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LM3291

更新时间： 2024-11-12 12:36:35
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LM3291 Product Brief

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LM3291 数据手册

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LM3291  
www.ti.com  
SNVSA12 –SEPTEMBER 2013  
LM3291 Product Brief  
1
FEATURES  
DESCRIPTION  
The LM3291 is a high-speed linear amplifier that, with  
its companion IC LM3290, constitutes an RF  
Envelope Modulator (EM) for supplying 3G/4G Power  
Amplifiers (PA) in envelope tracking systems. The  
amplifier provides extremely low output impedance  
and low output noise over a wide bandwidth.  
23  
•
Highly Programmable High-Current Linear  
Amplifier  
•
> 75 MHz Typical Small Signal Bandwidth  
Extremely Low Output Impedance  
High Linearity  
•
•
•
In conjunction with an Envelope Tracking (ET)  
capable RFIC and PA, the LM3291 and LM3290  
greatly improve PA efficiency for 3G and LTE  
operation.  
Differential Analog Input Compatible with  
eTrak 1.0 Standard  
•
•
Low Output Noise  
When paired with the LM3290 provides a  
complete Envelope Modulator solution for  
3G/4G Envelope Tracking Power Amplifiers.  
In ET mode, the LM3291 and LM3290 provide  
envelope tracking supply voltage for the PA  
maximizing total EM + PA efficiency. The envelope  
modulator follows the differential envelope reference  
input signal delivered by the RFIC to the LM3291.  
The output is a single-ended dynamic power supply  
voltage to the PA.  
•
Automatically controlled through LM3290 in an  
envelope modulation solution using MIPI®  
RFFE 1.1-compatible interface.  
APPLICATIONS  
The LM3291 supports 3G and LTE operation up to 20  
MHz signal bandwidth.  
•
•
•
3G/LTE Handsets  
3G//LTE Tablets  
The LM3291’s programmable parameters are  
controlled by LM3290 via a direct serial interface  
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.  
3G/LTE Data Cards and Wireless Modems  
MIPI eTrak  
2.5V - 5V  
BATTERY  
LM3291  
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.  
LM3290  
RFIC  
or  
L
C
BBIC  
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  
representative at ET@list.ti.com.  
a TI  
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
3
MIPI is a registered trademark of Mobile Industry Processor Interface Alliance.  
All other trademarks are the property of their respective owners.  
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  
123

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