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ADP3404

GSM Power Management System

Analog Devices 

a

GSM Power Management System

ADP3404

FEATURES

Handles all GSM Baseband Power Management

Functions

Four LDOs Optimized for Specific GSM Subsystems

Charges Back-Up Capacitor for Real-Time Clock

Charge Pump and Logic Level Translators for 3 V and 5 V

GSM SIM Modules

Narrow Body 4.4 mm 28-Lead TSSOP Package

APPLICATIONS

GSM/DCS/PCS Handsets

TeleMatic Systems

ICO/Iridium Terminals

GENERAL DESCRIPTION

The ADP3404 is a multifunction power management system IC

optimized for GSM cell phones. The wide input voltage range of

3.0 V to 7.0 V makes the ADP3404 ideal for both single cell

Li-Ion and three cell NiMH designs. The current consumption

of the ADP3404 has been optimized for maximum battery life,

featuring a ground current of only 230 µA when the phone is in

standby (digital LDO, analog LDO, and SIM card supply active).

An undervoltage lockout (UVLO) prevents the startup when

there is not enough energy in the battery. All four integrated

LDOs are optimized to power one of the critical sub-blocks of the

phone. Their novel anyCAP® architecture requires only very

small output capacitors for stability, and the LDOs are insensitive

to the capacitors’ equivalent series resistance (ESR). This makes

them stable with any capacitor, including ceramic (MLCC) types

for space-restricted applications.

A step-up converter is implemented to supply both the SIM

module and the level translation circuitry to adapt logic signals

for 3 V and 5 V SIM modules. Sophisticated controls are avail-

able for power-up during battery charging, keypad interface and

charging of an auxiliary back-up capacitor for the real-time clock.

These allow an easy interface between ADP3404, GSM proces-

sor, charger, and keypad. Furthermore, a reset circuit and a

thermal shutdown function have been implemented to support

reliable system design.

FUNCTIONAL BLOCK DIAGRAM

VBAT

ADP3404

DIGITAL

LDO

PWRONKEY

ROWX

PWRONIN

ANALOGON

RESCAP

CHRON

SIMBAT

CAP+

CAP؊

SIMPROG

SIMON

SIMGND

RESETIN

CLKIN

DATAIO

POWER-UP

SEQUENCING

AND

PROTECTION

LOGIC

RTC LDO

XTAL OSC

LDO

ANALOG

LDO

CHARGE

PUMP

LOGIC LEVEL

TRANSLATION

REF

+

BUFFER

I/O CLK RST

VCC

RESET

VRTC

VTCXO

VCCA

VSIM

REFOUT

DGND

AGND

anyCAP is a registered trademark of Analog Devices, Inc.

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

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

otherwise under any patent or patent rights of Analog Devices.

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

Tel: 781/329-4700

World Wide Web Site: www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2001

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