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TI's envelope tracking solution supports LTE bands

09 Oct 2013

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TI has launched an envelope tracking DC/DC converter for 3G and 4G LTE multi-mode, multi-band RF power amplifiers used in smartphones and tablets. The RF envelope tracking power supply supports all LTE bands, including full 20MHz LTE spectrum. The LM3290 step-down converter with integrated DC boost and companion LM3291 linear amplifier allow the use of envelope tracking methods in RF transmitters to reduce the power amplifier temperature by 20 degrees C and overall power consumption by 25 per cent.

LTE signals, available in more than 20 distinct bands across the world from various carriers, provide high-speed data transmission that need a high peak-to-average ratio (PAR), and generate higher transmit power, which reduces the efficiency of RF power amplifiers and creates extra heat. The LM3290 and LM3291 support battery voltages down to 2.5 V and provide improved efficiency at higher power output levels and high PAR while meeting stringent receive band noise requirements in all LTE bands.

The LM3290 buck-boost converter comes in a 30-bump, lead-free DSBGA package, and is priced at $0.80 in 1,000-unit quantities. The LM3291 linear amplifier comes in a 12-bump lead-free DSBGA package, and is priced at $0.75 in 1,000-unit quantities. Samples, evaluation modules, and complete data sheets are available to select customers.




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