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LT1931A

Linear Technology
Part Number LT1931A
Manufacturer Linear Technology
Description 1.2MHz/2.2MHz Inverting DC/DC Converters
Published Mar 22, 2005
Detailed Description LT1931/LT1931A 1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT FEATURES s s s s s s s s s s DESCRIPTIO Fixed Freq...
Datasheet PDF File LT1931A PDF File

LT1931A
LT1931A

Overview
LT1931/LT1931A 1.
2MHz/2.
2MHz Inverting DC/DC Converters in ThinSOT FEATURES s s s s s s s s s s DESCRIPTIO Fixed Frequency 1.
2MHz/2.
2MHz Operation Very Low Noise: 1mVP-P Output Ripple – 5V at 350mA from 5V Input –12V at 150mA from 5V Input Uses Small Surface Mount Components Wide Input Range: 2.
6V to 16V Low Shutdown Current: <1µA Low VCESAT Switch: 400mV at 1A Low Profile (1mm) ThinSOTTM Package Pin-for-Pin Compatible 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 350mA or –12V at 150mA from a 5V supply, while the LT1931A can generate –5V at 300mA 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 1mVP-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 ThinSOT package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
Disk Drive MR Head Bias Digital Camera CCD Bias LCD Bias GaAs 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 95 D1 ...


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