The MAX1760 is a high-efficiency, low-noise, step-up DC-DC converter intended for use in battery-powered wireless applications. It maintains exceptionally low quiescent supply current (100A) despite its high 1MHz operating frequency. Small external components and a tiny 10-pin MAX package make this device an excellent choice for small hand-held applications requiring the longest possible battery life. The MAX1760 uses a synchronous-rectified pulsewidth-modulation (PWM) boost topology to generate 2.5V to 5.5V outputs from a wide range of input sources, such as 1 to 3 alkaline or NiCd/NiMH cells or a single lithium-ion (Li+) cell. Maxim's proprietary IdleModeTM circuitry significantly improves efficiency at light load currents while smoothly transitioning to fixedfrequency PWM operation at higher load currents to maintain excellent full-load efficiency. Low-noise, forced PWM mode is available for applications requiring constant-frequency operation at all load currents. The MAX1760 may also be synchronized to an external clock to protect sensitive frequency bands in communications equipment. Analog soft-start and adjustable current limit permit optimization of efficiency, external component size, and output voltage ripple.