General Description

The RT9261B Series are VFM Step-up DC/DC converter ICs with ultra low supply current by CMOS process and suitable for use with battery-powered instruments.

The RT9261B 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 with the RT9261B IC and only three external components.

Features

• Minimal Number of External Components (Only an Inductor, a Diode, and a Capacitor)

• Ultra Low Input Current (6.5μA at Switch Off)

• Capable of Supplying 50mA Output Current with Internal Switch

• ± 2% Output Voltage Accuracy

• Low Ripple and Low Noise

• Low Start-up Voltage, 0.8V at 1mA

• 80% 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 appliances, which require higher voltage than that of batteries used in the appliances