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LM2576 -
SIMPLE SWITCHER® 3A Step-Down Voltage Regulator
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Features
| | 3.3V, 5V, 12V, 15V, and adjustable output versions |
| | Adjustable version output voltage range, 1.23V to 37V (57V for HV version) ±4% max over line and load conditions |
| | Guaranteed 3A output current |
| | Wide input voltage range, 40V up to 60V for HV version |
| | Requires only 4 external components |
| | 52 kHz fixed frequency internal oscillator |
| | TTL shutdown capability, low power standby mode |
| | High efficiency |
| | Uses readily available standard inductors |
| | Thermal shutdown and current limit protection |
| | P+ Product Enhancement tested |
General Description
The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. More...
Applications
| | Simple high-efficiency step-down (buck) regulator |
| | Efficient pre-regulator for linear regulators |
| | On-card switching regulators |
| | Positive to negative converter (Buck-Boost) |
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| Parameters | Values |
| Output Current |
3000 mA |
| Input Min Voltage |
4 Volt |
| Input Max Voltage |
40 Volt |
| Output Min |
3.3, 1.23, 12, 15, 5 Volt |
| Output Max |
3.3, 37, 12, 15, 5 Volt |
| Frequency Min |
52 kHz |
| Frequency Max |
52 kHz |
| Efficiency (peak) |
77, 88, 75 % |
| On/Off Pin |
Yes |
| Error Flag |
No |
| SoftStart |
No |
| Sync Pin |
No |
| Inverting |
Yes |
| Flyback |
No |
| RegType |
Switching Regulator |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| Adjustable Output |
Yes, No |
| Adj Switch Frequency |
No |
| PWM Mode |
Voltage |
| Topology |
Buck |
| Special Features |
SIMPLE SWITCHER regulator |
| Step-Down |
Yes |
| Multiple Output Capability |
No |
| Output Power |
Undefined Watt |
| Output Voltage |
3.3, Undefined, 12, 15, 5 Volt |
| Output Range |
15V, 5V, 12V, 1.23V to 65V, 3.3V |
| Switching Frequency |
52 kHz |
| Regulator Family |
SIMPLE SWITCHER |
| Synchronous Rectification |
No |
Typical Performance
*click for larger image
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WEBENCH Live Simulation!
Also Recommended
| LM25005▲ | Enhanced Package, More Efficient And Better Transient Response |
| LM25576▲ | Enhanced Package, More Efficient And Better Transient Response |
| LM2596▲ | More Efficient |
| LM2599▲ | Improved Switching Frequency, And Efficiency |
| LM2673▲ | Much Improved Switching Frequency |
| LM2676▲ | Much Improved Efficiency And Switching Frequency |
| LM2696▲ | Higher Efficiency, Enhanced Package, Better Transient Response |
| LM5005▲ | Higher Input Voltage, Higher Switching Frequency With Sync |
Additional Resources
Design Tools
Application Notes

Block Diagram
click for larger image
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Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
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| LM2576/LM2576HV Series SIMPLE SWITCHER® 3A Step-Down Voltage Regulator |
750 Kbytes |
3-Aug-04 |
Download |
LM2576/LM2576HV Series SIMPLE SWITCHER® 3A Step-Down Voltage Regulator (Japanese)
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369 Kbytes |
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Package Availability, Models, Samples & Pricing
| Obsolete Part | Alternate Part or
Supplier | Source | Last Time Buy Date |
LM2576HVS-15
| LM22676MR-ADJ
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LM2576HVSX-15
| LM22676MRX-ADJ
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LM2576HVT-3.3
| LM22676MR-ADJ
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2576S-15
| LM22676MR-ADJ
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LM2576SX-12
| LM22676TJX-ADJ
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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General Description
The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.
The LM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink is required.
A standard series of inductors optimized for use with the LM2576 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
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LM2576S-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576S-15 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576S-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576S-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576S-ADJ | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576SX-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576SX-15 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576SX-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576SX-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576SX-ADJ | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576T-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576T-15 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576T-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576T-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2576T-ADJ | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
Design Tools
| Title | Size in Kbytes |
Date |
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| SimpleSwitcher® DC-DC Converters Design Software |
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View |
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Application Notes
| Title | Size in Kbytes |
Date |
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| AN-946: Application Note 946 High-Efficiency 3A Battery Chargers Use LM2576 Regulators |
109 Kbytes |
3-Oct-02 |
Download |
AN-946 (Japanese): Application Note 946 High-Efficiency 3A Battery Chargers Use LM2576 Regulators
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72 Kbytes |
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| AN-776: Application Note 776 20 Watt Simple Switcher Forward Converter |
459 Kbytes |
26-Sep-02 |
Download |
| AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment |
162 Kbytes |
1-Oct-02 |
Download |
AN-1061 (Japanese): Application Note 1061 Power Conversion in Line-Powered Equipment
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215 Kbytes |
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More Application Notes
| Title | Size in Kbytes |
Date |
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| AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines |
229 Kbytes |
1-May-04 |
Download |
AN-1229 (Japanese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines
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304 Kbytes |
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AN-1229 (Chinese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines
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668 Kbytes |
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| AN-777: Application Note 777 LM2577 Three Output, Isolated Flyback Regulator |
112 Kbytes |
26-Sep-02 |
Download |
[Information as of 7-Nov-2009]
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