ACE4054C Datasheet, PDF (1/15 Pages) ACE Technology Co., LTD. – 500mA/1.5A Standalone Linear Li-Ion Battery Charge

ACE4054C
500mA/1.5A Standalone Linear Li-Ion Battery Charge
Description
The ACE4054C 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
ACE4054C ideal for portable applications.
No external sense resistor or blocking diode is necessary for the ACE4054C. Build-in thermal feedback
mechanism regulates the charge current to control the die temperature during high power operation or at
elevated ambient temperature.
The ACE4054C 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
and is finally terminated once the charge current drops to 1/10^th of the programmed value. The
ACE4054C 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 ACE4054C senses a lack of input power. In its shutdown mode, the ACE4054C
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
 Standalone Capability with no Requirement of External MOSFET, Sense Resistor or Blocking Diode
 Complete Linear Charger in Compact Package for Single Cell Lithium-Ion Batteries
 Programmable Pre-charge, Fast Charge and Termination Current
 Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate
Without Risk of Overheating
 Charges Single Cell Li-Ion Batteries Directly from USB Port
 Preset 4.2V Charge Voltage with ±1% Accuracy
 Automatic Recharge
 Charge Status Output Pin
 C/10 Charge Termination
 25μA Supply Current in Shutdown
 2.9V Trickle Charge Threshold
 Soft-Start Limits Inrush Current
Application
 Cellular Telephones,PDAs,MP3 Players
 Charging Docks and Cradles
 Bluetooth Applications
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