2.5V - 5V

L

C

MIPI eTrak

LM3290

RFIC

or

BBIC

BATTERY

LM3291

LM3290

www.ti.com

SNVSA11 – AUGUST 2013

LM3290 Product Brief

1

FEATURES

DESCRIPTION

The LM3290, with its companion IC LM3291, is an

2

•

RF envelope supply modulator (EM) with integrated

–

DC-DC boost converter optimized for Envelope

–

Tracking (ET) RF power amplifiers (PAs). The device

enables maximum transmit output power independent

•

DC BOOST FOR ET OPERATION:

of the input battery voltage (battery as low as 2.5 V)

–

Boost Input Voltage Range: 2.5 V to 5 V

–

High-Efficiency (90% typical) with Internal

The LM3290 operates in two active modes:

Synchronous Rectification

1. For low TX output power, LM3290 may operate in

–

Boost Bypass Function with Low

Average Power Tracking (APT) mode, providing a

Resistance (150 m

Ω typ.)

static, but programmable, output voltage to

–

2.7 MHz PWM Switching Frequencies

supply the PA. At light load and in APT mode, the

LM3290 enters into Pulse Frequency Mode

•

BUCK DC-DC FOR APT AND ET OPERATION:

(PFM) operation automatically and operates with

–

High Operating Frequency for Small

reduced switching frequency. In PFM mode, the

External Inductors and Capacitors

quiescent current is reduced, which extends the

–

battery life.

2. In ET mode, the LM3290 with LM3291 efficiently

–

High-Efficiency (95% typical) with Internal

provides

a

dynamic,

high-bandwidth

supply

voltage for the PA to maximize total EM + PA

Synchronous Rectification

efficiency. The envelope modulator follows the

–

Low-Power PFM Mode

envelope reference input signal delivered by the

•

LM3291 CONTROL:

RFIC to the LM3291 via a differential analog

–

Automatic Control of LM3291 in ET Mode

input. The output is a single-ended power supply

signal to the PA.

•

RFFE CONTROL INTERFACE:

The LM3290 and LM3291 support 3G, as well as LTE

–

operation up to 20-MHz signal bandwidth.

Control Interface

–

26 MHz Write Capability

The LM3290 controls the LM3291 companion-IC

through direct control signals, and no additional

–

13 MHz Read Capability

controls are needed from the system. Shutdown,

standby, and idle modes turn the EM off and reduce

battery current consumption.

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.

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.