Texas Instruments (TI) has introduced the industry’s first RF power converters to integrate the MIPI Alliance’s radio frequency front-end (RFFE) digital control interface, a specification that simplifies multi-band and multi-radio communications. The highly efficient LM3263 buck converter and LM3279 buck-boost converter are able tosignificantly reduce the heat and power consumption in RF power amplifiers, improving battery life and extending talk time in 2G, 3G and 4G LTE smartphones, tablets and data cards.
The LM3263 2.5-A buck converter’s average power tracking feature helps it meet stringent RF requirements of multi-mode, multi-band power amplifiers with fast output voltage transients. The device also includes active current assist and bypass to minimize inductor size without loss of output regulation — resulting in a 10-mm2 solution, which is half the size of competing solutions. The LM3279 1-A buck-boost regulator supports fast output voltage transients for 3G and 4G LTE. The device enables the amplifier to support high output power and high data rates, even at low battery voltages.
TI has also introduced the LM8335 general output expander with MIPI RFFE host interface to complement the LM3263 and LM3279. The expander reduces the general-purpose input/output pin allocation and gives designers greater design flexibility to support up to eight additional analogue outputs that use analogue-controlled, non-MIPI RFFE compliant components.