AiT Semiconductor, a leading fabless IC design company ISO9001/ISO14001 registered, devoted to the design and marketing of analog & mixed-signal integrated circuits, has introduced the A7801B, a buck(step-down) DC-DC converter that provides synchronous operations for digital cameras, USB OTG, LED driver and smart card readers.

The A7801B is a low noise, constant frequency (1MHz) switched capacitor voltage doubler. It provides regulated output voltage from a 2.1V to 5.0V input with up to 230mA of output current. Low external parts count (one flying capacitor and two small bypass capacitors at V_IN and V_OUT) make the A7801B ideally suited for small, battery-powered applications.

A7801B is a new charge-pump architecture that maintains constant switching frequency to zero load and reduces both output and input ripple. It has thermal shutdown capability and can survive a continuous short circuit from V_OUT to GND. Built-in soft-start circuitry prevents excessive inrush current during start-up. The A7801B is available in a SOT-26 surface-mount package that measures 2.82 x 1.5 x 1.05 mm.