Maxim has cut quiescent current to 20µA for a 24V 500mA buck converter, aimed at USB Type-C products. “USB Type-C products must generate an always-on 3.3V rail to detect USB insertions,” said the firm. “Products utilising the Power Delivery voltage range of 5 to 20V can generate an always-on 1.8, 3.3 or 5.0V digital supply rail ...
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from Electronics Weekly https://www.electronicsweekly.com/news/products/power-supplies/always-usb-c-power-chips-wastes-little-2017-08/
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