The ADP2291 is a simple and safe linear charger for single-cell lithium batteries, featuring adjustable charging current, low cost, automatic reverse isolation, deep discharge precharge mode, thermal shutdown, programmable termination timer, etc.
This document provides a complete description of the ADP2291 constant‑current/constant‑voltage linear charger for single‑cell lithium‑ion batteries. It includes features, typical operating circuits, pin configurations, and safety functions such as automatic reverse isolation and overshoot protection.
The handbook also contains detailed specifications, absolute maximum ratings, performance graphs, and guidance on setting charge current, charge time, and layout considerations for both MSOP and LFCSP packages.
| Input Voltage (VIN) range | 4.5 V – 12 V |
|---|---|
| Output Voltage (VOUT) | 4.2 V ± 1 % |
| Maximum Charge Current | Up to 1.5 A (adjustable) |
The device operates from an input voltage of 4.5 V to 12 V.
It can deliver an adjustable charging current up to 1.5 A.