Enhance the safety of 1-cell lithium-ion battery packs

26th January 2016

Nat Bowers

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Datasheet

Designed for the safe operation of 1-cell Li-ion battery packs, Diodes Incorporated has introduced a battery protection device aimed at the manufacturers of protection circuit modules who supply the battery pack makers. The AP9211 combines a protection chip with a dual N-channel MOSFET to provide a rich set of features that include overcharge, over-discharge and load short-circuit detection.

The AP9211 co-packages a battery protection chip and a standard dual N-channel common-drain MOSFET in a small 3x2mm 6-pin package. The low profile (under 0.6mm) of the U-DFN2030-6 package helps achieve a slimmer protection circuit board design, which in turn allows for larger battery capacities for a given battery size. By continually monitoring voltage and current, the chip can rapidly turn off the MOSFET to prevent overcharging or excessive discharge conditions, including load short circuit.

Further benefits of the AP9211 are the use of a high voltage (up to 30V) CMOS process that can endure surge voltages. The process also enables high accuracy voltage detection with stable temperature coefficient performance. The device achieves power savings from its low quiescent operating current, typically 3.0μA in normal mode and 0.1μA maximum in power-down mode. The device's built-in fixed delay time reduces the need for external components.

The AP9211 is priced at $0.19 each in 10,000 unit quantities.