General description of LM1577/LM2577 simple switch step-up voltage regulator
The LM1577 and LM2577 are monolithic integrated circuits that provide power and control functions for step‑up (boost), flyback, and forward converter switching regulators. They are offered in 12 V, 15 V, and adjustable output versions and require few external components.
The document includes ordering information, absolute maximum ratings, electrical characteristics, thermal parameters, and physical dimensions, along with application notes for boost, flyback, and multiple‑output regulator designs.
| Output voltage versions | 12 V, 15 V, Adjustable |
|---|---|
| Oscillator frequency | 52 kHz |
| NPN switch current | 3.0 A |
| Input voltage range | 3.5 V to 40 V |
| Output switch voltage rating | 65 V |
The devices use a 52 kHz fixed‑frequency internal oscillator.
The output switch can tolerate up to 65 V.
The regulator is offered in 12 V, 15 V, and adjustable output versions.
They operate with an input voltage from 3.5 V up to 40 V.