The MAX610/MAX611/MAX612 AC-to-DC power converters reduce the component count, size, and weight of 1/4 watt power supplies, thus minimizing the overall cost and simplifying designs. With an 8VRMS input voltage, the MAX610 needs only a single filter capacitor to make a complete 5V, 50mA power supply. With the addition of a current-limiting resistor and a current-limiting capacitor, the MAX610 connects directly to the 110VAC or 220VAC power line to make a minimum component count 110/220VAC to 5VDC power supply. The devices in the MAX610 family differ in three respects: full- or half-wave rectification, 12V or 18V zener voltage, and the assignment of pin 4 to the function of setting the output voltage or setting the time delay. The MAX610 has a full-wave rectifier, a 12V zener, and the output voltage is either the internally preset +5V or user adjustable from +1.3V to +9V. The MAX611 has a half-wave rectifier, a 12V zener, a fixed +5V output, and pin 4 controls the time delay of the reset output. The MAX612 has a full-wave rectifier, an 18V zener, and the output voltage is either the internally preset +5V or user adjustable from +1.3V to +15V The low-cost MAX610 family is ideal for applications where the size, weight, and component count of 1/4 watt power supplies must be reduced. Reliable power-up reset and over/undervoltage detection make these devices well suited for microprocessor-based controllers.