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RH5RI303B-T1 Datasheet(PDF) 2 Page - RICOH electronics devices division |
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RH5RI303B-T1 Datasheet(HTML) 2 Page - RICOH electronics devices division |
2 / 24 page VFM STEP-UP DC/DC CONVERTER 1 RH5RI ××1B/××2B/××3B SERIES 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 com- ponents, that is, an inductor, a diode and a capacitor. The RH5RI ××2B IC uses the same chip as that employed in the RH5RI××1B IC and is provided with a drive pin (EXT) for an external transistor instead of an Lx pin, so that a power transistor with a low saturation voltage can be externally provided, whereby a large current can be caused to flow through the inductor and accordingly a large current can be obtained. Therefore, the RH5RI ××2B IC is recommendable to the user who need a current as large as several tens mA toseveral hundreds mA. The RH5RI ××3B IC also includes an internal chip enable circuit so that it is possible to set the standby sup- ply current at MAX. 0.5µA. These RH5RI ××1B/××2B/××3B ICs are suitable for use with battery-powered instruments with low noise and ultra low supply current. • 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) FEATURES 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. |
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