AX5523

AX5523 High Efficiency 1.2MHz 2A Step Up Converter  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 16V 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 1/9 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.1 May.06, 2013 AX5523  BLOCK DIAGRAM  PIN ASSIGNMENT The package of AX5523 is SOT-23-6L; the pin assignment is given by: Name Description Power Switch Output. SW is the drain of the internal MOSFET SW switch. Connect the power inductor and output rectifier to SW. SW can NC VIN EN swing between GND and 28V. 5 6 4 GND Analog Ground pin. Feedback Input. The FB voltage is ( Top View) FB 0.6V. Conne...