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OUTLINE

The RH5RH¡Á¡Á1A/¡Á¡Á2B/¡Á¡Á3B Series are PWM Step-up DC/DC converter ICs by CMOS process. The RH5RH¡Á¡Á1A IC consists of an oscillator, a PWM control circuit, a driver transistor (Lx switch), a reference voltage unit, an error amplifier, a phase compensation circuit, resistors for voltage detection, a soft-start circuit, and an Lx switch protection circuit. A low ripple, high efficiency step-up DC/DC converter can be constructed of this RH5RH¡Á¡Á1A IC with only three external components, that is, an inductor, a diode and a capacitor. These RH5RH¡Á¡Á1A/¡Á¡Á2B/¡Á¡Á3B ICs can achieve ultra-low supply current (no load) ¨CTYP. 15?A ¨Cby a new ly developed PWM control circuit, equivalent to the low supply current of a VFM (chopper) Step-up DC/DC converter.

FEATURES

? Small Number of External Components ..........Only an inductor, a diode and a capacitor(RH5RH¡Á¡Á1A)

? Low Supply Current........................................... TYP. 15?A (RH5RH301A)

? Low Ripple and Low Noise

? Low Start-up Voltage (when the output current is 1mA)..................MAX. 0.9V

? High Output Voltage Accuracy..........................¡À2.5

? High Efficiency...................................................TYP. 85

? Low Temperature-Drift Coefficient of Output Voltage......................TYP. ¡À50 ppm/?C

? Soft-Start.............................................................MIN. 500?s

? Small Packages...................................................SOT-89 (RH5RH¡Á¡Á1A, RH5RH¡Á¡Á2B), SOT-89-5 (RH5RH¡Á¡Á3B)