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LM2575 -
SIMPLE SWITCHER 1A Step-Down Voltage Regulator
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Features
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3.3V, 5V, 12V, 15V, and adjustable output versions
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Adjustable version output voltage range,
1.23V to 37V (57V for HV version) ±4% max over
line and load conditions
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Guaranteed 1A output current
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Wide input voltage range, 40V up to 60V for HV version
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Requires only 4 external components
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52 kHz fixed frequency internal oscillator
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TTL shutdown capability, low power standby mode
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High efficiency
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Uses readily available standard inductors
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Thermal shutdown and current limit protection
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P
+ Product Enhancement tested
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General Description
The LM2575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck)
switching regulator, capable of driving a 1A load with excellent line and load regulation. More...
Applications
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Simple high-efficiency step-down (buck) regulator
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Efficient pre-regulator for linear regulators
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On-card switching regulators
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Positive to negative converter (Buck-Boost)
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Typical Application
click for larger image
| Parameters | Values |
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| Output Current |
1000 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) |
88, 77, 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 37V, 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
| LM25010▲ | Thermally Enhanced Package, Higher Efficiency, Higher Operating Frequency & Better Transient Respons |
| LM25575▲ | Enhanced Package, More Efficient And Better Transient Response |
| LM2595▲ | 1A, 150 Khz, Smaller Inductor |
| LM2672▲ | Has Sync Pin, Improved Switching Frequency And Efficiency |
| LM2675▲ | Thermally Enhanced Package, Higher Efficiency And Higher Operating Frequency |
| LM2695▲ | More Efficient, Improved Switching Frequency |
| LM2734▲ | 1A SOT23 3.0V To 20V Vin, 500Khz - 3Mhz FSW |
| LM5010▲ | 1A, 80V Vin, 50Khz-800Khz FSW |
Additional Resources
Online Seminars
Design Tools
Application Notes
Connection Diagram
click for larger image
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Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
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| LM1575/LM2575/LM2575HV SIMPLE SWITCHER 1A Step-Down Voltage Regulator |
856
Kbytes |
26-Apr-07 |
Download |
LM1575/LM2575/LM2575HV SIMPLE SWITCHER 1A Step-Down Voltage Regulator (Japanese)
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1032 Kbytes |
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Package Availability, Models, Samples & Pricing
| Obsolete Part | Alternate Part or
Supplier | Source | Last Time Buy Date |
LM2575HVM-12
| LM22672MR-ADJ
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575HVM-15
| LM22672MR-ADJ
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LM2575HVM-5.0
| LM2575HVMX-5.0
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575HVM-ADJ
| LM22672MR-ADJ
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575HVMX-12
| LM22672MRX-ADJ
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575HVMX-15
| LM22672MRX-ADJ
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LM2575HVMX-ADJ
| LM5575MH
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575HVN-12
| LM22672MR-ADJ
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575HVN-15
| LM22672MR-ADJ
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LM2575HVS-5.0EP
| NONE
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575HVS-ADJEP
| NONE
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575HVSX-12
| LM2575HVS-12
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575M-12
| LM22672MR-ADJ
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575M-15
| LM22672MR-ADJ
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LM2575M-3.3
| LM22675MR-ADJ
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575MX-12
| LM22675MRX-ADJ
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575MX-15
| LM22672MR-ADJ
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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LM2575MX-3.3
| LM22675MRX-ADJ
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575N-12
| LM22675MR-ADJ
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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LM2575N-15
| LM22672MR-ADJ
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
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General Description
The LM2575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck)
switching regulator, capable of driving a 1A 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 LM2575 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces
the size of the heat sink, and in many cases no heat sink is required.
A standard series of inductors optimized for use with the LM2575 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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LM2575M-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575M-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575M-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575M-ADJ | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575MX-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575MX-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575MX-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575MX-ADJ | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575N-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575N-15 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575N-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575N-ADJ | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575S-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575S-15 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575S-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575S-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575S-ADJ | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575SX-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575SX-15 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575SX-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575SX-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575SX-ADJ | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575T-12 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575T-15 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575T-3.3 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575T-5.0 | SLM | 0 | 44046 | 0 | 0 | 3532500 | 1 | 1002356520
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LM2575T-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-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 |
| 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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[Information as of 7-Nov-2009]
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