The MIC2127A is a constant-frequency synchronous buck controller featuring a unique adaptive on-time control architecture. The MIC2127A operates over an input voltage range from 4.5V to 75V. The output voltage is adjustable down to 0.6V with an accuracy of ±1%. The device operates with programmable switching frequency from 270kHz to 800kHz. The MIC2127A also features a MODE pin that allows the user to select either continuous conduction mode or hyper light load (HLL) mode under light loads and a full suite of protection features to ensure protection of the IC during fault conditions. These include undervoltage lockout to ensure proper operation under power-sag conditions, “hiccup” mode short-circuit protection, internal soft start of 5mS to reduce inrush current during start-up and thermal shut-down. The MIC2127A is available in a 16-pin 3mm x 3mm VQFN package, with an operating junction temperature range from –40°C to 125°C.