 GENERAL DESCRIPTION

AX3704 can operate with input voltage from 2.5V to 5.5V and provide output range from 0.6V toinput level, thanks to its 100% duty cycle operation. The constant on time control scheme simplifies loop compensation and offers excellent load transient response.

AX3704 consumes extremely low 15µA quiescent current hence achieves superior light load efficiency. AX3704 is a 1.5MHz, 4A constant on time (COT) controlled syn chronous step down converter. The high gain error amplifier in the control loop provides excellent load and line regulation. Proprietary adaptive on time helps AX3704 to achieve nearly constant switching frequency across load range. AX3704 has cycle by cycle current limit and hiccup mode to protect over load or short circuit fault conditions.

AX3704 is available in low profile 10 leads DFN 3mm x 3mm packages.

 FEATURES

- +/-2% 0.6V Feedback Voltage

- Up to 95% Efficiency

- Proprietary Fast Transient Constant On Time Architecture Stable with low ESR Ceramic Output Capacitors

- Wide Input Range from 2.5V to 6V

- 1.5MHz Switching Frequency

- 15µA Low Quiescent Current

- 4A Output Current

- 1.21V Accurate Enable Threshold

- Cycle by cycle Current Limit Protection

- 100% Duty Cycle Operation

- Bui lt in 80mΩ/50mΩ Power Switches

- Internal 1msec Soft Start

- Over Load and Short Circuit Hiccup Mode

- Open Drain Power Good Indication

- Output Discharge

- Thermal Shutdown Protection

- Available in Small DFN3X3_10L

- RoHS and Halogen free compliance.

 APPLICATION

- WiFi RF Moudules

- Solid-State and Hard Disk Drives

- Smart Phone and Tablets

- DC/DC Micro Modules