Analog Devices has introduced a 150V buck converter that draws 9µA quiescent – that is only 1.35mW wasted at full input voltage. Called LTC3894, its input range is 4.5 to 150V, and the the firm makes an interesting point: that this wide range can eliminate the need for external surge suppression devices on lower voltage rails. ...
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from Electronics Weekly https://www.electronicsweekly.com/news/products/power-supplies/150vin-buck-converter-idles-9%c2%b5a-2018-07/
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