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ADP3401ARU
GSM Power Management System
REV.0
FEATURES
Handles all GSM Baseband Power Management
Functions
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
GSM SIM Modules
Thermally Enhanced 6.1 mm 28-Lead TSSOP Package
APPLICATIONS
GSM/DCS/PCS Handsets
TeleMatic Systems
ICO/Iridium Terminals
GSM Power Management System
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTIONThe 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 mA 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.
ADP3401–SPECIFICATIONS
(–20°C £ TA £ +85°C, VBAT = 3 V to 7 V, CVBAT = CSIMBAT = CVSIM = 10 mF,
CVCC = CVCCA = 2.2 mF, CVRTC = 0.1 mF, CVTCXO = 0.22 mF, CVCAP = 0.1 mF, min. loads applied
on all outputs, unless otherwise noted)
ELECTRICAL CHARACTERISTICS1OPERATING GROUND CURRENT
UVLO CHARACTERISTICS
INPUT CHARACTERISTICS
CHRON CHARACTERISTICS
SHUTDOWN
DIGITAL LDO (VCC)
ADP3401
ADP3401NOTESAll limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.This feature is intended to protect against catastophic failure of the device. Maximum allowed operating junction temperature is 125ºC. Operation beyond 125ºC
could cause permenant damage to the device.Required for stability.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin with Respect
to Any GND Pin . . . . . . . . . . . . . . . . . . . . . .–0.3 V, +10 V
Voltage on Any Pin May Not Exceed VBAT,
with the Following Exceptions: VRTC, VSIM,
CAP+, PWRONIN, I/O, CLK, RST
Storage Temperature Range . . . . . . . . . . . .–65°C to +150°C
Operating Temperature Range . . . . . . . . . . .–20°C to +85°C
Maximum Junction Temperature . . . . . . . . . . . . . . . . .125°CJA, Thermal Impedance (TSSOP-28) . .2-Layer Board 90°C/WJA, Thermal Impedance (TSSOP-28) . .4-Layer Board 60°C/W
Lead Temperature Range (Soldering, 60 sec) . . . . . . . .300°C
*This is a stress rating only, operation beyond these limits can cause the device to
be permanently damaged.
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADP3401 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
PIN CONFIGURATION
PIN FUNCTION DESCRIPTIONS
ORDERING GUIDE
ADP3401
Table I. LDO Control LogicX = Don't care
Bold denotes the active control signal.
VCC
2.765V
DGND
VRTC
2.85V
REFOUT
AGND
VCCA
2.765V
VTCXO
2.765V
VBAT
PWRONKEY
ROWX
PWRONIN
RESCAP
RESET
CHRON
ANALOGON
SIMBAT
CAP+
CAP2
SIMPROG
SIMON
SIMGND
RESETIN
CLKIN
DATAIO
Table II. VSIM Control LogicX = Don't care
