LM3218
Description
The LM3218 is a DC-DC converter with inductor which is optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell. It steps down an input voltage in the range from 2.7V to 5.5V to an adjustable output voltage of 0.8V to 3.6V. Output voltage is set by using a VCON analog input to control power levels and efficiency of the RF PA. The LM3218 offers superior electrical performance for mobile phones and similar RF PA applications with a reduced footprint (3mm x 2.5mm x 1.2mm). Fixed-frequency PWM operation minimizes RF interference. A shutdown function turns the device off and reduces battery consumption to 0.01 µA (typ.). The LM3218 is available in an integrated inductor 8- pin LTCC package. A high switching frequency (2 MHz typ.) allows use of tiny surface-mount ponents. Only two small external surface-mount ponents, two ceramic capacitors, are required. The overall board space is reduced up to 25% from the typical discrete inductor solution.
Features
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