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LQA48B Datasheet

  • LQA48B

  • Cellular Phone Power Management Unit

  • 32頁(yè)

  • NSC

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LP3941A 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 I
2
C compatible
serial interface to program individual regulator output volt-
ages as well as on/off control.
LP3941 is available in a LLP48 package.
n
Three open drain drivers to control a RGB LED
n
I
2
C compatible serial interface for maximum flexibility
Applications
n
GSM/EDGE cellular handsets
n
Wideband CDMA cellular handsets
Key Specifications
n
n
n
n
3.0V to 5.5V Input Voltage Range
27 碌V
RMS
Output noise
2% (typical) Output Voltage Accuracy
1% Charger Voltage Accuracy
Features
n
n
n
n
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 I
2
C
compatible interface.
Typical Application
20094501
漏 2004 National Semiconductor Corporation
DS200945
www.national.com

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