LT1931A Datasheet

Part No.	In Stock	Price	Packaging	SPQ	Marking	MSL	Pins	Temp Range	Package Description
LT1931AES5#TRMPBF	1000pcs	$2.88	Reel	500	LTSP	1	5	-40°C ~ 125°C	5-Lead TSOT-23
LT1931AES5#TRPBF	0	$2.88	Reel	2500	LTSP	1	5	-40°C ~ 125°C	5-Lead TSOT-23
LT1931AIS5#TRMPBF	500pcs	$3.024	Reel	500	LTBZG	1	5	-40°C ~ 125°C	5-Lead TSOT-23
LT1931AIS5#TRPBF	2500pcs	$3.024	Reel	2500	LTBZG	1	5	-40°C ~ 125°C	5-Lead TSOT-23

• Fixed Frequency 2.2MHz Operation
• Very Low Noise: 1mV_P-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 V_CESAT Switch: 400mV at 1A
• Pin-for-Pin Compatible with the LT1611
• Low Profile (1mm) ThinSOT^™ Package

• Disk Drive MR Head Bias
• Digital Camera CCD Bias
• LCD Bias
• GaAs FET Bias
• Local Low Noise/Low Impedance Negative Supply

The LT1931A is 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  LT1931A switches at 2.2MHz. These high speeds enable the use of tiny, low cost capacitors and inductors 2mm or less in height. The LT1931A can generate –5V at 300mA using significantly smaller inductors. This parts are easy pin-for-pin upgrades for higher power LT1611 applications.

The LT1931A operate in a dual inductor inverting topology that filters both the input side and output side current. Very low output voltage ripple approaching 1mV_P-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 V_IN to V_OUT differential of up to 34V.

The LT1931A is available in the 5-lead ThinSOT package.