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 I 2C compatible interface. Three open drain drivers to control a RGB LED I 2C compatible serial interface for maximum flexibility Description LP3941A is a complete power management IC designed for a cellular phone. It contains 11 low noise low dropout regulators, 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 2C compatible serial interface to program individual regulator output voltages as well as on/off control. LP3941 is available in a LLP48 package. Key Specification 3.0V to 5.5V Input Voltage Range 27 µVRMS Output noise 2% (typical) Output Voltage Accuracy 1% Charger Voltage Accuracy Applications GSM/EDGE cellular handsets Wideband CDMA cellular handsets

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LP3941 Cellular Phone Power Management Unit	1322 Kbytes	25-Oct-11

Application Notes

Title		Size	Date	Other Language
	AN-1296: Application Note 1296 LP3945/LP3946 Evaluation Kit	280 Kbytes	17-Sep-04
	AN-1300: Application Note 1300 LP3943 Evaluation Kit	466 Kbytes	20-Oct-04
	AN-1341: Application Note 1341 LP3947 Evaluation Board	584 Kbytes	18-Nov-04
	AN-1344: Application Note 1344 LP3944 Evaluation Kit	366 Kbytes	20-Oct-04
	AN-1715: Application Note 1715 LP3943/LP3944 as a GPIO Expander	93 Kbytes	12-Oct-07	中文