LMV243

Single-Channel, Quad-Band GSM Power Controller in

micro SMD

General Description

The device is intended for use within an RF transmit power

control loop in GSM mobile phones and supports GaAs HBT

and bipolar RF single supply power amplifiers. The circuit

operates with a single supply from 2.7V to 3.3V.

The LMV243 contains an RF detector, error amplifier, ramp

V/I converter and output driver. The LMV243 input interface

consists of the RF input, Ramp voltage, and a digital input to

perform the function ’Shutdown/Transmit Enable’. The de-

vice will be active in the case TX_EN = HI, otherwise, the

device goes into a low power consumption shutdown mode.

During shutdown the output will be in high impedance

(tri-state).

A single external RC combination is used to provide stable

operations that accommodates individual PA characteristics.

The LMV243 is offered in a 8-bump micro SMD 1.5mm x

1.5mm package. This space savings package supports flex-

ible product placement almost anywhere in the circuitboard.

Features

(Typical Unless Otherwise Noted)

n

50dB RF detection range (typical)

n

micro SMD package 1.5mm x 1.5mm x 0.995mm

n

Support of GaAs HBT, bipolar technology

n

Quad-band operation

n

Shutdown mode for Power Save in Rx slot

n

GPRS compliant

n

External loop compensation option

n

Accurate temperature compensation

n

Frequency range is 450MHz to 2GHz

Applications

n

GSM mobile phone

n

AGC for digital audio

n

TDMA RF control

n

Wireless LAN

Typical Application

20029034

May 2002

© 2002 National Semiconductor Corporation

DS200290

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