Inductor built-in step-down DC-DC converter expands lineup

Torex Semiconductor has launched the XCL230/XCL231 as a new series of low supply current, built-in step-down DC-DC converter.

The series is a 36V, 600mA step-down DC-DC converter with an integrated control IC and coil. Combining the coil makes for easier circuit board layout and reduces malfunction and noise from the component and wiring layout. The input voltage range is 3V to 36V, the switching frequency is 1.2MHz, and a synchronous rectification circuit is employed to deliver a stable power supply at high efficiency. The DFN3030-10B (3mm x 3mm, h=1.6mm) package is employed for a small package size.

The XCL230 Series fixes the operation frequency utilising PWM control to suppress output ripple voltage. The XCL231 Series automatically switches between PWM and PFM control to decrease loss by lowering the operation frequency throughout low loads to deliver high efficiency over the complete range from low to high loads. A 0.75V standard voltage supply is built in, and the output voltage can be set to 1V to 5V employing an external resistance.

The 'cool post type' package applied in series enables the upper coil to be connected to the PCB with low resistance in electricity and heat by penetrating the Cu post inside. Low resistance and high heat dissipation can be achieved.