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National Semiconductor LM1575/LM2575/LM2575HV Simple Switcher 1A Step-Down Voltage Regulator Datasheet
The LM2575 series are monolithic integrated circuits that implement a step‑down (buck) switching regulator capable of delivering up to 1 A load current with excellent line and load regulation. Fixed‑output versions are available at 3.3 V, 5 V, 12 V, and 15 V, plus an adjustable version covering 1.23 V to 37 V (57 V for the HV version). The devices require only four external components and include an internal frequency‑compensated 52 kHz oscillator.
The family is offered in a variety of packages (TO‑220, TO‑263, DIP, surface‑mount, and ceramic DIP) with detailed ordering numbers. Electrical characteristics such as input voltage range, output current, efficiency, thermal resistance, and standby current are listed, along with typical application circuits and performance graphs.
National Semiconductor LM1575 specifications
| Maximum Input Voltage (LM2575) | 45 V |
|---|---|
| Output Current | 1 A |
| Standby Shutdown Current | 50 µA (typical) |
| Oscillator Frequency | ≈52 kHz |
| Efficiency (12 V in, 1 A out) | ≈75 % |
All National Semiconductor LM1575 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
- National Semiconductor LM1575/LM2575/LM2575HV Simple Switcher 1A Step-Down Voltage Regulator Datasheet 27 p
- National Semiconductor LM1575/LM2575/LM2575HV Series Simple Switcher 1A Step-Down Voltage Regulator Datasheet 28 p
- National Semiconductor LM1575 Data Sheet
- National Semiconductor LM1575/LM2575/LM2575HV Step-Down Voltage Regulator Datasheet 27 p
Questions answered in these manuals
How much standby current does the shutdown feature draw?
The shutdown feature draws about 50 µA typical standby current.
What is the oscillator frequency of the LM2575 regulators?
They use a fixed internal oscillator at approximately 52 kHz.
What fixed output voltages are available for the LM2575 series?
Fixed output versions are available at 3.3 V, 5 V, 12 V, and 15 V, plus an adjustable version.
How many external components are required to use the LM2575 regulator?
Only four external components are required.