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參數資料
| 型號： | LQA48B |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Cellular Phone Power Management Unit |
| 中文描述： | 蜂窩電話電源管理單元 |
| 文件頁數： | 1/32頁 |
| 文件大小： | 761K |
| 代理商： | LQA48B |
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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.
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 I
2
C
compatible interface.
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
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
20094501
May 2004
L
2004 National Semiconductor Corporation
DS200945
www.national.com
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