LP3918TL-I

更新时间： 2024-11-15 13:01:59

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LP3918TL-I 数据手册

October 2007

LP3918

Battery Charge Management and Regulator Unit

General Description

Features

■

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.

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

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.

I2C compatible interface for controlling LDO outputs and

charger operation

■

Thermal shutdown

■

Under Voltage Lockout

LDO regulators provide high PSRR and low noise ideally suit-

ed for supplying power to both analog and digital loads.

25-bump Thin micro-SMD package 2.5 x 2.5 mm

Options available on request, please contact sales office

for further information;

Applications

- Level detect on HF_PWR & PWR_ON

- LDO Charging mode

- Custom Default Settings on Charger, and LDO O/P's.

CDMA Phone Handsets

■

Low Power Wireless Handsets

Handheld Information Appliances

Personal Media Players

Key Specifications

Digital Cameras

■

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

20211601

202116

www.national.com

12 3 4 5 6 7...30

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