The TPS61230DRC uses a quasi-constant on-time valley current mode control scheme. During the on-time, the low-side N-channel MOSFET switch connects the inductor to ground, causing inductor current to ramp up. When the peak current threshold is reached, the switch turns off and the high-side P-channel synchronous rectifier turns on, transferring energy to the output. The valley current mode control regulates the inductor valley current, providing fast transient response and stable operation with low-ESR ceramic output capacitors. At light loads, the device enters power-save mode (PSM), skipping switching cycles to maintain regulation while dramatically reducing switching losses and quiescent current. The adjustable input voltage supervisor monitors VIN and disables switching when the input drops below the programmed threshold, preventing deep battery discharge. The programmable soft-start controls the inrush current by gradually increasing the current limit during startup. The power-good (PG) output indicates when the output voltage is within regulation. The load disconnect feature opens the output path during shutdown, preventing current flow from input to output.