LM3290 Datasheet, PDF (1/3 Pages) Texas Instruments – LM3290 Product Brief

LM3290
www.ti.com
LM3290 Product Brief
SNVSA11 – AUGUST 2013
FEATURES
1
•2 V_{OUT_RANGE}
– V_{OUT_ET} = 0.6 V to 4.5 V
– V_{OUT_APT} = 0.4 V to 3.81 V (or V_IN – 200 mV)
• DC BOOST FOR ET OPERATION:
– Boost Input Voltage Range: 2.5 V to 5 V
– High-Efficiency (90% typical) with Internal
Synchronous Rectification
– Boost Bypass Function with Low
Resistance (150 mΩ typ.)
– 2.7 MHz PWM Switching Frequencies
• BUCK DC-DC FOR APT AND ET OPERATION:
– High Operating Frequency for Small
External Inductors and Capacitors
– V_{OUT_RANGE} = 0.6 V to min of 3.81 V and
V_IN – 200 mV
– High-Efficiency (95% typical) with Internal
Synchronous Rectification
– Low-Power PFM Mode
• LM3291 CONTROL:
– Automatic Control of LM3291 in ET Mode
• RFFE CONTROL INTERFACE:
– 1.8 V MIPI^® RFFE 1.1-Compatible Digital
Control Interface
– 26 MHz Write Capability
– 13 MHz Read Capability
MIPI eTrak
2.5V - 5V BATTERY
LM3290
LM3291
DESCRIPTION
The LM3290, with its companion IC LM3291, is an
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
of the input battery voltage (battery as low as 2.5 V)
and is controlled by the system by MIPI^® RFFE 1.1.
The LM3290 operates in two active modes:
1. For low TX output power, LM3290 may operate in
Average Power Tracking (APT) mode, providing a
static, but programmable, output voltage to
supply the PA. At light load and in APT mode, the
LM3290 enters into Pulse Frequency Mode
(PFM) operation automatically and operates with
reduced switching frequency. In PFM mode, the
quiescent current is reduced, which extends the
battery life.
2. In ET mode, the LM3290 with LM3291 efficiently
provides a dynamic, high-bandwidth supply
voltage for the PA to maximize total EM + PA
efficiency. The envelope modulator follows the
envelope reference input signal delivered by the
RFIC to the LM3291 via a differential analog
input. The output is a single-ended power supply
signal to the PA.
The LM3290 and LM3291 support 3G, as well as LTE
operation up to 20-MHz signal bandwidth.
The LM3290 controls the LM3291 companion-IC
through direct control signals, and no additional
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 [e-mail].
RFIC
or
BBIC
L
C
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.
MIPI is a registered trademark of Mobile Industry Processor Interface Alliance.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated