STW4102 Datasheet, PDF (1/3 Pages) STMicroelectronics – Dual source USB Li-Ion charger with gas gauge

STw4102
Dual source USB Li-Ion charger with gas gauge
Data Brief
Features
■ Constant current constant voltage (CCCV)
charger
■ Dual charging source (main adaptor or USB
cable)
■ Fast charge current control up to 1A for main
adaptor and up to 500mA for USB
■ Internal power device and sense resistor,
option for external components for current
higher than 1A
■ Programmable charge voltage (4.1V, 4.2V,
4.3V, 4.35V) with 1% accuracy
■ Thermal regulation
■ Trickle charge mode at low battery voltage
■ Main adaptor voltage up to 16V
■ Battery overvoltage protection at 4.7V
■ Gas gauge with 13 bit AD converter
■ Battery voltage monitor with 7-12 bit ADC
■ I2C interface for device monitoring and control
■ Charge status output pin
■ Power detection output pin
■ Programmable watchdog security timer
■ 4.7V LDO regulator (external pmos)
Applications
■ Cellular phones (GSM, CDMA, WCDMA),
PDA, MP3 players, cordless phones
■ Digital camera, USB appliances, bluetooth
QFN 24
Plastic Micropackage
Description
The STw4102 is a stand-alone constant-current
constant-voltage (CCCV) linear charger
dedicated for Li-Ion battery.
The STw4102 allows dual charging capability
using the main input adaptor up to 1A (Wall
adaptor, Car adaptor) or USB cable up to 500mA
without external component. Upper 1A charging is
possible by adding just one external transistor.
The STw4102 offers programmable fast charge
current up to 1A with external resistor. A thermal
regulation circuitry limits the charge current
against the die high power dissipation or high
ambient temperature. An end of charge output pin
indicates the charge termination when the fast
charge current drops below 10% of the
programmed current value.
The STw4102 contains an accurate gas gauge
based on a 13 bit AD converter. External resistor
is used between battery and ground to sense a
charge/discharge curent. With a typical 30
mOhms resistor, current can be up to 2.5A.
January 2007
Rev 1
For further information contact your local STMicroelectronics sales office.
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