Step-down 30 V DC-DC converters integrate driver transistor

Featuring an internal driver transistor, the Torex XC9251 series 30V step-down DC-DC converter IC is now available from Digi-Key. The internal Nch driver transistor is driven by bootstrap to achieve a stable, high-efficiency power supply up to an output current of 2A. Low ESR capacitors such as ceramic capacitors can be used for the load capacitor (CL). A 0.8V reference-voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.2V to 12V using external resistors (RFB1, RFB2). 300kHz or 500kHz can be selected for the switching frequency.