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STW4102 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. STW4102
Description  Dual source USB Li-Ion charger with gas gauge
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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STW4102 Datasheet(HTML) 1 Page - STMicroelectronics

   
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Data Brief
For further information contact your local STMicroelectronics sales office.
January 2007
Rev 1
1/3
3
STw4102
Dual source USB Li-Ion charger with gas gauge
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
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.
QFN 24
Plastic Micropackage
www.st.com


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