The LM3279 is a buck-boost DC/DC converter designed to generate output voltages above or
below a given input voltage and is particularly suitable for Power Amplifiers operating from
single-cell Li-Ion batteries in portable applications.
The LM3279 has four modes of operation: Pulse Width Modulation (PWM), Pulse Frequency
Modulation (PFM), standby, and shutdown. During normal conditions, the LM3279 operates in full
synchronous PWM mode at 2.4-MHz typical switching frequency, providing seamless transitions between
buck and boost operating regimes. Energy-saving PFM mode increases efficiencies and current savings
during low-power RF transmission modes. For high-transmit power, the device operates in PWM buck or
boost mode, whereas the device can transition between PWM and PFM modes during low-power transmit.
The LM3279 can be controlled either via an included MIPI RFFE Digital Control Interface or by using
an analog control from an external MCU, offering design flexibility.
The power converter topology enables minimum total solution size by using one small
footprint and case size inductor and two surface mount capacitors.
The LM3279 is internally compensated for buck and boost modes of operation thus providing
an optimal transient response.
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