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The HM6133 is a constant frequency current mode step-up converter intended for small, low power applications. The HM6133 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 HM6133 features automatic shifting to pulse frequency modulation mode at light loads. The HM6133 includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of an output overload. The HM6133 is available in a small SOT23-6 package