Features: ` Minimal Number of External Components (Only an Inductor, a Diode, and a Capacitor)
` Ultra Low Input Current (6.5A 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-25 Small PackagesApplication· Power source for battery-powered equipment
· Power source for cameras, camcorders, VCRs,PDAs, pagers, electronic data banks, and handheld communication equipment
· Power source for appliances, which require higher voltage than that of batteries used in the appliances
Pinout
SpecificationsOutput Voltage .............................................8V
LX Pin Voltage ..............................................8V
CE Pin Voltage(1) ...............-0.3 to VOUT +0.3V
LX Pin Output Current............................ 400mA
Power Dissipation, PD @ TA = 25°C
SO...................................................T-89 0.5W
SOT-25 0.25W
Package Thermal Resistance
SOT-89, JC .....................................100°C/W
SOT-89, JA .....................................300°C/W
SOT-25, JA .....................................250°C/W
Operating Temperature Range...... -20 to +85°C
Storage Temperature Range .....-65°C to 150°C
Lead Temperature (Soldering, 10 sec.) .....260°C
Notes: (1) Applicable to RT9261B-xxCB
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.
The EN pin enables the circuit to set the standby supply current at a maximum of 0.5uA.
RT9261B Data Sheet
