The TPS51117 is a cost effective, synchronous buck controller for POL voltage regulation in notebook PC applications. The controller is dedicated for Adaptive On-Time D-CAPTM Mode operation that provides ease of use, low external component count, and excellent fast transient response at the same time. Auto-skip mode for high efficiency down to the milli-ampere load range, or PWM-only mode for low noise operation is selectable. The current sensing scheme for positive overcurrent and negative overcurrent protection is loss-less low-side