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LT3461A Datasheet(PDF) 1 Page - Linear Technology |
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LT3461A Datasheet(HTML) 1 Page - Linear Technology |
1 / 8 page LT3461/LT3461A 1 3461af TYPICAL APPLICATIO FEATURES DESCRIPTIO APPLICATIO S ■ Digital Cameras ■ CCD Bias Supply ■ XDSL Power Supply ■ TFT-LCD Bias Supply ■ Local 5V or 12V Supply ■ Medical Diagnostic Equipment ■ Battery Backup 5V to 12V, 70mA Step-Up DC/DC Converter Efficiency VIN 5V L1 10µH 261k 30.1k C2 1µF 15pF C1 1µF VOUT 12V 70mA 1 2 VIN VOUT SW 3 4 5 6 FB SHDN GND LT3461A 3461 TA01a OFF ON ■ Integrated Schottky Rectifier ■ Fixed Frequency 1.3MHz/3MHz Operation ■ High Output Voltage: Up to 38V ■ Low VCESAT Switch: 260mV at 250mA ■ 12V at 70mA from 5V Input ■ 5V at 115mA from 3.3V Input ■ Wide Input Range: 2.5V to 16V ■ Uses Small Surface Mount Components ■ Low Shutdown Current: <1µA ■ Soft-Start ■ Low Profile (1mm) SOT-23 (ThinSOT TM) Package 1.3MHz/3MHz Step-Up DC/DC Converters with Integrated Schottky in ThinSOT The LT ®3461/LT3461A are general purpose fixed fre- quency current mode step-up DC/DC converters. Both devices feature an integrated Schottky and a low VCESAT switch allowing a small converter footprint and lower parts cost. The LT3461 switches at 1.3MHz while the LT3461A switches at 3MHz. These high switching frequencies en- able the use of tiny, low cost and low height capacitors and inductors. The constant switching frequency results in predictable output noise that is easy to filter, and the inductor based topology ensures an input free from switch- ing noise typically present with charge pump solutions. The high voltage switch in the LT3461/LT3461A is rated at 40V making the device ideal for boost converters up to 38V. The LT3461/LT3461A are available in a low profile (1mm) SOT-23 package. , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. LOAD CURRENT (mA) 0 85 80 75 70 65 60 3461 TAO1b 20 40 60 80 VIN = 5V VIN = 3.3V |
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