RH5RI301B-T1

VFM STEP-UP DC-DC CONVERTER

OUTLINE

The RH5RI××1B/××2B/××3B Series are VFM Chopper Step-up DC/DC converter ICs with ultra low supply

current by CMOS process. The RH5RI××1B IC consists of an oscillator, a VFM control circuit, a driver transistor Lx switch, a reference voltage unit, an error amplifier, resistors for voltage detection, and an Lx switch protection circuit.  A low ripple, high efficiency step-up DC/DC converter can be constructed of this RH5RI××1B IC with only three external components, that is, an inductor, a diode and a capacitor.

FEATURES

• Small Number of External Components.......... Only an inductor, a diode and a capacitor RH5RI××1B

• Ultra Low Input Current................................... TYP. 4µA RH5RI301B/303B at no load,with 1.5V input

• High Output Voltage Accuracy.........................±2.5%

• Low Ripple and Low Noise

• Low Start-up Voltage When the output current is 1mA......................MAX.  0.9V

• High Efficiency...................................................TYP.80%

• Low Temperature-Drift Coefficient of Output Voltage..........................TYP. ±50 ppm/˚C

• Small Packages................................................... SOT-89 RH5RI××1B,  RH5RI××2B

                                                       SOT-89-5 RH5RI××3B

APPLICATIONS

• Power source for battery-powered equipment.

• Power source for cameras, camcorders, VCRs,  PDAs, electronic data banks,and hand-held communication

equipment.

• Power source for appliances which require higher cell voltage than that of batteries used in the appliances.