LP3918 Datasheet, PDF (1/30 Pages) National Semiconductor (TI) – Battery Charge Management and Regulator Unit

October 2007
LP3918
Battery Charge Management and Regulator Unit
General Description
The LP3918 is a fully integrated charger and multi-regulator
unit designed for CDMA cellular phones. The LP3918 con-
tains a Li-Ion battery charger, 7 low noise low dropout (LDO)
voltage regulators and a high-speed serial interface to pro-
gram on/off conditions and output voltages of individual reg-
ulators, and also to read status information from the PMU.
The Li-Ion charger integrates a power FET, reverse current
blocking diode, sense resistor with current monitor output,
and requires only a few external components. Charging is
thermally regulated to obtain the most efficient charging rate
for a given ambient temperature.
LDO regulators provide high PSRR and low noise ideally suit-
ed for supplying power to both analog and digital loads.
Applications
■ ^{CDMA Phone Handsets}
■ ^{Low Power Wireless Handsets}
■ ^{Handheld Information Appliances}
■ ^{Personal Media Players}
■ ^{Digital Cameras}
Features
■ ^{Fully integrated Li-Ion battery charger with thermal}
regulation
■ ^{USB Charge Mode.}
■ ^{7 Low Noise LDO’s}
2 x 300 mA
3 x 150 mA
2 x 80 mA
■ ^{I2C compatible interface for controlling LDO outputs and}
charger operation
■ ^{Thermal shutdown}
■ ^{Under Voltage Lockout}
■ ^{25-bump Thin micro-SMD package 2.5 x 2.5 mm}
■ ^{Options available on request, please contact sales office}
for further information;
- Level detect on HF_PWR & PWR_ON
- LDO Charging mode
- Custom Default Settings on Charger, and LDO O/P's.
Key Specifications
■ ^{50mA to 950mA Programmable Charge Current}
■ ^{3.0V to 5.5V Input Voltage Range}
■ ^{200mV typ. Dropout Voltage on 300 mA LDO’s}
■ ^{2% (typ) Output Voltage Accuracy on LDO’s}
Simplified Functional Block Diagram
© 2007 National Semiconductor Corporation 202116
20211601
www.national.com