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ADP3522
GSM Power Management System
FEATURES
Handles all GSM Baseband Power Management
6 LDOs Optimized for Specific GSM Subsystems
Li-Ion Battery Charge Function
Optimized for the AD20msp430 Baseband Chipset
Reduced Package Size: 5 mm H11547 5 mm LFCSP-32
APPLICATIONS
GSM/GPRS Handsets
FUNCTIONAL BLOCK DIAGRAM
PWRONKEY
PWRONIN
TCXOEN
CHRDET
EOC
BATSNS
VRTCIN
ROWX
CHGEN
ISENSE
CHRIN
RESCAP
VBAT VBAT2
POWER-UP
SEQUENCING
AND
PROTECTION
LOGIC
SIMEN
SIMVSEL
DGND
VCORE
AGND
MVBAT
VTCXO
VAN
VMEM
VRTC
REFOUT



VSIM
GATEDR
GATEIN
RESET
ADP3522
SIM
LDO
DIGITAL
CORE LDO
ANALOG
LDO
TCXO
LDO
MEMORY
LDO
RTC
LDO
REF
BUFFER
BATTERY
VOLTAGE
DIVIDER
BATTERY
CHARGE
CONTROLLER
GENERAL DESCRIPTION
The ADP3522 is a multifunction power system chip optimized
for GSM/GPRS handsets, especially those based on the Analog
Devices AD20msp430 system solution with 1.8 V digital
baseband processors, such as the AD6525, AD6526, and
AD6528. It contains six LDOs, one to power each of the critical
GSM subblocks. 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 (EOC) signal
when a Li-Ion battery is being charged. This product also meets
the market trend of reduced size with a new LFCSP package.
Its footprint is only 5 mm H11003 5 mm and yet offers excellent ther-
mal performance due to the exposed die attached paddle.
The ADP3522 is specified over the temperature range of
–20°C to +85°C.