ADP3522

GSM Power Management System ADP3522 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 ؋ 5 mm LFCSP-32 APPLICATIONS GSM/GPRS Handsets PWRONKEY ROWX FUNCTIONAL BLOCK DIAGRAM VBAT VBAT2 VRTCIN POWER-UP SEQUENCING AND PROTECTION LOGIC SIM LDO VSIM SIMVSEL DIGITAL CORE LDO VCORE GENERAL DESCRIPTION PWRONIN ANALOG LDO TCXOEN SIMEN RESCAP MEMORY LDO RTC LDO REF BUFFER VMEM TCXO LDO VAN 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 powerup 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 ϫ 5 mm and yet offers excellent thermal performance due to the exposed die attached paddle. The ADP3522 is specified over the temperature range of –20°C to +85°C. VTCXO VRTC REFOUT RESET CHRDET EOC CHGEN BATSNS ISENSE GATEIN CHRIN GATEDR AGND BATTERY CHARGE CONTROLLER...