ADP3502

a FEATURES 11 LDOs Optimized for Specific CDMA Subsystems 4 Backup LDOs for Standby Mode Operation Ultra Low Standby Supply Current High Accuracy Battery Charger (0.7%) 3 Li-Ion Battery Charge Modes 5 mA Precharge Low Current Charge Full Current Charge Integrated RTC Ambient Temperature: –30؇C to +85؇ C 64-Lead 7 mm ؋ 7 mm ؋ 1 mm TQFP Package APPLICATIONS CDMA/CDMA2000/PCS Handsets CDMA Power Management System ADP3502 FUNCTIONAL BLOCK DIAGRAM LOGIC BLOCK POWER ON DELAY 10ms ANALOG BLOCK BATTERY CHARGER KEYPAD I/F INTERRUPT CONTROL LDO CONTROL REFERENCE GPIO LDO1 TO LDO11 SERIAL I/F RESET VOLTAGE DETECTOR 32kHz OUTPUT CONTROL RTC COUNTER GENERAL DESCRIPTION RESET OUTPUT ADP3502 STAY-ALIVE TIMER The ADP3502 is a multifunction chip optimized for CDMA-1x cell phone power management. It offers a total power solution for the handset baseband and RF section, including LDOs to power 11 subsystems. Also integrated are a real-time clock (RTC), serial bus interface, and charging control for Li-Ion/ Li-Polymer batteries. Sophisticated controls are available for power-up during battery charging, keypad interface, GPIO/INT function, and RTC function. The ADP3502 is optimized for CDMA handsets powered by single-cell Li-Ion batteries. Its high level of integration significantly reduces the design effort, number of discrete components, and solution size/cost. The main-sub LDO structure reduces the standby current consumption, and as a result, greatly extends the standby time of...