STW4102 datasheet(1/34 Pages) STMICROELECTRONICS

部件名	STW4102

功能描述	Dual USB/wall adapter Li-ion battery charger with gas gauge

PDF	34 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 34 page

March 2008

Rev 2

1/34

34

STw4102

Dual USB/wall adapter Li-ion battery charger with gas gauge

Features

■ Constant current constant voltage (CCCV)

linear charger

■ Common or separate USB/wall adapter inputs

■ Fast charge current control up to 1 A for wall

adapter and up to 500 mA for USB

■ Support for currents higher than 1 A using

external components

■ Programmable charge voltage (4.1 V, 4.2 V,

4.3 V, 4.35 V) with 1% accuracy

■ Thermal regulation

■ Trickle charge mode at low battery voltage

■ Wall adapter voltage up to 16 V

■ Battery overvoltage protection at 4.7 V

■ Gas gauge with 13-bit AD converter

■ Battery voltage monitor with 7-12 bit AD

converter

■ I2C interface for device monitoring and control

■ Charge status output pin

■ Power detection output pin

■ Programmable watchdog security timer

■ 4.7 V LDO regulator (with external power

MOSFET)

Applications

■ Cellular phones (GSM, CDMA, WCDMA),

PDA, MP3 players, cordless phones

■ Digital camera, USB appliances, bluetooth

devices, portable navigation devices

Description

The STw4102 is a standalone constant current

constant voltage (CCCV) linear charger

specifically designed for Li-ion batteries.

The STw4102 offers dual charging capability

using separate inputs for USB cable and wall

adapter, or a single input that accepts both.

The STw4102 also offers programmable fast

charge current using an external resistor. A

thermal regulation circuit 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 includes an accurate gas gauge

based on a 13-bit AD converter. An external

resistor is used between battery and ground to

sense a charge/discharge current. With a typical

30 m

Ω resistor, current can be up to 2.5 A.

QFN 24

(Plastic micropackage)

1

2

3

4

5

6

18

17

16

15

14

13

24 23 22 21 20 19

78

9 10 11 12

MAIN

VOUT

USBPWR

DRIVER

LDODRV

LDOFB

VIO

SCL

SDA

RESETN

STDBY

C32KHZ

Pin connections

(top view)

www.st.com

类似零件编号 - STW4102

制造商	部件名	数据表	功能描述
STMicroelectronics	STW4102	117Kb / 3P	Dual source USB Li-Ion charger with gas gauge 11-Jan-2007
STMicroelectronics	STW4102IQT	117Kb / 3P	Dual source USB Li-Ion charger with gas gauge 11-Jan-2007

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类似说明 - STW4102

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