2.5V - 5V

L

C

MIPI eTrak

LM3290

RFIC

or

BBIC

BATTERY

LM3291

LM3291

www.ti.com

SNVSA12 – SEPTEMBER 2013

LM3291 Product Brief

1

FEATURES

DESCRIPTION

The LM3291 is a high-speed linear amplifier that, with

23

•

Highly Programmable High-Current Linear

its

companion

IC

LM3290,

constitutes

an

RF

Amplifier

Envelope Modulator (EM) for supplying 3G/4G Power

•

> 75 MHz Typical Small Signal Bandwidth

Amplifiers (PA) in envelope tracking systems. The

•

Extremely Low Output Impedance

amplifier provides extremely low output impedance

and low output noise over a wide bandwidth.

•

High Linearity

In conjunction with an Envelope Tracking (ET)

•

Differential Analog Input Compatible with

capable RFIC and PA, the LM3291 and LM3290

eTrak 1.0 Standard

greatly improve PA efficiency for 3G and LTE

•

Low Output Noise

operation.

•

When paired with the LM3290 provides a

In ET mode, the LM3291 and LM3290 provide

complete Envelope Modulator solution for

envelope

tracking

supply

voltage

for

the

PA

3G/4G Envelope Tracking Power Amplifiers.

maximizing total EM + PA efficiency. The envelope

•

Automatically controlled through LM3290 in an

modulator follows the differential envelope reference

input signal delivered by the RFIC to the LM3291.

RFFE 1.1-compatible interface.

The output is a single-ended dynamic power supply

voltage to the PA.

APPLICATIONS

The LM3291 supports 3G and LTE operation up to 20

•

3G/LTE Handsets

MHz signal bandwidth.

•

3G//LTE Tablets

The

LM3291’s

programmable

parameters

are

controlled by LM3290 via a direct serial interface

•

3G/LTE Data Cards and Wireless Modems

between the two devices. No additional controls are

needed in the system. This interface provides flexible

control and adjustment options to optimize LM3291

efficiency

and

noise

performance

for

various

frequency bands and power levels.

At high TX output power, the EM can be operated in

ET mode where LM3290 and LM3291 together

modulate the supply of the PA with the envelope

signal to improve overall system efficiency. At low TX

output power, the EM can be transitioned to Average

Power Tracking (APT) mode where LM3291 is placed

into shutdown mode to improve system efficiency.

The LM3291 is available in a 12-pin lead-free DSBGA

package.

For the full datasheet, samples, or the EVM

hardware and software please contact a TI

representative at ET@list.ti.com.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

MIPI is a registered trademark of Mobile Industry Processor Interface Alliance.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.