This document describes the features and characteristics of Analog Devices' ADP1111 micropower step-up/step-down switching regulator, including input voltage range, operating frequency, use of surface mount inductors, minimal external components required, and the ability to operate in step-up/step-down or inverting mode.
The ADP1111 switching regulator operates from 2 V to 30 V input and can function in step‑up, step‑down, or inverting modes. It requires only three external components and offers fixed‑voltage versions (3.3 V, 5 V, 12 V) as well as an adjustable version.
The device includes a 72 kHz oscillator, an internal 1.25 V reference, and programmable current‑limit circuitry. Detailed guidelines for selecting inductors, capacitors, and diodes are provided to optimize efficiency and output ripple. This manual is written in Chinese.