LP3918TLX-A+ National Semiconductor, LP3918TLX-A+ Datasheet

LP3918TLX-A+

Manufacturer Part Number

LP3918TLX-A+

Description

Manufacturer

National Semiconductor

Datasheets

1.LP3918TLX-A.pdf (32 pages)

2.LP3918TLX-A.pdf (30 pages)

Specifications of LP3918TLX-A+

Notes

NEW

Date_code

10+

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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

■

Simplified Functional Block Diagram

CDMA Phone Handsets

Low Power Wireless Handsets

Handheld Information Appliances

Personal Media Players

Digital Cameras

202116

LP3918

Features

■

Key Specifications

■

Fully integrated Li-Ion battery charger with thermal

regulation

USB Charge Mode.

7 Low Noise LDO’s

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.

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

2 x 300 mA

3 x 150 mA

2 x 80 mA

20211601

April 28, 2009

www.national.com

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