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RT9261-45CB Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9261-45CB Datasheet(HTML) 1 Page - Richtek Technology Corporation |
1 / 14 page Preliminary RT9261/A DS9261/A-03 January 2002 www.richtek-ic.com.tw 1 VFM Step-up DC/DC Converter 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. 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 0.5 µA. Ordering Information RT9261A- Features Minimal Number of External Components ( Only an inductor, a diode, and a capacitor) Ultra Low Input Current ( 5 µµµµA 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 Pin Configurations Part Number Pin Configurations RT9261- CX (Plastic SOT-89) TOP VIEW 1. GND 2. VOUT (TAB) 3. LX RT9261A- CX (Plastic SOT-89) TOP VIEW 1. GND 2. VOUT (TAB) 3. EXT RT9261- CB (Plastic SOT-25) TOP VIEW 1. CE 2. VOUT 3. NC 4. GND 5. LX RT9261A- CB (Plastic SOT-25) TOP VIEW 1. CE 2. VOUT 3. NC 4. GND 5. EXT 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 A : Use external switch Use internal switch 12 3 12 3 54 3 2 1 54 3 2 1 |
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