The TPS548B23 device is a high-efficiency, single-channel, small-sized, synchronous buck converter. The device is designed for low output voltage point-of-load applications with 20A or lower output current in server, storage, and similar computing applications. The TPS548B23 features proprietary D-CAP4 mode control combined with adaptive on-time architecture. This combination builds modern low-duty-ratio and ultra-fast load-step-response DC/DC converters in an ideal fashion. The output voltage set by the feedback voltage divider ranges from the internal voltage reference to 5.5V. The conversion input voltage ranges from 4V to 16V, and the VCC input voltage ranges from 3.13V to 5.3V. The D-CAP4 modulator uses emulated current information to control the modulation. The D-CAP4 modulator reduces loop gain variation with different output voltages providing better transient response in higher output voltage applications. An advantage of this control scheme is that this control scheme does not require a phase-compensation network outside which makes the device easy-to-use and also allows low external component count. Another advantage of this control scheme is that this control scheme supports stable operation with all low ESR output capacitors (such as ceramic capacitors and low ESR polymer capacitors). Lastly, adaptive on-time control tracks the preset switching frequency over a wide range of input and output voltages while increasing switching frequency as needed during load-step transients.