LM2587S-12

LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 LM2587 SIMPLE SWITCHER® 5A Flyback Regulator Check for Samples: LM2587 FEATURES 1 • • • • • 23 • • 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 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, under voltage lockout, and thermal shutdown System Output Voltage Tolerance of ±4% max over line and load conditions TYPICAL APPLICATIONS • • • • Flyback regulator Multiple-output regulator Simple boost regulator Forward converter 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: 3.3V, 5.0V, 12V, 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 5.0A 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 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 cycleby-cycle current limiting. An output voltage tolerance of ±4%, within specified input voltages and output load conditions, is guaranteed for the power supply system. Flyback Regulator 1 2 3 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. SIMPLE SWITCHER, Switchers Made Simple are registered trademarks of Texas Instruments. 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 © 2004–2010, Texas Instruments Incorporated LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com 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. Absolute Maximum Ratings (1) −0.4V ≤ VIN ≤ 45V Input Voltage −0.4V ≤ VSW ≤ 65V Switch Voltage Switch Current (2) Internally Limited Compensation Pin Voltage −0.4V ≤ VCOMP ≤ 2.4V Feedback Pin Voltage −0.4V ≤ VFB ≤ 2 VOUT −65°C to +150°C Storage Temperature Range Lead Temperature (Soldering, 10 sec.) 260°C Maximum Junction Temperature (3) Power Dissipation 150°C (3) Minimum ESD Rating (1) (2) (3) Internally Limited (C = 100 pF, R = 1.5 kΩ) 2 kV 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 guaranteed under these conditions. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note that switch current and output current are not identical in a step-up regulator. Output current cannot be internally limited when the LM2587 is used as a step-up regulator. To prevent damage to the switch, the output current must be externally limited to 5A. However, output current is internally limited when the LM2587 is used as a flyback regulator (see the Application Hints section for more information). The junction temperature of the device (TJ) is a function of the ambient temperature (TA), the junction-to-ambient thermal resistance (θJA), and the power dissipation of the device (PD). A thermal shutdown will occur if the temperature exceeds the maximum junction temperature of the device: PD × θJA + TA(MAX) ≥ TJ(MAX). For a safe thermal design, check that the maximum power dissipated by the device is less than: PD ≤ [TJ(MAX) − TA(MAX))]/θJA. When calculating the maximum allowable power dissipation, derate the maximum junction temperature—this ensures a margin of safety in the thermal design. Operating Ratings 4V ≤ VIN ≤ 40V Supply Voltage Output Switch Voltage 0V ≤ VSW ≤ 60V Output Switch Current ISW ≤ 5.0A −40°C ≤ TJ ≤ +125°C Junction Temperature Range 2 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 LM2587-3.3 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions SYSTEM PARAMETERS Test Circuit of Figure 6 VOUT Output Voltage Typical Min Max Units 3.3 3.17/3.14 3.43/3.46 V 20 50/100 mV 20 50/100 mV (1) VIN = 4V to 12V ILOAD = 400 mA to 1.75A ΔVOUT/ Line Regulation VIN = 4V to 12V ΔVIN ΔVOUT/ ILOAD = 400 mA Load Regulation VIN = 12V ΔILOAD η ILOAD = 400 mA to 1.75A Efficiency VIN = 12V, ILOAD = 1A 75 Output Reference Measured at Feedback Pin 3.3 Voltage VCOMP = 1.0V Reference Voltage VIN = 4V to 40V UNIQUE DEVICE PARAMETERS VREF ΔVREF % (2) 3.242/3.234 3.358/3.366 V 2.0 mV Line Regulation GM AVOL (1) (2) (3) Error Amp ICOMP = −30 μA to +30 μA Transconductance VCOMP = 1.0V Error Amp VCOMP = 0.5V to 1.6V Voltage Gain RCOMP = 1.0 MΩ 1.193 0.678 260 151/75 2.259 mmho V/V (3) 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 6 and Figure 7, 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 guaranteed via correlation using standard Statistical Quality Control (SQC) methods. A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL. Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 3 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com LM2587-5.0 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions SYSTEM PARAMETERS Test Circuit of Figure 6 VOUT Output Voltage Typical Min Max Units 5.0 4.80/4.75 5.20/5.25 V 20 50/100 mV 20 50/100 mV (1) VIN = 4V to 12V ILOAD = 500 mA to 1.45A ΔVOUT/ Line Regulation VIN = 4V to 12V ΔVIN ΔVOUT/ ILOAD = 500 mA Load Regulation VIN = 12V ΔILOAD η ILOAD = 500 mA to 1.45A Efficiency VIN = 12V, ILOAD = 750 mA 80 Output Reference Measured at Feedback Pin 5.0 Voltage VCOMP = 1.0V Reference Voltage VIN = 4V to 40V UNIQUE DEVICE PARAMETERS VREF ΔVREF % (2) 4.913/4.900 5.088/5.100 3.3 V mV Line Regulation GM AVOL (1) (2) (3) 4 Error Amp ICOMP = −30 μA to +30 μA Transconductance VCOMP = 1.0V Error Amp VCOMP = 0.5V to 1.6V Voltage Gain RCOMP = 1.0 MΩ 0.750 0.447 165 99/49 1.491 mmho V/V (3) 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 6 and Figure 7, 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 guaranteed via correlation using standard Statistical Quality Control (SQC) methods. A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL. Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 LM2587-12 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions SYSTEM PARAMETERS Test Circuit of Figure 7 VOUT Output Voltage Typical Min Max Units 12.0 11.52/11.40 12.48/12.60 V 20 100/200 mV 20 100/200 mV (1) VIN = 4V to 10V ILOAD = 300 mA to 1.2A ΔVOUT/ Line Regulation VIN = 4V to 10V ΔVIN ΔVOUT/ ILOAD = 300 mA Load Regulation VIN = 10V ΔILOAD η ILOAD = 300 mA to 1.2A Efficiency UNIQUE DEVICE PARAMETERS VREF ΔVREF VIN = 10V, ILOAD = 1A 90 % (2) Output Reference Measured at Feedback Pin Voltage VCOMP = 1.0V Reference Voltage VIN = 4V to 40V 12.0 11.79/11.76 12.21/12.24 V 7.8 mV Line Regulation GM AVOL (1) (2) (3) Error Amp ICOMP = −30 μA to +30 μA Transconductance VCOMP = 1.0V Error Amp VCOMP = 0.5V to 1.6V Voltage Gain RCOMP = 1.0 MΩ 0.328 0.186 70 41/21 0.621 mmho V/V (3) 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 6 and Figure 7, 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 guaranteed via correlation using standard Statistical Quality Control (SQC) methods. A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL. Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 5 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com LM2587-ADJ Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions SYSTEM PARAMETERS Test Circuit of Figure 7 VOUT Output Voltage Typical Min Max Units 12.0 11.52/11.40 12.48/12.60 V 20 100/200 mV 20 100/200 mV (1) VIN = 4V to 10V ILOAD = 300 mA to 1.2A ΔVOUT/ Line Regulation VIN = 4V to 10V ΔVIN ΔVOUT/ ILOAD = 300 mA Load Regulation VIN = 10V ΔILOAD η ILOAD = 300 mA to 1.2A Efficiency UNIQUE DEVICE PARAMETERS VREF ΔVREF VIN = 10V, ILOAD = 1A 90 % (2) Output Reference Measured at Feedback Pin Voltage VCOMP = 1.0V Reference Voltage VIN = 4V to 40V 1.230 1.208/1.205 1.252/1.255 1.5 V mV Line Regulation GM AVOL IB Error Amp ICOMP = −30 μA to +30 μA Transconductance VCOMP = 1.0V Error Amp VCOMP = 0.5V to 1.6V Voltage Gain RCOMP = 1.0 MΩ Error Amp VCOMP = 1.0V 3.200 1.800 670 400/200 6.000 mmho V/V (3) 125 425/600 nA Input Bias Current (1) (2) (3) 6 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 6 and Figure 7, 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 guaranteed via correlation using standard Statistical Quality Control (SQC) methods. A 1.0 MΩ resistor is connected to the compensation pin (which is the error amplifier output) to ensure accuracy in measuring AVOL. Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 All Output Voltage Versions Electrical Characteristics (1) Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol IS Parameters Input Supply Current Conditions Typical (Switch Off) Min 11 Max Units 15.5/16.5 mA (2) VUV Input Supply ISWITCH = 3.0A 85 140/165 mA RLOAD = 100Ω 3.30 3.05 3.75 V 100 85/75 115/125 kHz Undervoltage Lockout fO Oscillator Frequency Measured at Switch Pin RLOAD = 100Ω VCOMP = 1.0V fSC Short-Circuit Measured at Switch Pin Frequency RLOAD = 100Ω 25 kHz VFEEDBACK = 1.15V VEAO Error Amplifier Output Swing Upper Limit 2.8 2.6/2.4 V (3) Lower Limit 0.25 0.40/0.55 V (2) IEAO Error Amp (4) Output Current 165 110/70 260/320 μA 11.0 8.0/7.0 17.0/19.0 μA 98 93/90 (Source or Sink) ISS Soft Start Current VFEEDBACK = 0.92V VCOMP = 1.0V D Maximum Duty Cycle RLOAD = 100Ω % (3) IL VSUS Switch Leakage Switch Off Current VSWITCH = 60V 15 Switch Sustaining dV/dT = 1.5V/ns 300/600 65 μA V Voltage VSAT Switch Saturation ISWITCH = 5.0A 0.7 1.1/1.4 V 9.5 A Voltage ICL NPN Switch 6.5 5.0 Current Limit COMMON DEVICE PARAMETERS (5) T Package, Junction to Ambient (6) 65 θJA T Package, Junction to Ambient (7) 45 θJC T Package, Junction to Case θJA (1) (2) (3) (4) (5) (6) (7) Thermal Resistance 2 All room temperature limits are 100% production tested, and all limits at temperature extremes are guaranteed 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. Adj: VFB = 1.41V; 3.3V: VFB = 3.80V; 5.0V: VFB = 5.75V; 12V: VFB = 13.80V. To measure this parameter, the feedback voltage is set to a low value, depending on the output version of the device, to force the error amplifier output high. Adj: VFB = 1.05V; 3.3V: VFB = 2.81V; 5.0V: VFB = 4.25V; 12V: VFB = 10.20V. 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). 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 6 and Figure 7, system performance will be as specified by the system parameters. 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. 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. Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 7 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com All Output Voltage Versions Electrical Characteristics (1) (continued) Specifications with standard type face are for TJ = 25°C, and those in bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 5V. Symbol Parameters Conditions Typical S Package, Junction to Ambient (8) 56 θJA S Package, Junction to Ambient (9) 35 θJA S Package, Junction to Ambient (10) 26 θJC S Package, Junction to Case θJA Min Max Units °C/W 2 (8) Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board area of 0.136 square inches (the same size as the TO-263 package) of 1 oz. (0.0014 in. thick) copper. (9) Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board area of 0.4896 square inches (3.6 times the area of the TO-263 package) of 1 oz. (0.0014 in. thick) copper. (10) Junction to ambient thermal resistance for the 5 lead TO-263 mounted horizontally against a PC board copper area of 1.0064 square inches (7.4 times the area of the TO-263 package) of 1 oz. (0.0014 in. thick) copper. Additional copper area will reduce thermal resistance further. See the thermal model in Switchers Made Simple® software. 8 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 Typical Performance Characteristics Supply Current vs Temperature Reference Voltage vs Temperature ΔReference Voltage vs Supply Voltage Supply Current vs Switch Current Current Limit vs Temperature Feedback Pin Bias Current vs Temperature Switch Saturation Voltage vs Temperature Switch Transconductance vs Temperature Oscillator Frequency vs Temperature Error Amp Transconductance vs Temperature Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 9 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com Typical Performance Characteristics (continued) Error Amp Voltage Gain vs Temperature Short Circuit Frequency vs Temperature Connection Diagrams Figure 1. Bent, Staggered Leads 5-Lead TO-220 (T) Top View Figure 2. Bent, Staggered Leads 5-Lead TO-220 (T) Side View Figure 3. 5-Lead TO-263 (S) Top View Figure 4. 5-Lead TO-263 (S) Side View 10 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 For Fixed Versions3.3V, R1 = 3.4k, R2 = 2k5V, R1 = 6.15k, R2 = 2k12V, R1 = 8.73k, R2 = 1kFor Adj. VersionR1 = Short (0Ω), R2 = Open Figure 5. Block Diagram Test Circuits CIN1—100 μF, 25V Aluminum ElectrolyticCIN2—0.1 μF CeramicT—22 μH, 1:1 Schott #67141450D—1N5820COUT—680 μF, 16V Aluminum ElectrolyticCC—0.47 μF CeramicRC—2k Figure 6. LM2587-3.3 and LM2587-5.0 Test Circuit Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 11 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com CIN1—100 μF, 25V Aluminum ElectrolyticCIN2—0.1 μF CeramicL—15 μH, Renco #RL-5472-5D—1N5820COUT—680 μF, 16V Aluminum ElectrolyticCC—0.47 μF CeramicRC—2kFor 12V Devices: R1 = Short (0Ω) and R2 = OpenFor ADJ Devices: R1 = 48.75k, ±0.1% and R2 = 5.62k, ±1% Figure 7. LM2587-12 and LM2587-ADJ Test Circuit Flyback Regulator Operation The LM2587 is ideally suited for use in the flyback regulator topology. The flyback regulator can produce a single output voltage, such as the one shown in Figure 8, or multiple output voltages. In Figure 8, 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 8): 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 8, 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 9. Typical Performance Characteristics observed during the operation of this circuit are shown in Figure 10. Figure 8. 12V Flyback Regulator Design Example 12 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 Performance Characteristics A: Switch Voltage, 10 V/divB: Switch Current, 5 A/divC: Output Rectifier Current, 5 A/divD: Output Ripple Voltage, 100 mV/div AC-Coupled Horizontal: 2 μs/div Figure 9. Switching Waveforms Figure 10. VOUT Load Current Step Response Typical Flyback Regulator Applications Figure 11 Figure 12 Figure 13 Figure 15 Figure 16 show six typical flyback applications, varying from single output to triple output. Each drawing contains the part number(s) and manufacturer(s) for every component except the transformer. For the transformer part numbers and manufacturers names, see the table in TRANSFORMER SELECTION (T). For applications with different output voltages—requiring the LM2587ADJ—or different output configurations that do not match the standard configurations, refer to the Switchers Made Simple software. Figure 11. Single-Output Flyback Regulator Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 13 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com Figure 12. Single-Output Flyback Regulator Figure 13. Single-Output Flyback Regulator 14 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 Figure 14. Dual-Output Flyback Regulator Figure 15. Dual-Output Flyback Regulator Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 15 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com Figure 16. Triple-Output Flyback Regulator TRANSFORMER SELECTION (T) Table 1 lists the standard transformers available for flyback regulator applications. Included in the table are the turns ratio(s) for each transformer, as well as the output voltages, input voltage ranges, and the maximum load currents for each circuit. Table 1. Transformer Selection Table Applications Transformers Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 T1 T1 T1 T2 T3 T4 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 1 1 1 2.5 0.8 0.35 VOUT2 −12V −12V 12V IOUT2 (Max) 0.3A 1A 0.5A 2.5 0.8 VIN N1 N2 0.8 VOUT3 −12V IOUT3 (Max) 0.5A N3 0.8 Table 2. Transformer Manufacturer Guide Transformer Type (1) (2) (3) (4) 16 Manufacturers' Part Numbers Coilcraft (1) Coilcraft (1) Pulse (2) Renco (3) Schott (4) Surface Mount Surface Mount T1 Q4434-B Q4435-B PE-68411 RL-5530 67141450 T2 Q4337-B Q4436-B PE-68412 RL-5531 67140860 T3 Q4343-B — PE-68421 RL-5534 67140920 Coilcraft Inc.,: Phone: (800) 322-26451102 Silver Lake Road, Cary, IL 60013: Fax: (708) 639-1469 Pulse Engineering Inc.,: Phone: (619) 674-810012220 World Trade Drive, San Diego, CA 92128: Fax: (619) 674-8262 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 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 Table 2. Transformer Manufacturer Guide (continued) Transformer Type T4 Manufacturers' Part Numbers Coilcraft (1) Q4344-B Coilcraft (1) Pulse (2) Surface Mount Surface Mount — PE-68422 Renco (3) Schott (4) RL-5535 67140930 TRANSFORMER FOOTPRINTS Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 and Figure 34 show the footprints of each transformer, listed in Table 1. T1 T2 Figure 17. Coilcraft Q4434-B (Top View) Figure 18. Coilcraft Q4337-B (Top View) T3 T4 Figure 19. Coilcraft Q4343-B (Top View) Figure 20. Coilcraft Q4344-B (Top View) T1 T2 Figure 21. Coilcraft Q4435-B (Surface Mount) (Top View) Figure 22. Coilcraft Q4436-B (Surface Mount) (Top View) T1 T2 Figure 23. Pulse PE-68411 (Surface Mount) (Top View) Figure 24. Pulse PE-68412 (Surface Mount) (Top View) Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 17 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com T3 T4 Figure 25. Pulse PE-68421 (Surface Mount) (Top View) Figure 26. Pulse PE-68422 (Surface Mount) (Top View) T1 T2 Figure 27. Renco RL-5530 (Top View) Figure 28. Renco RL-5531 (Top View) T3 T4 Figure 29. Renco RL-5534 (Top View) Figure 30. Renco RL-5535 (Top View) T1 T2 Figure 31. Schott 67141450 (Top View) Figure 32. Schott 67140860 (Top View) T3 T4 Figure 33. Schott 67140920 (Top View) Figure 34. Schott 67140930 (Top View) Step-Up (Boost) Regulator Operation Figure 35 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. 18 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 A brief explanation of how the LM2587 Boost Regulator works is as follows (refer to Figure 35). 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. By adding a small number of external components (as shown in Figure 35), the LM2587 can be used to produce a regulated output voltage that is greater than the applied input voltage. The switching waveforms observed during the operation of this circuit are shown in Figure 36. Typical performance of this regulator is shown in Figure 37. Figure 35. 12V Boost Regulator Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 19 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com Typical Performance Characteristics Figure 36. Switching Waveforms A: Switch Voltage, 10 V/divB: Switch Current, 5 A/divC: Inductor Current, 5 A/divD: Output Ripple Voltage, 100 mV/div, AC-Coupled Horizontal: 2 μs/div Figure 37. VOUT Response to Load Current Step Typical Boost Regulator Applications Figure 38 and Figure 39 Figure 40 and Figure 41 show four typical boost applications)—one fixed and three using the adjustable version of the LM2587. Each drawing contains the part number(s) and manufacturer(s) for every component. For the fixed 12V output application, the part numbers and manufacturers' names for the inductor are listed in a table in Figure 41. For applications with different output voltages, refer to the Switchers Made Simple software. Figure 38. +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 38. 20 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 Table 3. Inductor Selection Table Coilcraft (1) Pulse R4793-A (1) (2) (3) (4) (2) PE-53900 Renco (3) Schott (4) RL-5472-5 67146520 Coilcraft Inc.,: Phone: (800) 322-26451102 Silver Lake Road, Cary, IL 60013: Fax: (708) 639-1469 Pulse Engineering Inc.,: Phone: (619) 674-810012220 World Trade Drive, San Diego, CA 92128: Fax: (619) 674-8262 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 39. +12V to +24V Boost Regulator Figure 40. +24V to +36V Boost Regulator *The LM2587 will require a heat sink in these applications. The size of the heat sink will depend on the maximum ambient temperature. To calculate the thermal resistance of the IC and the size of the heat sink needed, see the “Heat Sink/Thermal Considerations” section in the Application Hints. Figure 41. +24V to +48V Boost Regulator Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 21 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com Application Hints Figure 42. Boost Regulator PROGRAMMING OUTPUT VOLTAGE (SELECTING R1 AND R2) Referring to the adjustable regulator in Figure 42, 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 42), 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 43), 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. 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 43). 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. 22 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 Figure 43. Flyback Regulator In addition, a small bypass capacitor is required due to the noise generated by the input current pulses. To eliminate the noise, insert a 1.0 μF ceramic capacitor between VIN and ground as close as possible to the device. SWITCH VOLTAGE LIMITS In a flyback regulator, the maximum steady-state voltage appearing at the switch, when it is off, is set by the transformer turns ratio, N, the output voltage, VOUT, and the maximum input voltage, VIN (Max): VSW(OFF) = VIN (Max) + (VOUT +VF)/N (3) where VF is 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 9, 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 43 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 Guideline” 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 43. 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 10Ω and 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. 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 43. 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. Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 23 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com Figure 44. Input Line Filter OUTPUT VOLTAGE LIMITATIONS The maximum output voltage of a boost regulator is the maximum switch voltage minus a diode drop. In a flyback regulator, the maximum output voltage is determined by the turns ratio, N, and the duty cycle, D, by the equation: VOUT ≈ N × VIN × D/(1 − D) (4) The duty cycle of a flyback regulator is determined by the following equation: (5) Theoretically, the maximum output voltage can be as large as desired—just keep increasing the turns ratio of the transformer. However, there exists some physical limitations that prevent the turns ratio, and thus the output voltage, from increasing to infinity. The physical limitations are capacitances and inductances in the LM2587 switch, the output diode(s), and the transformer—such as reverse recovery time of the output diode (mentioned above). NOISY INPUT LINE CONDITION) A small, low-pass RC filter should be used at the input pin of the LM2587 if the input voltage has an unusual large amount of transient noise, such as with an input switch that bounces. The circuit in Figure 44 demonstrates the layout of the filter, with the capacitor placed from the input pin to ground and the resistor placed between the input supply and the input pin. Note that the values of RIN and CIN shown in the schematic are good enough for most applications, but some readjusting might be required for a particular application. If efficiency is a major concern, replace the resistor with a small inductor (say 10 μH and rated at 100 mA). STABILITY All current-mode controlled regulators can suffer from an instability, known as subharmonic oscillation, if they operate with a duty cycle above 50%. To eliminate subharmonic oscillations, a minimum value of inductance is required to ensure stability for all boost and flyback regulators. The minimum inductance is given by: (6) where VSAT is the switch saturation voltage and can be found in the Characteristic Curves. 24 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 LM2587 www.ti.com SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 Figure 45. 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 45). When using the Adjustable version, physically locate the programming resistors as near the regulator IC as possible, to keep the sensitive feedback wiring short. HEAT SINK/THERMAL CONSIDERATIONS In many cases, no heat sink is required to keep the LM2587 junction temperature within the allowed operating range. For each application, to determine whether or not a heat sink will be required, the following must be identified: 1) Maximum ambient temperature (in the application). 2) Maximum regulator power dissipation (in the application). 3) Maximum allowed junction temperature (125°C for the LM2587). For a safe, conservative design, a temperature approximately 15°C cooler than the maximum junction temperature should be selected (110°C). 4) LM2587 package thermal resistances θJA and θJC (given in the Electrical Characteristics). Total power dissipated (PD) by the LM2587 can be estimated as follows: Boost: (7) VIN is the minimum input voltage, VOUT is the output voltage, N is the transformer turns ratio, D is the duty cycle, and ILOAD is the maximum load current (and ∑ILOAD is the sum of the maximum load currents for multiple-output flyback regulators). The duty cycle is given by: Boost: (8) Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 25 LM2587 SNVS115C – MAY 2004 – REVISED FEBRUARY 2010 www.ti.com 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: 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, National Semiconductor is making available computer design software. Switchers Made Simple software is available on a (3½″) diskette for IBM compatable computers from a National Semiconductor sales office in your area or the National Semiconductor Customer Response Center (1-800-272-9959). European Magnetic Vendor Contacts Please contact the following addresses for details of local distributors or representatives: Coilcraft 21 Napier Place Wardpark North Cumbernauld, Scotland G68 0LL Phone: +44 1236 730 595 Fax: +44 1236 730 627 Pulse Engineering Dunmore Road Tuam Co. Galway, Ireland Phone: +353 93 24 107 Fax: +353 93 24 459 26 Submit Documentation Feedback Copyright © 2004–2010, Texas Instruments Incorporated Product Folder Links: LM2587 PACKAGE OPTION ADDENDUM www.ti.com 16-Nov-2012 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Qty Drawing Eco Plan Lead/Ball Finish (2) MSL Peak Temp Samples (3) (Requires Login) LM2587S-12 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD CU SNPB Level-3-235C-168 HR LM2587S-12/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM2587S-3.3 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD CU SNPB Level-3-235C-168 HR LM2587S-3.3/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM2587S-5.0 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD CU SNPB Level-3-235C-168 HR LM2587S-5.0/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM2587S-ADJ ACTIVE DDPAK/ TO-263 KTT 5 45 TBD CU SNPB Level-3-235C-168 HR LM2587S-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM2587SX-12 ACTIVE DDPAK/ TO-263 KTT 5 500 TBD CU SNPB Level-3-235C-168 HR LM2587SX-12/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM2587SX-3.3 ACTIVE DDPAK/ TO-263 KTT 5 500 TBD CU SNPB Level-3-235C-168 HR LM2587SX-5.0 ACTIVE DDPAK/ TO-263 KTT 5 500 TBD CU SNPB Level-3-235C-168 HR LM2587SX-5.0/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM2587SX-ADJ ACTIVE DDPAK/ TO-263 KTT 5 500 TBD CU SNPB Level-3-235C-168 HR LM2587SX-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR LM2587T-12 ACTIVE TO-220 NDH 5 45 TBD CU SNPB Level-1-NA-UNLIM LM2587T-12/NOPB ACTIVE TO-220 NDH 5 45 Pb-Free (RoHS Exempt) CU SN Level-1-NA-UNLIM LM2587T-3.3 ACTIVE TO-220 NDH 5 45 TBD CU SNPB Level-1-NA-UNLIM Addendum-Page 1 PACKAGE OPTION ADDENDUM www.ti.com 16-Nov-2012 Orderable Device Status (1) Package Type Package Pins Package Qty Drawing LM2587T-3.3/NOPB ACTIVE TO-220 NDH 5 45 Eco Plan Lead/Ball Finish (2) MSL Peak Temp Samples (3) (Requires Login) Pb-Free (RoHS Exempt) CU SN Level-1-NA-UNLIM LM2587T-5.0 ACTIVE TO-220 NDH 5 45 TBD CU SNPB Level-1-NA-UNLIM LM2587T-5.0/NOPB ACTIVE TO-220 NDH 5 45 Pb-Free (RoHS Exempt) CU SN Level-1-NA-UNLIM LM2587T-ADJ ACTIVE TO-220 NDH 5 45 TBD CU SNPB Level-1-NA-UNLIM LM2587T-ADJ/NOPB ACTIVE TO-220 NDH 5 45 Pb-Free (RoHS Exempt) CU SN Level-1-NA-UNLIM (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. (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. 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. Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 16-Nov-2012 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 LM2587SX-12 DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 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-3.3 DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2587SX-5.0 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 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 16-Nov-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2587SX-12 DDPAK/TO-263 KTT 5 500 358.0 343.0 63.0 LM2587SX-12/NOPB DDPAK/TO-263 KTT 5 500 358.0 343.0 63.0 LM2587SX-3.3 DDPAK/TO-263 KTT 5 500 358.0 343.0 63.0 LM2587SX-5.0 DDPAK/TO-263 KTT 5 500 358.0 343.0 63.0 LM2587SX-5.0/NOPB DDPAK/TO-263 KTT 5 500 358.0 343.0 63.0 LM2587SX-ADJ DDPAK/TO-263 KTT 5 500 358.0 343.0 63.0 LM2587SX-ADJ/NOPB DDPAK/TO-263 KTT 5 500 358.0 343.0 63.0 Pack Materials-Page 2 MECHANICAL DATA NDH0005D www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve 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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