LP3939

Power Amplifier Driver for Dual Band CDMA Handsets

General Description

Designed

specifically

for

Qualcomm’s

MSM3xxx

and

MSM5xxx series, the LP3939 is an integrated device that

provides interface to the baseband processor to power-

switch two independent power amplifiers in dual band appli-

cations. By integrating the discrete components necessary

to achieve the same functions, the LP3939 drastically re-

duces board space and component cost.

Features

n

Power-switch for dual band CDMA power amplifier

Key Specifications

n

0.002 µA Quiescent Current (typ)

n

LLP16 Package

Applications

n

Dual-band CDMA phones with MSM3xxx or MSM5xxx

platform

LP3939 Application Circuit

20083101

Note: This application circuit shows the connection interface to a typical Skyworks PA. Connections to other PA vendors may vary slightly.

November 2003

© 2003 National Semiconductor Corporation

DS200831

www.national.com