TX4054
TX4054 is a complete CC/CV linear charger for single cell lithium-ion batteries. it is specifically designed to work within USB power Specifications.
No external sense resistor is needed and no blocking diode is required due to the internal P-MOSFET architecture.Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature .The charge voltage is fixed at 4.2V,and the charge current can be programmed externally with a single resistor. The TX4054 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.
When the input supply (wall adapter or USB supply) is removed the TX4054 automatically enters a low current state dropping the battery drain current to less than 2μA.The TX4054 can be put into shut down mode reducing the supply current to 55μA.
Other features include Battery temperature monitor, under-voltage lockout, automatic recharge and two status pins to indicate charge and charge termination.
Features
Programmable charge current up to 800mA
No MOSFET sense resistor or blocking diode required
Complete linear Charger for single Cell Lithium-Ion Batteries
CC and CV operation with thermal regulation to maximize Rate without risk of overheating
Preset 4.2V charge voltage with ±1% accuracy
Automatic Recharge
C/10 charge termination
2.9V trickle current charge threshold
Soft-Start limits inrush current
Available in SOT23-5 package
Applications
Cellular Telephones
Mobile Power Supply
Digital Still Cameras
MP3 Players
Bluetooth Applications
Portable Devices
USB Bus-Powered Chargers
