Precision voltage detection enables longer cell life

6th January 2016

Nat Bowers

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Datasheet

Designed specifically for use in rechargeable Li+ battery packs, such as in portable electronics, the AP9214L has been introduced by Diodes Incorporated. Providing single-chip protection for 1-cell Li+ and lithium-polymer batteries, 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 typical quiescent current, 3.0µA at +25°C in normal mode, and a MOSFET that boasts an ultra-low typical RSS(ON) of 13.5mΩ, the AP9214L offers significant power-saving benefits. A power-down mode further cuts the quiescent current to below 0.1µA. 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 0.6mm, allows the AP9214L to be used in slim battery-protection modules.

Supplied in a DFN2535-6 package, the AP9214L is priced at $0.27 each in 100,000 unit quantities.