This document introduces the basic functions and features of LP3855-ADJ 1.5A fast response ultra low dropout linear regulator. The regulator operates from a +2.5V to +7.0V input supply and features ultra low dropout, fast response, and low quiescent current, making it suitable for low voltage microprocessor applications.
The LP3855-ADJ linear regulator operates from a 2.5 V to 7.0 V input and provides an adjustable output up to 1.5 A. It features ultra‑low dropout (typically 24 mV at 150 mA, 240 mV at 1.5 A), low ground‑pin current, and a shutdown mode with only 10 nA quiescent current.
The device is offered in TO‑263, TO‑220 and SOT‑223 packages, supports operation from –40 °C to +125 °C, and includes over‑temperature/over‑current protection. Detailed electrical characteristics, ordering information, and typical application circuits are provided.
| Dropout Voltage (150 mA) | 24 mV |
|---|---|
| Dropout Voltage (1.5 A) | 240 mV |
| Ground Pin Current (1.5 A) | 4 mA |
| Shutdown Mode Quiescent Current | 10 nA |
| Guaranteed Output Current | 1.54 A |
| Operating Temperature Range | -40 °C to +125 °C |
| Input Supply Voltage Range | 2.5 V to 7.0 V |
The dropout voltage is typically 240 mV at a 1.5 A load.
In shutdown mode the pin draws about 10 nA of quiescent current.
It operates from –40 °C up to +125 °C.
The regulator is offered in TO‑263, TO‑220 and SOT‑223 packages.