ADP3401 Analog Devices, ADP3401 Datasheet

ADP3401

Manufacturer Part Number

ADP3401

Description

GSM Power Management System

Manufacturer

Analog Devices

Datasheet

1.ADP3401.pdf (12 pages)

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GENERAL DESCRIPTION

The ADP3401 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 ADP3401 ideal for both single cell Li-Ion

and three cell NiMH designs. The current consumption of the

ADP3401 has been optimized for maximum battery life, featuring

a ground current of only 150 A when the phone is in standby

(digital LDO, and SIM card supply active). An undervoltage lock-

out (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 backup battery for the real-time clock.

These allow an easy interface between ADP3401, GSM proces-

sor, charger, and keypad. The 28-lead TSSOP package has been

thermally enhanced to maximize power dissipation capability.

Furthermore, a reset circuit and a thermal shutdown function

have been implemented to support reliable system design.

anyCAP is a 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.

FEATURES

Handles all GSM Baseband Power Management

Four LDOs Optimized for Specific GSM Subsystems

Charges Li-Mn Coin Cell for Real-Time Clock

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

Thermally Enhanced 6.1 mm 28-Lead TSSOP Package

APPLICATIONS

GSM/DCS/PCS Handsets

TeleMatic Systems

ICO/Iridium Terminals

Functions

GSM SIM Modules

GSM Power Management System

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

Tel: 781/329-4700

Fax: 781/326-8703

PWRONKEY

ANALOGON

PWRONIN

SIMPROG

RESETIN

RESCAP

SIMGND

SIMBAT

DATAIO

CHRON

SIMON

ROWX

CLKIN

CAP

CAP+

FUNCTIONAL BLOCK DIAGRAM

ADP3401

TRANSLATION

LOGIC LEVEL

World Wide Web Site: http://www.analog.com

CHARGE

PUMP

SEQUENCING

PROTECTION

POWER-UP

LOGIC

VBAT

AND

I/O

CLK

REF

RST

ADP3401

XTAL OSC

RTC LDO

DIGITAL

ANALOG

BUFFER

LDO

VCC

RESET

VRTC

VTCXO

VCCA

VSIM

REFOUT

DGND

AGND

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