a CDMA Power Management System
Preliminary Technical Data ADP3500
FEATURES
Handles all CDMA Baseband and RF/IF Power Management
Functions
LDOs Optimized for Specific CDMA Subsystems
Four Backup LDOs for Stand-By mode operation
Four Li-Ion Battery Charge Modes
5mA Pre Charge
Low Current Charge
Full Current Charge
Regulator mode (no current limit)
Ambient Temperature: -30 °Cto+85°C
64pin 7x7 LQFP package
APPLICATIONS
CDMA/CDMA2000/PCS Handsets
GENERAL DESCRIPTION
The ADP3500 is a multifunction power system chip optimized
for CDMA cell phone power management. It contains 15 LDOs.
Sophisticated controls are available for power up during battery
charging, keypad interface, GPIO/INT function and RTC
function. The battery charger has four modes as Pre-charge, Low
Current Charge, Full Current Charge, and Regulator modes, and
is designed for Li-Ion/Li-Polymer batteries.
REV. PrP 2/6/02
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 apatent rights of Analog Devices.
RESET OUTPUT
RESET
32KHz OUTPUT
CONTROL
POWER ON
KEYPAD I/F
GPIO
SERIAL I/F
DELAY 10mS
INTERRUPT
CONTROL
LDO CONTROL
BATTERY
CHARGER
REFERENCE
LDO1 to 11
VOLTAGE
DETECTOR
ANALOG
BLOCK
RTC COUNTER
STAY-ALIVE
TIMER
LOGIC
BLOCK
ADP3500
Figure 1. Functional Block Diagram
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