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ROHM's BD9778F/HFP flexible step-down switching regulators incorporate an oscillator and a DMOSFET that features a high voltage resistance (36V max), large current (2A max) and low ON-resistance (0.53O typ).

The operating frequency is adjustable between 50 and 500kHz via external resistors in order to reduce switching noise in the AM (MW) signal band, while a standby current of 0µA contributes to increased energy savings. High reliability is ensured due to the wide operating temperature range (-40º to 125ºC), built-in overcurrent and thermal shutdown circuits, high ESD resistance (4kV) and integrated soft start function.

The units, which are offered in the SOP8 (BD9778F) and HRP7 (BD9778HFP) packages, deliver a reference voltage accuracy of ±2%, operate at high efficiency (90%) and possess a wide input voltage range (5V-35V), making them ideally suited for use in a wide variety of applications.