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 ( Only 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-25 Small Packages
●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
