Four-phase step-down buck controller with NVM and PMBus interface

This post is sponsored by Texas Instruments. The Texas Instruments (TI) TPS53647 is a high-current, multi-phase, step-down controller offering built-in non-volatile memory (NVM) and PMBus interface. It is fully compatible with the NexFET power stage (CSD95372BQ5MC). The TPS53647 provides 8-bit BOOT voltage selection covering output voltage from 0.5V to 2.5V, with steps as small as 5mV, which is ideal for high-current application with accurate output voltage setting, says the company. Advanced control features such as D-CAP+ architecture with undershoot reduction (USR) and over-shoot reduction (OSR) provide fast transient response, lowest output capacitance, and high efficiency. The TPS53647 also provides novel phase interleaving strategy and dynamic phase shedding for efficiency improvement at light loads. In addition, the TPS53647 supports the PMBus communication interface with systems for telemetry of voltage, current, power, temperature, and fault conditions. Some of the configurations can be programmed by pinstrap or PMBus and stored in non-volatile memory to minimize the external component count. The TPS53647 is offered in a space saving, thermally-enhanced 40-pin QFN package and is rated to operate from -40C to 125C.