LP3941 Datasheet, PDF (2/34 Pages) Texas Instruments – Cellular Phone Power Management Unit

LP3941A
OBSOLETE
October 25, 2011
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 regula-
tors, 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 se-
rial interface to program individual regulator output voltages
as well as on/off control.
LP3941 is available in a LLP48 package.
Features
■ ^{11 low dropout, low noise LDOs.}
■ ^{Dedicated low current LDO for real time clock supply.}
■ ^{Back-up battery charger}
■ ^{A constant current / constant voltage battery charger}
controller with charge status indication via I²C compatible
interface.
■ ^{Three open drain drivers to control a RGB LED}
■ ^{I2C compatible serial interface for maximum flexibility}
Applications
■ ^{GSM/EDGE cellular handsets}
■ ^{Wideband CDMA cellular handsets}
Key Specifications
■ ^{3.0V to 5.5V Input Voltage Range}
■ ^{27 µV}_RMS ^{Output noise}
■ ^{2% (typical) Output Voltage Accuracy}
■ ^{1% Charger Voltage Accuracy}
Typical Application
© 2011 Texas Instruments Incorporated 200945
200945 Version 4 Revision 2 Print Date/Time: 2011/10/25 13:09:13
20094501
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