AIC1804

AIC1804 Three- Or Four-Cell Lithium-Ion Battery Protection IC n FEATURES l n DESCRIPTION The AIC1804 is designed to protect the lithiumion battery from damage or degrading the lifetime due to overcharging, overdischarging and overcurrent for three- or four-cell lithium-ion battery powered systems such as notebook PCs. It can also provide the cell-balancing “bleeding” function to automatically discharge the overcharged cell until the overcharge condition is released. Safe and full utilization charging is ensured by the accurate ± 30mV overcharge detection. Four different specification values for overcharge protection voltage are provided for various protection requirements. The very low standby current drains little current from the cell while in storage. Cell Number Selection Function to Select 3 or 4 cells Protection. Ultra-Low Quiescent Current at 17 µA (4-Cell, VCELL=3.5V). Ultra-Low Power-Down Current at 2.2µA (4-Cell, VCELL=2.3V) Wide Supply Voltage Range: 2V to 18V. Precision Overcharge Protection Voltage: 4.35V ± 30mV for the AIC1804A 4.30V ± 30mV for the AIC1804B 4.25V ± 30mV for the AIC1804C 4.20V ± 30mV for the AIC1804D Externally Set Overcharge, Overdischarge and Overcurrent Delay Time. Built-in Cell-balancing Bleeding Network under Overcharge Condition. Three Detection Levels for Overcurrent Protection. l l l l l l l n l APPLICATIONS Protection IC for Three- or Four-Cell Lithium-Ion Battery Packs. n TYPICAL APPLICATION CIRCUIT R8 1K 1 16 NSL VCC R1...