https://www.clafpower.com/products/235/swithing-regulator--0.5-3a.html
Switching Regulator (0.5-3A)
CLAF's switching regulator--DNK series provides wide input range of 4.75-36VDC, 6-36VDC, the wide output voltage range includes 3.3V, 5V, 9V, 12V, and 15V. Its pin is compatible with the LM78xx linear. The converter can also be used as a positive-to-negative converter, which is ideal for circuits that require a negative voltage source. The DNK series features low power consumption, high efficiency up to 96%, and short-circuit protection, and no the need for heatsinks, can save design space and energy. This series can be widely used in industrial, IOT, instrumentation, smart home and other industries.
