neral 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.
The RT9261A IC provides with a drive pin (EXT) for an
external transistor, so that a power transistor can be
externally applied. Therefore, the RT9261A IC is
recommended for applications where large currents are
required. CE pin enables circuit to set the standby supply
current at a maximum of 0.5μA.
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 appliancesneral 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.
The RT9261A IC provides with a drive pin (EXT) for an
external transistor, so that a power transistor can be
externally applied. Therefore, the RT9261A IC is
recommended for applications where large currents are
required. CE pin enables circuit to set the standby supply
current at a maximum of 0.5μA.
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