ACE4054 Datasheet, PDF (1/15 Pages) ACE Technology Co., LTD. – Fully integrated constant current/constant voltage Li-ion battery charger

ACE4054
Technology
Fully integrated constant current/constant voltage
Li-ion battery charger
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
and is finally terminated once the charge current drops to 1/10^th of the programmed value. The ACE4054
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
• 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
• Available in SOT-23-5 Package
Application
• Cellular Telephones,PDAs,MP3 Players
• Charging Docks and Cradles
• Bluetooth Applications
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