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