STC4054 Datasheet, PDF (1/17 Pages) STMicroelectronics – 800mA Standalone linear Li-Ion Battery charger with thermal regulation

STC4054
800mA Standalone linear Li-Ion
Battery charger with thermal regulation
Feature summary
■ Programmable charge current up to 800mA
■ No external MOSFET, sense resistors or
blocking diode required
■ 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
■ Single charge status output pin
■ Charge current monitor output for gas gauging
■ C/10 Charge termination
■ 25µA supply current in shutdown mode
■ Low battery voltage detect for precharge
setting
■ Soft-start limits inrush current
■ TSOT23-5L package
Applications
■ Cellular telephones
■ PDAs
■ Bluetooth applications
■ Battery-powered devices
Description
The STC4054 is a constant current/constant
voltage charger for single cell Li-Ion batteries. No
external sense resistor or blocking diode is
TSOT23-5L
required and its ThinSOT package make it ideally
suited for portable applications.
The STC4054 is designed to work within USB
power specifications. An internal block regulates
the current when the junction temperature
increases, in order to protect the device when it
operates in high power or high ambient
temperature.
The charge voltage is fixed at 4.2V, and the
charge current limitation can be programmed
using a single resistor connectd between PROG
pin and GND. The charge cycle is automatically
terminated when the current flowing to the battery
is 1/10 of the programmed value. If the external
adaptor is removed, the STC4054 turns off and a
2µA current can flow from the battery to the
device. The device can be put into Shutdown
Mode, reducing the supply current to 25µA. The
device also has a charge current monitor, under
voltage lockout, automatic recharge. The device is
packaged in TSOT23-5L.
Order code
Part number
STC4054GR
September 2006
Package
TSOT23-5L
Rev. 1
Packaging
3000 parts per reel
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