Switchingkonvertere til 2G/3G/4G PA'er
Texas Instruments lancerer RF DC/DC switchingkonvertere til 2G, 3G og 4G power amplifiers (in english).
Texas Instruments (TI) has added a duo of new RF DC/DC switching converters to its industry leading portfolio of RF power management integrated circuits (ICs). The new National LM3242 and LM3243 regulators are adaptive power supply ICs that minimise power consumption of the RF power amplifier (PA) across all operating conditions.Together with the National LM3241, the ICs extend battery life and reduce heat dissipated in battery-powered 2G, 3G and 4G long term evolution (LTE) portable devices such as smartphones and tablets.
Operation of the radio circuitry in portable devices accounts for a significant amount of total power consumption – easily 30-percent or more. RF PAs are among the least efficient components in today’s mobile systems, typically driven at maximum power regardless of the power actually needed. TI’s new LM3242 and LM3243 dynamically adjust the power delivered to the PA based on how much power is actually needed, saving a significant amount of energy.
The LM3242 and LM3243 are unique from traditional DC/DC switching converters as they are designed to meet stringent RF performance requirements and enable dynamic optimisation of the PA output power, saving up to 50-percent or more battery current consumption and reducing the PA heat by up to 30 degrees C.
Both ICs achieve 95-percent efficiency and feature multiple modes of operation to maximise efficiency for all battery and output conditions. The LM3242 is compatible with 3G and 4G applications and features a very small 9-mm square solution size. The LM3243 includes a unique active current assist and analogue bypass mode, which enables support for 2G, 3G and 4G applications while maintaining output regulation and minimal solution size.
