LM3207TLEV [Texas Instruments]

The LM3207 is a DC-DC converter optimized for powering RF power amplifiers (RFPAs) from a single Lithium-Ion cell. It steps down an input voltage range from 2.7V to 5.5V to a variable output voltage range from 0.8V to 3.6V. Output voltage is set using a VCON analog input for controlling power levels and efficiency of the RFPA. The LM3207 also provides a regulated reference voltage (Vref) through an integrated LDO with a maximum Iref of 10mA. It offers superior performance for powering WCDMA/CDMA RF power amplifiers and similar applications. Fixed-frequency PWM operation minimizes RF interference. Shutdown function turns the device off and reduces battery consumption to 0.01µA (typ). The LM3207 is available in a 9-pin leadfree DSBGA package. A high switching frequency (2MHz) allows use of tiny surface-mount components. Only four small external components are required, an inductor and three ceramic capacitors.