Single-chip protection IC for 1-Cell Li+ battery packs

December 11, 2015 // By Graham Prophet
The AP9234L (Diodes Inc.) has been designed to provide a high-accuracy, single-chip solution for 1-cell lithium-ion (Li+) or lithium-polymer rechargeable battery packs. Key markets for this device are manufacturers of battery protection circuit modules for consumer electronics equipment.

The AP9234L integrates a high-accuracy battery protection circuit with a dual N-channel common-drain MOSFET that features an ultra-low R SS(ON) (static-source on-resistance) specification, typically 13 mΩ at V DD = 4.0V and I D = 1.0A. Safe battery charging and discharging is achieved by turning the MOSFET off when overcharge voltage/current, over-discharge voltage/current, or load short-circuit conditions are detected. A built-in fixed delay time also protects external components.

Features include stable voltage detection over the full -40° to +85°C operating temperature range, power savings through a low quiescent current, typically 3.0 μA in normal mode and 0.1 μA in power-down mode. An over-current detection voltage compensation circuit assures current limit accuracy. As well as a power-down capability, the AP9234L features a selectable auto-wake up function and offers protection voltage customisation to cater for different cell-type specifications.

In a standard pinout DFN2535-6 package, the AP9234L is priced at $0.41 (10,000).