Battery-protection IC with precision voltage detection

January 07, 2016 // By Graham Prophet
Providing single-chip protection for 1-cell lithium-ion (Li+) and lithium-polymer batteries, the AP9214L has been designed for use in rechargeable Li+ battery packs. Targeted at the manufacturers of battery protection modules, the device’s accurate monitoring capability delivers safe charging and discharging, prolonging cell lifetime and minimising energy losses.

The AP9214L co-packages a Li+ protection circuit with a dual N-channel, common-drain MOSFET that can be rapidly 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. The AP9214L also integrates a built-in fixed detection delay time to reduce external component count.

With a low quiescent current, 3.0 µA at +25°C in normal mode (typ), and a MOSFET that has an ultra-low RSS(ON) of 13.5 mΩ (typ), the AP9214L offers significant power-saving benefits. A power-down mode further cuts the quiescent current to below 0.1 µA. The high-voltage CMOS process used to fabricate this device also means it can endure voltage surges up to 30V. An ultra-low profile DFN2535-6 package, with a maximum height of 0.6 mm, allows the AP9214L to be used in slim battery-protection modules.

The AP9214L in the DFN2535-6 package is priced at $0.27 (100,000).

Diodes Inc.;