This document is an introduction to ADP1111, a micropower step-up/step-down SW regulator that provides adjustable and fixed 3.3V, 5V, 12V output voltages. The product operates at a frequency of 72kHz, has an input voltage range of 2V to 30V, uses surface mount inductors, requires very few external components, can operate in step-up/step-down or inverting mode, has a low battery detector, user adjustable current limit, internal 1A power switch, fixed or adjustable output voltage, and an 8-pin DIP or SO-8 package.
The ADP1111 is part of a family of step-up/step-down switching regulators that operates from an input voltage supply of 2 V to 30 V. It can be programmed to operate in step-up, step-down, or inverting applications with only three external components.
The device features fixed output options of 3.3 V, 5 V, and 12 V, as well as an adjustable version. It delivers up to 100 mA at 5 V from a 3 V input in step-up mode or 200 mA at 5 V from a 12 V input in step-down mode.
| Input Voltage Range (Step-Down) | 30.0 V |
|---|---|
| Oscillator Frequency | 72 kHz |
| Output Voltage (Fixed) | 3.3 V, 5 V, 12 V |
| Switch Current Limit | 400 mA (programmable) |
The device offers fixed outputs of 3.3 V, 5 V, and 12 V.
Only three external components are needed to operate in step-up/step-down or inverting modes.