 GENERAL DESCRIPTION

The AX5523 is a constant frequency, 6-pin SOT23 current mode step-up converter intended for small, low power applications. The AX5523 switches at 1.2MHz and allows the use of tiny, low cost capacitors and inductors 2mm or less in height. Internal soft-start results in small inrush current and extends battery life.

The AX5523 features automatic shifting to pulse frequency modulation mode at light loads. The AX5523 includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload. The AX5523 is available in a small 6-pin SOT-23 package.

 FEATURES

- Integrated 80mΩ Power MOSFET

- 2.6V to 12V Input Voltage

- 1.2MHz Fixed Switching Frequency

- Internal 4A Switch Current Limit

- Adjustable Output Voltage

- Internal Compensation

- Up to 28V Output Voltage

- Automatic Pulse Frequency Modulation Mode at Light Loads

- up to 97% Efficiency

- Available in a 6-Pin SOT23-6 package

- RoHS and Halogen free compl iance.