AIC1821

AIC1821 One-Cell Lithium-Ion Battery Protection IC n FEATURES l Reduction in Board Size due to Miniature Package SOT-25 and Less External Components. l Ultra-Low Quiescent Current at 7µA (VCC=3.5V). l Ultra-Low Power-Down Current at 0.6µA (VCC =2.2V). l Precision Overcharge Protection Voltage 4.35V ± 50mV for the AIC1821A 4.30V ± 50mV for the AIC1821B 4.25V ± 50mV for the AIC1821C 4.20V ± 50mV for the AIC1821D l Built-in Delay Time Circuits for Overcharge, Over-discharge, and Overcurrent Protection. l Load Detection Function during Overcharge Mode. l Two Detection Levels for Overcurrent Protection. n APPLICATIONS l Protection IC for One-Cell Lithium-Ion Battery Pack. n DESCRIPTION The AIC1821 battery protection IC is designed to protect lithium-ion battery from damage or degrading the lifetime due to overcharge, overdischarge, and/or overcurrent for one-cell lithium-ion battery powered systems, such as cellular phones. The ultra-small package and less required external components make it ideal to integrate the AIC1821 into the limited space of battery pack. The accurate ±50mV overcharging detection voltage ensures safe and full utilization charging. 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. n TYPICAL APPLICATION CIRCUIT FUSE BATT+ BATTERY M1 SI9926 R1 5 VCC 100 C1 0.1µF 2 GND 3 OD 4 CS OC 1 AIC1821 R3 10M ...