lm2576

LM2576, LM2576HV www.ti.com SNVS107C –JUNE 1999–REVISED APRIL 2013 LM2576/LM2576HV Series SIMPLE SWITCHER® 3A Step-Down Voltage Regulator Check for Samples: LM2576, LM2576HV 1FEATURES DESCRIPTION The LM2576 series of regulators are monolithic 23• 3.3V, 5V, 12V, 15V, and Adjustable Output integrated circuits that provide all the active functionsVersions for a step-down (buck) switching regulator, capable of • Adjustable Version Output Voltage driving 3A load with excellent line and load regulation. Range,1.23V to 37V (57V for HV Version) ±4% These devices are available in fixed output voltages Max Over Line and Load Conditions of 3.3V, 5V, 12V, 15V, and an adjustable output version.• Specified 3A Output Current • Wide Input Voltage Range, 40V Up to 60V for Requiring a minimum number of external HV Version components, these regulators are simple to use and include internal frequency compensation and a fixed- • Requires Only 4 External Components frequency oscillator. • 52 kHz Fixed Frequency Internal Oscillator The LM2576 series offers a high-efficiency • TTL Shutdown Capability, Low Power Standby replacement for popular three-terminal linearMode regulators. It substantially reduces the size of the • High Efficiency heat sink, and in some cases no heat sink is required.• Uses Readily Available Standard Inductors • Thermal Shutdown and Current Limit A standard series of inductors optimized for use with Protection the LM2576 are available from several different manufacturers. This feature greatly simplifies the• P+ Product Enhancement Tested design of switch-mode power supplies. APPLICATIONS Other features include a specified ±4% tolerance on output voltage within specified input voltages and • Simple High-Efficiency Step-Down (Buck) output load conditions, and ±10% on the oscillatorRegulator frequency. External shutdown is included, featuring • Efficient Pre-Regulator for Linear Regulators 50 μA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as• On-Card Switching Regulators thermal shutdown for full protection under fault • Positive to Negative Converter (Buck-Boost) conditions. TYPICAL APPLICATION (Fixed Output Voltage Versions) Figure 1. 1 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. 2SIMPLE SWITCHER is a registered trademark of Texas Instruments. 3All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 1999–2013, Texas Instruments IncorporatedProducts conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. LM2576, LM2576HV SNVS107C –JUNE 1999–REVISED APRIL 2013 www.ti.com Block Diagram 3.3V R2 = 1.7k 5V, R2 = 3.1k 12V, R2 = 8.84k 15V, R2 = 11.3k For ADJ. Version R1 = Open, R2 = 0Ω Patent Pending 2 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM2576 LM2576HV LM2576, LM2576HV www.ti.com SNVS107C –JUNE 1999–REVISED APRIL 2013 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) (2) Maximum Supply Voltage LM2576 45V LM2576HV 63V ON /OFF Pin Input Voltage −0.3V ≤ V ≤ +VIN Output Voltage to Ground (Steady State) −1V Power Dissipation Internally Limited Storage Temperature Range −65°C to +150°C Maximum Junction Temperature 150°C Minimum ESD Rating (C = 100 pF, R = 1.5 kΩ) 2 kV Lead Temperature (Soldering, 10 Seconds) 260°C (1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not ensured specific performance limits. For ensured specifications and test conditions, see ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS. (2) If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications. OPERATING RATINGS Temperature Range LM2576/LM2576HV −40°C ≤ TJ ≤ +125°C Supply Voltage LM2576 40V LM2576HV 60V ELECTRICAL CHARACTERISTICS LM2576-3.3, LM2576HV-3.3 Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. LM2576-3.3 UnitsLM2576HV-3.3Symbol Parameter Conditions (Limits) Typ Limit (1) SYSTEM PARAMETERS Test Circuit Figure 21 and Figure 22 (2) VOUT Output Voltage VIN = 12V, ILOAD = 0.5A 3.3 V Circuit of Figure 21 and Figure 22 3.234 V(Min) 3.366 V(Max) VOUT Output Voltage 6V ≤ VIN ≤ 40V, 0.5A ≤ ILOAD ≤ 3A 3.3 V LM2576 Circuit of Figure 21 and Figure 22 3.168/3.135 V(Min) 3.432/3.465 V(Max) VOUT Output Voltage 6V ≤ VIN ≤ 60V, 0.5A ≤ ILOAD ≤ 3A 3.3 V LM2576HV Circuit of Figure 21 and Figure 22 3.168/3.135 V(Min) 3.450/3.482 V(Max) η Efficiency VIN = 12V, ILOAD = 3A 75 % (1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. (2) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2576/LM2576HV is used as shown in Figure 21 and Figure 22, system performance will be as shown in ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS. Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM2576 LM2576HV LM2576, LM2576HV SNVS107C –JUNE 1999–REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS LM2576-5.0, LM2576HV-5.0 Specifications with standard type face are for TJ = 25°C, and those with Figure 21 and Figure 22 boldface type apply over full Operating Temperature Range. LM2576-5.0 UnitsLM2576HV-5.0Symbol Parameter Conditions (Limits) Typ Limit (1) SYSTEM PARAMETERS Figure 21 and Figure 22 (2) VOUT Output Voltage VIN = 12V, ILOAD = 0.5A 5.0 V Circuit of Figure 21 and Figure 22 4.900 V(Min) 5.100 V(Max) VOUT Output Voltage 0.5A ≤ ILOAD ≤ 3A, 5.0 V LM2576 8V ≤ VIN ≤ 40V 4.800/4.750 V(Min) Circuit of Figure 21 and Figure 22 5.200/5.250 V(Max) VOUT Output Voltage 0.5A ≤ ILOAD ≤ 3A, 5.0 V LM2576HV 8V ≤ VIN ≤ 60V 4.800/4.750 V(Min) Circuit of Figure 21 and Figure 22 5.225/5.275 V(Max) η Efficiency VIN = 12V, ILOAD = 3A 77 % (1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. (2) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2576/LM2576HV is used as shown in Figure 21 and Figure 22, system performance will be as shown in ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS. ELECTRICAL CHARACTERISTICS LM2576-12, LM2576HV-12 Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. LM2576-12 UnitsLM2576HV-12Symbol Parameter Conditions (Limits) Typ Limit (1) SYSTEM PARAMETERS Test Circuit Figure 21 and Figure 22 (2) VOUT Output Voltage VIN = 25V, ILOAD = 0.5A 12 V Circuit of Figure 21 and Figure 22 V(Min)11.76 12.24 V(Max) VOUT Output Voltage 0.5A ≤ ILOAD ≤ 3A, 12 V LM2576 15V ≤ VIN ≤ 40V V(Min)11.52/11.40Circuit of Figure 21 and Figure 22 and 12.48/12.60 V(Max) VOUT Output Voltage 0.5A ≤ ILOAD ≤ 3A, 12 V LM2576HV 15V ≤ VIN ≤ 60V V(Min)11.52/11.40Circuit of Figure 21 and Figure 22 12.54/12.66 V(Max) η Efficiency VIN = 15V, ILOAD = 3A 88 % (1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. (2) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2576/LM2576HV is used as shown in Figure 21 and Figure 22, system performance will be as shown in ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS. 4 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM2576 LM2576HV LM2576, LM2576HV www.ti.com SNVS107C –JUNE 1999–REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS LM2576-15, LM2576HV-15 Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. LM2576-15 UnitsLM2576HV-15Symbol Parameter Conditions (Limits) Typ Limit (1) SYSTEM PARAMETERS Test Circuit Figure 21 and Figure 22 (2) VOUT Output Voltage VIN = 25V, ILOAD = 0.5A 15 V Circuit of Figure 21 and Figure 22 14.70 V(Min) 15.30 V(Max) VOUT Output Voltage 0.5A ≤ ILOAD ≤ 3A, 15 V LM2576 18V ≤ VIN ≤ 40V 14.40/14.25 V(Min) Circuit of Figure 21 and Figure 22 15.60/15.75 V(Max) VOUT Output Voltage 0.5A ≤ ILOAD ≤ 3A, 15 V LM2576HV 18V ≤ VIN ≤ 60V 14.40/14.25 V(Min) Circuit of Figure 21 and Figure 22 15.68/15.83 V(Max) η Efficiency VIN = 18V, ILOAD = 3A 88 % (1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. (2) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2576/LM2576HV is used as shown in Figure 21 and Figure 22, system performance will be as shown in ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS. ELECTRICAL CHARACTERISTICS LM2576-ADJ, LM2576HV-ADJ Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. LM2576-ADJ UnitsLM2576HV-ADJSymbol Parameter Conditions (Limits) Typ Limit (1) SYSTEM PARAMETERS Test Circuit Figure 21 and Figure 22 (2) VOUT Feedback Voltage VIN = 12V, ILOAD = 0.5A 1.230 V VOUT = 5V, 1.217 V(Min) Circuit of Figure 21 and Figure 22 1.243 V(Max) VOUT Feedback Voltage 0.5A ≤ ILOAD ≤ 3A, 1.230 V LM2576 8V ≤ VIN ≤ 40V 1.193/1.180 V(Min) VOUT = 5V, Circuit of Figure 21 and Figure 22 1.267/1.280 V(Max) VOUT Feedback Voltage 0.5A ≤ ILOAD ≤ 3A, 1.230 V LM2576HV 8V ≤ VIN ≤ 60V 1.193/1.180 V(Min) VOUT = 5V, Circuit of Figure 21 and Figure 22 1.273/1.286 V(Max) η Efficiency VIN = 12V, ILOAD = 3A, VOUT = 5V 77 % (1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. (2) External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2576/LM2576HV is used as shown in Figure 21 and Figure 22, system performance will be as shown in ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS. Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM2576 LM2576HV LM2576, LM2576HV SNVS107C –JUNE 1999–REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable version, VIN = 25V for the 12V version, and VIN = 30V for the 15V version. ILOAD = 500 mA. LM2576-XX UnitsLM2576HV-XXSymbol Parameter Conditions (Limits) Typ Limit (1) DEVICE PARAMETERS Ib Feedback Bias Current VOUT = 5V (Adjustable Version Only) 50 100/500 nA fO Oscillator Frequency See (2) 52 kHz 47/42 kHz (Min) 58/63 kHz (Max) VSAT Saturation Voltage IOUT = 3A (3) 1.4 V 1.8/2.0 V(Max) DC Max Duty Cycle (ON) See (4) 98 % 93 %(Min) ICL Current Limit See (3) (2) 5.8 A 4.2/3.5 A(Min) 6.9/7.5 A(Max) IL Output Leakage Current Output = 0V 2 mA(Max) Output = −1V 7.5 mA Output = −1V (5) (6) 30 mA(Max) IQ Quiescent Current See (5) 5 mA 10 mA(Max) ISTBY Standby Quiescent ON /OFF Pin = 5V (OFF) 50 μA Current 200 μA(Max) θJA Thermal Resistance T Package, Junction to Ambient (7) 65 θJA T Package, Junction to Ambient (8) 45 °C/WθJC T Package, Junction to Case 2 θJA S Package, Junction to Ambient (9) 50 ON /OFF CONTROL Test Circuit Figure 21 and Figure 22 VIH ON /OFF Pin VOUT = 0V 1.4 2.2/2.4 V(Min) Logic Input LevelVIL VOUT = Nominal Output Voltage 1.2 1.0/0.8 V(Max) IIH ON /OFF Pin Input ON /OFF Pin = 5V (OFF) 12 μA Current 30 μA(Max) IIL ON /OFF Pin = 0V (ON) 0 μA 10 μA(Max) (1) All limits specified at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC) methods. (2) The oscillator frequency reduces to approximately 11 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. (3) Output pin sourcing current. No diode, inductor or capacitor connected to output. (4) Feedback pin removed from output and connected to 0V. (5) Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V versions, and +25V for the 12V and 15V versions, to force the output transistor OFF. (6) VIN = 40V (60V for high voltage version).(7) 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. (8) Junction to ambient thermal resistance (no external heat sink) for the 5 lead TO-220 package mounted vertically, with ¼ inch leads soldered to a PC board containing approximately 4 square inches of copper area surrounding the leads. (9) If the DDPAK/TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package. Using 0.5 square inches of copper area, θJA is 50°C/W, with 1 square inch of copper area, θJA is 37°C/W, and with 1.6 or more square inches of copper area, θJA is 32°C/W. 6 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM2576 LM2576HV LM2576, LM2576HV www.ti.com SNVS107C –JUNE 1999–REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 21 and Figure 22) Normalized Output Voltage Line Regulation Figure 2. Figure 3. Dropout Voltage Current Limit Figure 4. Figure 5. Standby Quiescent Current Quiescent Current Figure 6. Figure 7. Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM2576 LM2576HV LM2576, LM2576HV SNVS107C –JUNE 1999–REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) (Circuit of Figure 21 and Figure 22) Switch Saturation Oscillator Frequency Voltage Figure 8. Figure 9. Efficiency Minimum Operating Voltage Figure 10. Figure 11. Quiescent Current Feedback Voltage vs Duty Cycle vs Duty Cycle Figure 12. Figure 13. 8 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM2576 LM2576HV LM2576, LM2576HV www.ti.com SNVS107C –JUNE 1999–REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) (Circuit of Figure 21 and Figure 22) Quiescent Current Minimum Operating Voltage vs Duty Cycle Figure 14. Figure 15. Feedback Voltage vs Duty Cycle Feedback Pin Current Figure 16. Figure 17. Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM2576 LM2576HV LM2576, LM2576HV SNVS107C –JUNE 1999–REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) (Circuit of Figure 21 and Figure 22) Maximum Power Dissipation (DDPAK/TO-263) Switching Waveforms VOUT = 15VIf the DDPAK/TO-263 package is used, the thermal resistance can be A: Output Pin Voltage, 50V/divreduced by increasing the PC board copper area thermally connected B: Output Pin Current, 2A/divto the package. Using 0.5 square inches of copper area, θJA is C: Inductor Current, 2A/div50°C/W, with 1 square inch of copper area, θJA is 37°C/W, and with D: Output Ripple Voltage, 50 mV/div,1.6 or more square inches of copper area, θJA is 32°C/W. AC-Coupled Horizontal Time Base: 5 μs/div Figure 18. Figure 19. Load Transient Response Figure 20. 10 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM2576 LM2576HV LM2576, LM2576HV www.ti.com SNVS107C –JUNE 1999–REVISED APRIL 2013 TEST CIRCUIT AND 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, the length of the leads indicated by heavy lines should be kept as short as possible. Single-point grounding (as indicated) or ground plane construction should be used for best results. When using the Adjustable version, physically locate the programming resistors near the regulator, to keep the sensitive feedback wiring short. CIN — 100 μF, 75V, Aluminum Electrolytic COUT — 1000 μF, 25V, Aluminum Electrolytic D1 — Schottky, MBR360 L1 — 100 μH, Pulse Eng. PE-92108 R1 — 2k, 0.1% R2 — 6.12k, 0.1% Figure 21. Fixed Output Voltage Versions where VREF = 1.23V, R1 between 1k and 5k Figure 22. Adjustable Output Voltage Version Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM2576 LM2576HV LM2576, LM2576HV SNVS107C –JUNE 1999–REVISED APRIL 2013 www.ti.com LM2576 Series Buck Regulator Design Procedure PROCEDURE (Fixed Output Voltage Versions) EXAMPLE (Fixed Output Voltage Versions) Given: Given: VOUT = Regulated Output Voltage VOUT = 5V (3.3V, 5V, 12V, or 15V) VIN(Max) = 15V VIN(Max) = Maximum Input Voltage ILOAD(Max) = 3A ILOAD(Max) = Maximum Load Current 1. Inductor Selection (L1) 1. Inductor Selection (L1) A. Select the correct Inductor value selection guide from Figure 23, A. Use the selection guide shown in Figure 24. Figure 24, Figure 25, or Figure 26. (Output voltages of 3.3V, 5V, 12V B. From the selection guide, the inductance area intersected by the or 15V respectively). For other output voltages, see the design 15V line and 3A line is L100. procedure for the adjustable version. C. Inductor value required is 100 μH. From the table in Figure 23. B. From the inductor value selection guide, identify the inductance Choose AIE 415-0930, Pulse Engineering PE92108, or Renco region intersected by VIN(Max) and ILOAD(Max), and note the RL2444. inductor code for that region. C. Identify the inductor value from the inductor code, and select an appropriate inductor from the table shown in Figure 23. Part numbers are listed for three inductor manufacturer