The TPS53315 is a high-efficiency, single channel, synchronous buck converter designed for low output voltage point-of-load applications in computing and similar digital consumer applications. The device features proprietary D-CAP integrated circuit combined with an adaptive on-time architecture. This combination is designed for building modern low duty ratio, ultra-fast load step response DC-DC converters. The output voltage ranges from 0.6 V to 5.5 V. The conversion input voltage range is from 3 V up to 15 V. The D-CAP integrated circuit uses the ESR of the output capacitors to sense the device current. One advantage of this control scheme is that this control scheme does not require an external phase compensation network. This allows a simple design with a low external component count. Eight preset switching frequency values can be chosen using a resistor connected from the RF pin to ground or the VREG pin. Adaptive on-time control tracks the preset switching frequency over a wide input and output voltage range while allowing the switching frequency to increase at the step-up of the load.

The TPS53315 has a MODE pin to select between auto-skip mode and forced continuous conduction mode (FCCM) for light load conditions. The MODE pin also sets the selectable soft-start time ranging from 0.7 ms to 5.6 ms.