Single-chip protection IC suitable for 1-cell Li+ battery packs
Offering a substantial set of protection features, the AP9234L IC introduced by Diodes Incorporated is specifically designed to provide a high-accuracy, single-chip solution for 1-cell Li-ion or lithium-polymer rechargeable battery packs. Key markets for this device are manufacturers of battery protection circuit modules for smart phones, cameras and similar 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 RSS(ON) specification, typically just 13mΩ at VDD = 4.0V and ID = 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.
Stable voltage detection over the full -40 to +85°C operating temperature range is ensured by Diodes Incorporated’s innovative design and process technology, which also delivers power savings through a low quiescent current, typically 3.0μA in normal mode and 0.1μA in power-down mode. Additionally, 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.
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