5A/div C: Inductor Current, 5A/div D: Output Ripple Voltage, 100 mV/div, AC-Coupled Figure 48. Switching Waveforms Figure 49. VOUT Response to Load Current Step 22 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 TYPICAL BOOST REGULATOR APPLICATIONS Figure 50 and Figure 51 through Figure 53 show four typical boost applications--one fixed and three using the adjustable version of the LM2588. 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 Table 3. For applications with different output voltages, refer to the Switchers Made SimpleTMsoftware. Figure 50. +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 50. Table 3. Inductor Selection Table Coilcraft (1) Pulse R4793-A (1) (2) (3) (4) (2) PE-53900 Renco (3) RL-5472-5 Schott (4) 67146520 Coilcraft Inc.,: Phone: (800) 322-26451102 Silver Lake Road, Cary, IL 60013: Fax: (708) 639-1469European Headquarters, 21 Napier Place: Phone: +44 1236 730 595Wardpark North, Cumbernauld, Scotland G68 0LL: Fax: +44 1236 730 627 Pulse Engineering Inc.,: Phone: (619) 674-810012220 World Trade Drive, San Diego, CA 92128: Fax: (619) 674-8262European Headquarters, Dunmore Road: Phone: +353 93 24 107Tuam, Co. Galway, Ireland: Fax: +353 93 24 459 Renco Electronics Inc.,: Phone: (800) 645-582860 Jeffryn Blvd. East, Deer Park, NY 11729: Fax: (516) 586-5562 Schott Corp.,: Phone: (612) 475-11731000 Parkers Lane Road, Wayzata, MN 55391: Fax: (612) 475-1786 Figure 51. +12V to +24V Boost Regulator Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 23 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com Figure 52. +24V to +36V Boost Regulator *The LM2588 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 the Application Hints. Figure 53. +24V to +48V Boost Regulator Application Hints LM2588 SPECIAL FEATURES Figure 54. Shutdown Operation SHUTDOWN CONTROL A feature of the LM2588 is its ability to be shut down using the ON /OFF pin (pin 1). This feature conserves input power by turning off the device when it is not in use. For proper operation, an isolation diode is required (as shown in Figure 54). 24 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 The device will shut down when 3V or greater is applied on the ON /OFF pin, sourcing current into pin 1. In shut down mode, the device will draw typically 56 A of supply current (16 A to VIN and 40 A to the ON /OFF pin). To turn the device back on, leave pin 1 floating, using an (isolation) diode, as shown in Figure 54 (for normal operation, do not source or sink current to or from this pin--see the next section). FREQUENCY ADJUSTMENT The switching frequency of the LM2588 can be adjusted with the use of an external resistor. This feature allows the user to optimize the size of the magnetics and the output capacitor(s) by tailoring the operating frequency. A resistor connected from pin 1 (the Freq. Adj. pin) to ground will set the switching frequency from 100 kHz to 200 kHz (maximum). As shown in Figure 54, the pin can be used to adjust the frequency while still providing the shut down function. A curve in the Performance Characteristics Section graphs the resistor value to the corresponding switching frequency. The table in Table 4 shows resistor values corresponding to commonly used frequencies. However, changing the LM2588's operating frequency from its nominal value of 100 kHz will change the magnetics selection and compensation component values. Table 4. Frequency Setting Resistor Guide RSET(k) Frequency (kHz) Open 100 200 125 47 150 33 175 22 200 Figure 55. Frequency Synchronization FREQUENCY SYNCHRONIZATION Another feature of the LM2588 is the ability to synchronize the switching frequency to an external source, using the sync pin (pin 6). This feature allows the user to parallel multiple devices to deliver more output power. A negative falling pulse applied to the sync pin will synchronize the LM2588 to an external oscillator (see Figure 55 and Figure 56). Use of this feature enables the LM2588 to be synchronized to an external oscillator, such as a system clock. This operation allows multiple power supplies to operate at the same frequency, thus eliminating frequency-related noise problems. Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 25 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com Figure 56. Waveforms of a Synchronized 12V Boost Regulator The scope photo in Figure 56 shows a LM2588 12V Boost Regulator synchronized to a 200 kHz signal. There is a 700 ns delay between the falling edge of the sync signal and the turning on of the switch. PROGRAMMING OUTPUT VOLTAGE (SELECTING R1 AND R2) Referring to the adjustable regulator in Figure 57, the output voltage is programmed by the resistors R1 and R2 by the following formula: VOUT = VREF (1 + R1/R2) where VREF = 1.23V (1) Resistors R1 and R2 divide the output voltage down so that it can be compared with the 1.23V internal reference. With R2 between 1k and 5k, R1 is: 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 57 ), 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 58 ), using the standard transformers, the LM2588 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. 26 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 Figure 57. Boost Regulator Figure 58. Flyback Regulator 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 58). Both are required due to the inherent operation of a flyback regulator. To keep a stable or constant voltage supply to the LM2588, a storage capacitor (100 F) 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 for the input capacitor. The storage capacitor will also attenuate noise which may interfere with other circuits connected to the same input supply voltage. 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 F 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) Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 27 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com where VF is the forward biased voltage of the output diode, and is typically 0.5V for Schottky diodes and 0.8V for ultra-fast recovery diodes. In certain circuits, there exists a voltage spike, VLL, superimposed on top of the steady-state voltage (see Figure 21, 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 in Figure 20 and other flyback regulator circuits throughout the datasheet). The schematic in Figure 58 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 5). 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 LM2588 IC as well. When used in a flyback regulator, the voltage at the Switch pin (pin 5) 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 58. 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 10 and 1 k, and the capacitor will vary from 0.001 F to 0.1 F. Adding a snubber will (slightly) reduce the efficiency of the overall circuit. The other method to reduce or eliminate the "ringing" is to insert a Schottky diode clamp between pins 5 and 4 (ground), also shown in Figure 58. This prevents the voltage at pin 5 from dropping below -0.4V. The reverse voltage rating of the diode must be greater than the switch off voltage. Figure 59. 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 x VIN x 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 LM2588 switch, the output diode(s), and the transformer--such as reverse recovery time of the output diode (mentioned above). 28 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 NOISY INPUT LINE CONDITION A small, low-pass RC filter should be used at the input pin of the LM2588 if the input voltage has an unusually large amount of transient noise, such as with an input switch that bounces. The circuit in Figure 59 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 H and rated at 200 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. Figure 60. 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 60). 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, a heat sink is not required to keep the LM2588 junction temperature within the allowed operating temperature 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 (125C for the LM2588). For a safe, conservative design, a temperature approximately 15C cooler than the maximum junction temperature should be selected (110C). 4) LM2588 package thermal resistances JA and JC (given in the Electrical Characteristics). Total power dissipated (PD) by the LM2588 can be estimated as follows: Boost: Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 29 LM2588 SNVS117D - APRIL 1998 - REVISED APRIL 2013 www.ti.com (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: (8) where VF is 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: TJ = PD * JA. (9) Adding the junction temperature rise to the maximum ambient temperature gives the actual operating junction temperature: TJ = TJ + 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: TJ = PD * (JC + Interface + Heat Sink) (11) Again, the operating junction temperature will be: TJ = TJ + 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 SimpleTM 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, Texas Instruments is making available computer design software Switchers Made SimpleTM. Software is available on a (31/2) diskette for IBM compatible computers from a Texas Instruments sales office in your area or the Texas Instruments Customer Response Center (1-800-272-9959). 30 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 LM2588 www.ti.com SNVS117D - APRIL 1998 - REVISED APRIL 2013 REVISION HISTORY Changes from Revision C (April 2013) to Revision D * Page Changed layout of National Data Sheet to TI format .......................................................................................................... 30 Submit Documentation Feedback Copyright (c) 1998-2013, Texas Instruments Incorporated Product Folder Links: LM2588 31 PACKAGE OPTION ADDENDUM www.ti.com 17-Mar-2017 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (C) Device Marking (4/5) LM2588S-12/NOPB ACTIVE DDPAK/ TO-263 KTW 7 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2588S -12 P+ LM2588S-3.3/NOPB ACTIVE DDPAK/ TO-263 KTW 7 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2588S -3.3 P+ LM2588S-5.0/NOPB ACTIVE DDPAK/ TO-263 KTW 7 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2588S -5.0 P+ LM2588S-ADJ NRND DDPAK/ TO-263 KTW 7 45 TBD Call TI Call TI -40 to 125 LM2588S -ADJ P+ LM2588S-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTW 7 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2588S -ADJ P+ LM2588SX-12/NOPB ACTIVE DDPAK/ TO-263 KTW 7 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2588S -12 P+ LM2588SX-3.3/NOPB ACTIVE DDPAK/ TO-263 KTW 7 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2588S -3.3 P+ LM2588SX-5.0/NOPB ACTIVE DDPAK/ TO-263 KTW 7 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2588S -5.0 P+ LM2588SX-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTW 7 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2588S -ADJ P+ LM2588T-3.3/NOPB ACTIVE TO-220 NDZ 7 45 Pb-Free (RoHS Exempt) CU SN Level-1-NA-UNLIM -40 to 125 LM2588T -3.3 P+ LM2588T-5.0/NOPB ACTIVE TO-220 NDZ 7 45 Pb-Free (RoHS Exempt) CU SN Level-1-NA-UNLIM -40 to 125 LM2588T -5.0 P+ LM2588T-ADJ NRND TO-220 NDZ 7 45 TBD Call TI Call TI -40 to 125 LM2588T -ADJ P+ LM2588T-ADJ/NOPB ACTIVE TO-220 NDZ 7 45 Pb-Free (RoHS Exempt) CU SN Level-1-NA-UNLIM -40 to 125 LM2588T -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. 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. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 17-Mar-2017 (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. 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Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 2-Sep-2015 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM2588SX-12/NOPB DDPAK/ TO-263 KTW 7 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2588SX-3.3/NOPB DDPAK/ TO-263 KTW 7 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2588SX-5.0/NOPB DDPAK/ TO-263 KTW 7 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2588SX-ADJ/NOPB DDPAK/ TO-263 KTW 7 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 2-Sep-2015 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2588SX-12/NOPB DDPAK/TO-263 KTW 7 500 367.0 367.0 45.0 LM2588SX-3.3/NOPB DDPAK/TO-263 KTW 7 500 367.0 367.0 45.0 LM2588SX-5.0/NOPB DDPAK/TO-263 KTW 7 500 367.0 367.0 45.0 LM2588SX-ADJ/NOPB DDPAK/TO-263 KTW 7 500 367.0 367.0 45.0 Pack Materials-Page 2 MECHANICAL DATA KTW0007B TS7B (Rev E) BOTTOM SIDE OF PACKAGE www.ti.com MECHANICAL DATA NDZ0007B TA07B (Rev E) www.ti.com 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. 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