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 PackageApplicationGSM/DCS/PCS Handsets
TeleMatic Systems
ICO/Iridium TerminalsPinout
SpecificationsVoltage on Any Pin with Respect to Any
GND Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.3 V, +10 V
Voltage on Any Pin May Not Exceed VBAT, with theFollowing
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°C
JA, Thermal Impedance (TSSOP-28) . . 4-Layer Board 68°C/W
JA, Thermal Impedance (TSSOP-28) . . 6-Layer Board 62°C/W
Lead Temperature Range (Soldering, 60 sec) . . . . . . . .300°C
DescriptionThe 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 A 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 ADP3404 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 available 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 processor, charger, and keypad. Furthermore, a reset circuit and a thermal shutdown function have been implemented to support reliable system design.
ADP3404 Data Sheet
