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ADP3404 Datasheet(PDF) 1 Page - Analog Devices |
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ADP3404 Datasheet(HTML) 1 Page - Analog Devices |
1 / 12 page 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. a ADP3404 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001 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 Package APPLICATIONS GSM/DCS/PCS Handsets TeleMatic Systems ICO/Iridium Terminals GSM Power Management System FUNCTIONAL BLOCK DIAGRAM DIGITAL LDO VCC VRTC VTCXO PWRONKEY ROWX PWRONIN RESET ANALOGON POWER-UP SEQUENCING AND PROTECTION LOGIC ADP3404 VBAT REFOUT AGND VCCA RESCAP CHRON SIMBAT CAP+ CAP SIMPROG SIMON SIMGND RESETIN CLKIN DATAIO CHARGE PUMP LOGIC LEVEL TRANSLATION BUFFER REF + I/O RST CLK VSIM RTC LDO XTAL OSC LDO ANALOG LDO DGND GENERAL DESCRIPTION The 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 µA 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 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 back-up capacitor for the real-time clock. These allow an easy interface between ADP3404, 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. |
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