SLVSDG6B May 2016 – April 2021 TPS54302
The device is designed to operate in high-efficiency pulse-skipping mode under light-load conditions. Pulse skipping initiates when the switch current falls to 500 mA (typical). During pulse skipping, the low-side FET turns off when the switch current falls to 0 A. The switching node (the SW pin) waveform takes on the characteristics of discontinuous conduction mode (DCM) operation and the apparent switching frequency decreases. As the output current decreases, the perceived time between switching pulses increases.