LP3941A Datasheet, PDF (1/32 Pages) National Semiconductor (TI) – Cellular Phone Power Management Unit

May 2004
LP3941A
Cellular Phone Power Management Unit
General Description
LP3941A is a complete power management IC designed for
a cellular phone. It contains 11 low noise low dropout regu-
lators, a linear charger for Li-Ion battery, a backup battery
charger, real time clock supply regulator, three open drain
drivers, two comparators and high speed I²C compatible
serial interface to program individual regulator output volt-
ages as well as on/off control.
LP3941 is available in a LLP48 package.
Features
n 11 low dropout, low noise LDOs.
n Dedicated low current LDO for real time clock supply.
n Back-up battery charger
n A constant current / constant voltage battery charger
controller with charge status indication via I²C
compatible interface.
n Three open drain drivers to control a RGB LED
n I²C compatible serial interface for maximum flexibility
Applications
n GSM/EDGE cellular handsets
n Wideband CDMA cellular handsets
Key Specifications
n 3.0V to 5.5V Input Voltage Range
n 27 µV_RMS Output noise
n 2% (typical) Output Voltage Accuracy
n 1% Charger Voltage Accuracy
Typical Application
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