DESCRIPTION
A4057 series is a double lithium battery charge management chip. The chip includes a charge state detection, the charging process, temperature detection and so on. The chip also integrates a high-precision reference voltage module in it.
A4057 charge contains three modes: precharge, constant current charging, constant voltage charging. Constant current charging current is five times the pre-charge current; when the voltage is lower than 6.5V into the precharge mode; when the voltage is above 6.5V into the constant current charge mode, the charging current is five times as the precharge, the charging current is determined by an external resistor.

FEATURES
⚫ Double lithium battery charge management
⚫ Only need a few external comp o nents
⚫ Pre charge, c onstant current charging , constant
voltage charging mode
⚫ Temperature detection
⚫ Two charging status
⚫ Available i n SOP8 p a ckage

APPLICATION
⚫ Digital camera
⚫ PDAS
⚫ The phone lithium battery