 GENERAL DESCRIPTION
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.

 FEATURES
- AX3703A Z8A : Built in 90mΩ/60mΩ Power Switches
- AX3703AZ8A: 3A Continuous Output Current
- AX3703A CA : 2.5A Continuous Output Current , 3A Peak Output Current
- AX3703A CA : Built in 94mΩ/76mΩ Power Switches
- Wide Input Range from 2.5V to 6V
- Proprietary Fast Transient Constan t On Time Architecture Stable with low ESR Ceramic Output Capacitors
- 1.5MHz Switching Frequency
- 15µA Low Quiescent Current
- +/-2% 0.6V Feedback Voltage
- 1.21V Accurate Enable Threshold
- Up to 95% Efficiency
- 100% Duty Cycle Operation
- Thermal Shutdown Protec tion
- Internal 1msec Soft-Start
- Cycle-by-cycle Current Limit Protection
- Over-Load and Short Circuit Hiccup Mode
- Open Drain Power Good Indication
- Output Discharge
- Available in Small SOT23_5L, SOT23_6L and DFN2x2_8L
- Pb-Free RoHS Compliant
- RoHS and Halogen free compliance.

 APPLICATION
- WiFi RF Moudules
- Smart Phone and Tablets
- Solid-State and Hard Disk Drives
- DC/DC Micro Modules