The ADP2291 is a simple, safe linear charger for a single-cell, lithium ion battery.
The ADP2291 provides a simple, safe linear charging solution for single‑cell lithium‑ion batteries. It operates from a wide 4.5 V to 12 V input range, delivers a regulated 4.2 V output with ±1 % accuracy, and supports adjustable charging currents up to 1.5 A. Safety functions include automatic reverse isolation, output‑overshoot protection, thermal shutdown, and a sub‑picoampere shutdown current.
Typical applications are wireless handsets, smart handhelds, PDAs, digital cameras, and other portable devices that use a single‑cell lithium‑ion battery. The device is offered in an 8‑lead MSOP package and a 3 × 3 mm LFCSP package for space‑constrained designs.
| Input Voltage Range | 4.5 V to 12 V |
|---|---|
| Output Voltage | 4.2 V |
| Maximum Charging Current | 1.5 A |
| Output Voltage Accuracy | ±1 % |
| Shutdown Current (Power‑down mode) | <1 pA |
The device operates from 4.5 V to 12 V input voltage.
It can deliver up to 1.5 A of charging current.
Yes, it includes automatic reverse isolation without the need for an external blocking diode.
The shutdown current is below 1 pA.