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DC/DC converter manages 3G,LTE bandwidths up to 20MHz

Posted: 09 Oct 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Texas Instruments? envelop tracking? power supply? linear amplifier? LTE?

Texas Instruments recently introduced an envelope tracking power supply solution to support 3G and 4G LTE multi-mode, multi-band RF power amplifiers used in smartphones and tablets. The LM3290 step-down converter with integrated DC boost and companion LM3291 linear amplifier enable the use of envelope tracking techniques in RF transmitters to reduce the power amplifier temperature by 20C and reduce overall power consumption by 25 per cent, compared to systems that use average power tracking.

LTE signals 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, which support battery voltages down to 2.5V, provide high efficiency at higher power output levels and high PAR, while meeting stringent receive band noise requirements in all LTE bands.

The LM3290 and LM3291 both manage all 3G and 4G LTE bandwidths up to 20MHz and battery voltages from 2.5V to 5V and also support requirements for major suppliers' power amplifiers. The devices' envelope tracking capability helps reduce heat and power consumption by as much as 25 per cent.

The LM3290 and LM3291 provide high efficiency, low noise, low output impedance and low output ripple voltage at high LTE bandwidths (LTE10 and 20). The devices support a minimum bandwidth of 75MHz, providing high accuracy with excellent adjacent channel leakage ratio and noise performance.

The LM3290 buck-boost converter comes in a 30-bump, lead-free DSBGA package, and is priced at US$0.80 in 1,000-unit quantities. The LM3291 linear amplifier comes in a 12-bump lead-free DSBGA package, and is priced at US$0.75 in 1,000-unit quantities.

Further information regarding TI's latest LM3291 linear amplifier can be found here.

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