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General Description

The RT9261 Series are VFM Step-up DC/DC ICs with ultra low supply current by CMOS process and suitable for use with battery-powered instruments.

The RT9261 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 a LX switch protection circuit. A low ripple and high efficiency step-up DC/DC converter can be constructed of this RT9261 IC with only three external components.

Features

? Minimal Number of External Components ( Onl an Inductor, a Diode, and a Capacitor)

? Ultra Low Input Current ( 5μA at Switch Off)

? ± 2 High Output Voltage Accuracy

? Low Ripple and Low Noise

? Low Start-up Voltage, 0.85V at 1mA

? 75 Efficiency with Low Cost Inductor

? +50 ppm/ °C Low Temperature-Drift

? SOT-89 and SOT-23-5 Small Packages

? RoHS Compliant and 100 Lead (Pb)-Free

Applications

? Power source for battery-powered equipment

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

? Power source for applications, which require higher voltage than that of batteries used in the appliances