ADP3405 Analog Devices, ADP3405 Datasheet

ADP3405

Manufacturer Part Number

ADP3405

Description

GSM Power Management System

Manufacturer

Analog Devices

Datasheet

1.ADP3405.pdf (12 pages)

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GENERAL DESCRIPTION

The ADP3405 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 ADP3405 ideal for both single cell Li-Ion

and three cell NiMH designs. The current consumption of the

ADP3405 has been optimized for maximum battery life, featuring

a ground current of only 150 µA 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 ADP3405, GSM proces-

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

thermal shutdown function have been implemented to support

reliable system design.

anyCAP is a registered trademark of Analog Devices, Inc.

GSM Power Management System

PWRONKEY

ANALOGON

PWRONIN

SIMPROG

RESETIN

RESCAP

SIMGND

SIMBAT

DATAIO

CHRON

SIMON

ROWX

CLKIN

CAP

CAP+

FUNCTIONAL BLOCK DIAGRAM

ADP3405

TRANSLATION

LOGIC LEVEL

CHARGE

PUMP

SEQUENCING

PROTECTION

POWER-UP

VBAT

LOGIC

AND

I/O

CLK

REF

RST

ADP3405

XTAL OSC

BUFFER

RTC LDO

DIGITAL

ANALOG

LDO

VCC

RESET

VRTC

VTCXO

VCCA

VSIM

REFOUT

DGND

AGND

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