The LM2854 is a 4A 500 kHz/1 MHz Synchronous SIMPLE SWITCHER® Buck Regulator that offers exceptional power conversion efficiency, line and load regulation, and output accuracy. It can accept an input voltage rail between 2.95V and 5.5V and deliver an adjustable and highly accurate output voltage as low as 0.8V.
The LP2957/LP2957A provides a 5 V output with very low quiescent current (150 µA typical at 1 mA load) and a low dropout voltage of about 470 mV at 250 mA. It features electronic shutdown, an error flag, reverse‑battery protection, and tight line and load regulation (0.04 % typical) with a low temperature coefficient (20 ppm/°C).
The device is offered in five‑lead TO‑220 and TO‑263 (plastic surface‑mount) packages and operates from an input voltage of 6 V to 30 V. Application hints cover snap‑on/snap‑off output, external capacitor requirements, shutdown input handling, and heatsink calculations. Electrical characteristics, typical performance curves, and physical dimensions are provided.
| Output voltage | 5.0 V (typical) |
|---|---|
| Maximum output current | 250 mA |
| Line and load regulation | 0.04 % typical |
| Temperature coefficient | 20 ppm/°C typical |
| Input voltage range | 6 V to 30 V |
| Available packages | Five‑lead TO‑220 and TO‑263 |
| Shutdown input low threshold | < 1.2 V (logic LOW) |
It is available in five‑lead TO‑220 and TO‑263 (plastic surface‑mount) packages.
A logic “LOW” below 1.2 V applied to the shutdown input disables the regulator; a pull‑up resistor may be required.