LP3941A Datasheet | National Semiconductor

Description LP3941A is a plete 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 parators and high speed I2C patible serial interface to program individual regulator output voltages as well as on/off control. LP3941 is available in a LLP48 package. n Three open drain drivers to control a RGB LED n I2C patible 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 µVRMS 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 I2C patible interface. Typical Application © 2004 National Semiconductor Corporation DS200945 .national. Connection Diagrams and Package Mark Information 48-Pin Leadless Leadframe Package See NS Package Number LQA48B .. Note: Circle marks pin 1 position. Pin 1 name is N/C. Bottom View Top View Note: The actual physical placement of the package marking will vary from part to part. The package markings “UZYY” designate assembly and manufacturing information. “TT” is a NSC internal code for die traceability. Both will vary considerably. “3941LQA” identifies the device. Package Mark - Top View Ordering Information Order Number LP3941LQ-A LP3941LQX-A Package Marking LP3941LQA LP3941LQA Supplied As 250 units, Tape-and-Reel 2500 units, Tape-and-Reel Note: - See LP3941A register table and LDO programming table for information on the default voltages for LP3941A. .national. Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17...