The MAX631ACPA is +5V fixed output, step-up DC-DC converters for use in low-power, high-efficiency switching regulator applications. The only external components required are an output filter capacitor and a low-cost inductor. Included on-chip are low battery detection circuitry and a charge pump output for generating a negative voltage in dual-supply applications. Though most simply used as fixed output regulators, the MAX631ACPA can also be set for other output voltages by adding an external voltage divider. The broad line of step-up, step-down, and inverting DC-DC converters, with features such as logic-level shutdown, adjustable oscillator frequency, and external MOSFET drive.