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Product Information
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500mA USB-Compatible Lithium Ion Battery Charger
Product Profile
 Reference articles
General Description£º
The CN3052A is a complete constant-current /constant voltage linear charger for single cell Li-ion and Li Polymer
rechargeable batteries. The device contains an on-chip power MOSFET and eliminates the need for the external
sense resistor and blocking diode. Furthermore, the CN3052A is specifically designed to work within USB power
specifications. Its low external component count makes CN3052A ideally suited for portable applications.Thermal
feedback regulates the charge current to limit the die temperature during high power operation or high ambient
temperature. The regulation voltage is fixed at 4.2V with 1% accuracy.The charge current can be programmed
externally with a single resistor. When the input supply (wall adapter or USB supply) is removed, the CN3052A
automatically enters a low power sleep mode ,dropping the battery drain current to less than 3uA.Other features
include undervoltage lockout, automatic recharge,chip enable function, battery temperature sensing and a CHRG
pin to indicate charge status.
The CN3052A is available in a thermally enhanced 8-pin SOP package.
Cellular Telephones Digital Still Cameras
MP3 Players Bluetooth Applications
Portable Devices USB Bus-Powered Chargers
Charges Single Cell Li-Ion Batteries Directly from USB Port or AC Adaptor
On-chip Power MOSFET
No external Blocking Diode or Current Sense Resistors Required
Preset 4.2V Regulation Voltage with 1% Accuracy
Precharge Conditioning for Reviving Deeply Discharged Cells and Minimizing Heat Dissipation During Initial Stage
¡¡ of Charge
Continuous Programmable Charge Current Up to 500mA
Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of
¡¡ Overheating
Automatic Low-Power Sleep Mode When Input Supply Voltage is Removed
Status Indication for LEDs or uP Interface
C/10 Charge Termination
Automatic Recharge
Battery Temperature Sensing
Chip Enable Inpu
Available in SOP8 Package
Pb-free Available
Application Note£º
Quick Start of CN31XX Demo Board
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