AX3703A can operate with input voltage from 2.5V to 5.5V and provide output range from 0.6V to input level, thanks to its 100% duty cycle operation. AX3703A is a 1.5MHz, 2.5A/3A constant on-time (COT) controlled synchronous step-down converter.

AX3703A consumes extremely low 15μA quiescent current hence achieves superior light load efficiency. The constant on-time control scheme simplifies loop compensation and offers excellent load transient response.

AX3703A has cycle-by-cycle current limit and hiccup mode to protect over-load or short circuit fault conditions. The high gain error amplifier in the control loop provides excellent load and line regulation. Proprietary adaptive on-time helps AX3703A to achieve nearly constant switching frequency across load range.

AX3703A is available in low profile SOT23-5L, SOT23-6L and 8 leads DFN 2mm x 2mm packages.