Boost Converter Has High Efficiency at Light Loads

Abstract: This design note shows how a boost converter is designed from a quad Schmitt-trigger NAND gate and the MAX921, a comparator with integrated voltage reference. Consuming only microwatts of power, this 5V-to-15V boost converter provides low load currents with high efficiency. The efficiency is > 90% for load currents between 1mA and 8mA.