The MDD01L-09 is a series of DC-DC converters made by the electronics manufacturer Mean Well. They are used to provide a stable power source for a wide range of applications, including industrial automation, medical instrumentation, telecommunications, and HVAC control systems. The MDD01L-09 is a 1W single output (3.3V to 24V adjustable) ultra-miniature module. It features a efficiency up to 85%, high reliability, wide operating temperature range (-40°C to +85°C), and a built-in protection for short circuit and over load. The overall size of the MDD01L09 is only 25.2 x 15 x 8.5mm.