ACE4054

Fully integrated constant current/constant voltage

Li-ion battery charger

VER 1.2

1 

Description

The ACE4054 is a single cell, fully integrated constant current (CC) / constant voltage (CV) Li-ion battery

charger. Its compact package with minimum external components requirement makes the ACE4054 ideal

for portable applications.

No external sense resistor or blocking diode is necessary for the ACE4054. Build-in thermal feedback

mechanism regulates the charge current to control the die temperature during high power operation or at

elevated ambient temperature.

The ACE4054 has a pre-charge function for trickle charging deeply discharged batteries. The fast

charge current can be programmed by an external resistor. CV regulation mode is automatically enabled

once the battery’s charging curve reaches the constant voltage portion. The output current then decays

keeps monitoring the battery voltage and enables a new charge cycle once the voltage drops by 150mV

below the CV value.

Power supply state is constantly monitored and the battery drain current is reduced to minimum value

automatically when the ACE4054 sensed a lack of input power. In its shutdown mode, the ACE4054 can

reduce the supply current to less than 25μA. A status pin outputs a logic HIGH/LOW to indicate the

charging status and the presence of power supply.

Other features include charge current monitor, under-voltage lockout.

Features

Without Risk of Overheating

Application