STW4102 datasheet(16/34 Pages) STMICROELECTRONICS

Nome de Peças	STW4102

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

PDF	34 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

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16 / 34 page

Application schematics

STw4102

16/34

5.3

Using LDO regulator to supply telephone from wall adapter

The regulator with external power PMOS (M1) supplies the telephone while the battery is

discharged or unplugged. When the charger is unplugged, the phone is supplied by the

battery through Power MOS M2. A Schottky diode (D1) avoids reverse current.

Figure 18.

Charge power path and regulator

Table 10.

Component list for LDO regulator

Name

Typ. value

Tolerance

Comments

M1 + D1

STS2DPFS20V

PMOS transistor with Schottky diode

STT5PF20V

PMOS transistor

10µF to 22µF

An output capacitor Co of at least 10µF is required.

An input capacitor C4 equal to or larger than Co is

required on MAIN input.

To phone

Indicator LED

Battery voltage

32kHz

Rset

Rcg

StandBy

Reset

IO voltage

STw4102

VOUT

SENSE

BATT

BATTSENSE

ISET

CVIS

C32KHZ

STDBY

ICG+

ICG-

GND

RESETN

SDA

SCL

VIO

LDOFB

LDODRV

CVREF

EOCHG

PWRDETECTN

MAIN

USBPWR

DRIVER

Co >= 15uF

to power

management

TEST

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