Battery-protection circuit features precision voltage detection for longer cell life

Providing single-chip protection for 1-cell lithium-ion and lithium-polymer batteries, the AP9214L device is designed for use in rechargeable Li+ battery packs, as found in smart phones, cameras, and similar portable electronic equipment. The device targets manufacturers of battery protection modules, to enable accurate monitoring capability for safe charging and discharging, prolonging cell lifetime and minimizing energy losses.

The device features a Li+ protection circuit with a dual N-channel, common-drain MOSFET that can be turned off when overcharge voltage/current, over-discharge voltage/current, or load short-circuit conditions are detected. A stable temperature-coefficient characteristic contributes to the device’s high-accuracy voltage-detection capability, which can be precisely set within various voltage ranges as required by the end-application. It features 3.0µA at +25°C quiescent current, and a 13.5mΩ (typ) RSS(on) MOSFET. A power-down mode further cuts the quiescent current to below 0.1µA. It can endure voltage surges up to 30 V. The device also features a DFN2535-6 package with a maximum height of 0.6mm, targeting slim battery-protection modules.