LT1931 Datasheet | Linear Technology

LT1931/LT1931A 1.2MHz/2.2MHz Inverting DC/DC Converters in Thin SOT Features s s s s s s s s s s DESCRIPTIO Fixed Frequency 1.2MHz/2.2MHz Operation Very Low Noise: 1m VP-P Output Ripple - 5V at 350m A from 5V Input - 12V at 150m A from 5V Input Uses Small Surface Mount ponents Wide Input Range: 2.6V to 16V Low Shutdown Current: <1µA Low VCESAT Switch: 400m V at 1A Low Profile (1mm) Thin SOTTM Package Pin-for-Pin patible with the LT1611 U APPLICATIO S s s s s s The LT®1931/LT1931A are the industry’s highest power inverting SOT-23 current mode DC/DC converters. Both parts include a 1A integrated switch allowing high current outputs to be generated in a small footprint. The LT1931 switches at 1.2MHz while the LT1931A switches at 2.2MHz. These high speeds enable the use of tiny, low cost capacitors and inductors 2mm or less in height. The LT1931 is capable of generating - 5V at 350m A or - 12V at 150m A from a 5V supply, while the LT1931A can generate - 5V at 300m A using significantly smaller inductors. Both parts are easy pin-for-pin upgrades for higher power LT1611 applications. The LT1931/LT1931A operate in a dual inductor inverting topology that filters both the input side and output side current. Very low output voltage ripple approaching 1m VP-P can be achieved when ceramic output capacitors are used. Fixed frequency switching ensures a clean output free from low frequency noise typically present with charge pump solutions. The low impedance output remains within 1% of nominal during large load steps. The 36V switch allows VIN to VOUT differential of up to 34V. The LT1931/LT1931A are available in the 5-lead Thin SOT package. , LTC and LT are registered trademarks of Linear Technology Corporation. Thin SOT is a trademark of Linear Technology Corporation. Disk Drive MR Head Bias Digital Camera CCD Bias LCD Bias Ga As FET Bias Local Low Noise/Low Impedance Negative Supply TYPICAL APPLICATIO VIN 5V VIN SHDN C1 4.7µF LT1931 NFB GND L1A 10µH C2 1µF L1B 10µH 100...