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RT9261B19CB Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9261B19CB Datasheet(HTML) 1 Page - Richtek Technology Corporation |
1 / 10 page Preliminary RT9261B DS9261B-03 September 2001 www.richtek-ic.com.tw 1 VFM Step-up DC/DC Converter 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. The CE pin enables the circuit to set the standby supply current at a maximum of 0.5 µA. Ordering Information RT9261B- Features Minimal Number of External Components (Only an Inductor, a Diode, and a Capacitor) Ultra Low Input Current (6.5 µµµµA 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 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 appliances, which require higher voltage than that of batteries used in the appliances Pin Configurations Part Number Pin Configurations RT9261B- CX (Plastic SOT-89) TOP VIEW 1. GND 2. VOUT (TAB) 3. LX RT9261B- CB (Plastic SOT-25) TOP VIEW 1. CE 2. VOUT 3. NC 4. GND 5. LX Operating temperature range C: Commercial standard Package type B : SOT-25 X : SOT-89 Output voltage 15 : 1.5V 16 : 1.6V : 49 : 4.9V 50 : 5.0V 54 3 2 1 12 3 |
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