Synchronous buck converter offers accurate regulation for a variety of loads

The Texas Instruments TPS57112C-Q1 device is a full-featured 6V, 2A, synchronous step-down current-mode converter with two integrated MOSFETs.

The device allows small designs by integrating the MOSFETs, implementing current-mode control to decrease external component count, lessening inductor size by allowing up to 2MHz switching frequency, and reducing the IC footprint with a small 3mm x 3mm thermally enhanced QFN package.

The device offers accurate regulation for a variety of loads with a ±1% voltage reference (Vref) over temperature.

The integrated 12mOhm MOSFETs and 515μA typical supply current maximise efficiency. Employing the enable pin to enter the shutdown mode lessens supply current to 5.5µA, typical.

The internal undervoltage lockout setting is 2.45V, but programming the threshold with a resistor network on the enable pin can increase the setting. The slow-start pin controls the output-voltage start-up ramp. An open-drain power-good signal shows when the output is within 93% to 107% of its nominal voltage.

Frequency foldback and thermal shutdown protect the device during an overcurrent condition.