REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices.

a

ADP3408

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2001

GSM Power Management System

FUNCTIONAL BLOCK DIAGRAM

ADP3408

27

26

BATTERY

CHARGE

CONTROLLER

POWER-UP

SEQUENCING

AND

PROTECTION

LOGIC

SIM

LDO

DIGITAL

CORE LDO

ANALOG

LDO

TCXO

LDO

MEMORY

LDO

RTC

LDO

REF

BUFFER

BATTERY

CHARGE

DIVIDER

VBAT

VBAT2 VRTCIN

PWRONKEY

ROWX

PWRONIN

TCXOEN

SIMEN

RESCAP

CHRDET

EOC

CHGEN

GATEIN

BATSNS

ISENSE

GATEDR

CHRIN

VSIM

VCORE

VAN

VTCXO

VMEM

VRTC

REFOUT

RESET

MVBAT

DGND

AGND

FEATURES

Handles all GSM Baseband Power Management

Six LDOs Optimized for Specific GSM Subsystems

Li-Ion and NiMH Battery Charge Function

Optimized for the AD20msp430 Baseband Chipset

APPLICATIONS

GSM/DCS/PCS/CDMA Handsets

GENERAL DESCRIPTION

The ADP3408 is a multifunction power system chip optimized

for GSM handsets, especially those based on the Analog

Devices AD20msp430 system solution. It contains six LDOs,

one to power each of the critical GSM sub-blocks. Sophisticated

controls are available for power-up during battery charging,

keypad interface, and RTC alarm. The charge circuit maintains

low current charging during the initial charge phase and provides

an end-of-charge signal when a Li-Ion battery is being charged.

The ADP3408 is specified over the temperature range of –20

°C to

+85

°C and is available in narrow body TSSOP-28 pin package.