ACE4108

Max.2A Li-ion Switching Charger IC

VER 1.1

7

Detailed Description

General description

The ACE4108 is a constant current, constant voltage Li-Ion battery switching charger controller. The

charge current is set by an external sense resistor (R

float voltage is internally set to 4.2V/4.35V per cell. For batteries like lithium-ion that require accurate final

float voltage, the internal reference, voltage amplifier and the resistor divider provide regulation with

±1.5% accuracy.

A charge cycle begins when the voltage at the CHRIN pin rises above the UVLO level and is 250mV

or greater than the battery voltage. At the beginning of the charge cycle, if the battery voltage is less than

the trickle charge threshold, 2.9V for the 4.2 version, the charger goes into trickle charge mode. The

trickle charge current is internally set to 10% of the full-scale current. The charge current is programmable

by setting the value of a precision resistor connected from the ISET pin to ground. The charge current is

1000 times of the current out of the ISET pin. The program resistor and the charge current are calculated

using the following equations:

The charge current out of the BAT pin can be determined at any time by monitoring the ISET pin voltage

using the following equation: