LT1931
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LT1931

1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 8
1ku List Price Starting From $2.56
Features
  • 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
  • Pin-for-Pin Compatible with the LT1611
  • Low Profile (1mm) ThinSOT Package
Additional Details
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The LT1931/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.

Applications

  • Disk Drive MR Head Bias
  • Digital Camera CCD Bias
  • LCD Bias
  • GaAs FET Bias
  • Local Low Noise/Low Impedance Negative Supply
Part Models 8
1ku List Price Starting From $2.56

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT1931AES5#TRMPBF
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LT1931ES5#TRMPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

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DC397A

LT1930AES5/LT1931AES5 Demo Board | 3 Circuits: Boost/SEPIC/Inverter: 5VIN to 12VOUT1 @ 250mA, 10V-16VIN to 12VOUT2 @ 250mA, 12VIN to -12VOUT3 @ 250mA

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DC397A

LT1930AES5/LT1931AES5 Demo Board | 3 Circuits: Boost/SEPIC/Inverter: 5VIN to 12VOUT1 @ 250mA, 10V-16VIN to 12VOUT2 @ 250mA, 12VIN to -12VOUT3 @ 250mA

LT1930AES5/LT1931AES5 Demo Board | 3 Circuits: Boost/SEPIC/Inverter: 5VIN to 12VOUT1 @ 250mA, 10V-16VIN to 12VOUT2 @ 250mA, 12VIN to -12VOUT3 @ 250mA

Product Detail

Demonstration circuit 397 is a multipurpose DC/DC switching regulator using the LT1930A and LT1931A voltage regulators in a SOT-23 package. The demo board offers three separate DC/DC converters for different applications needs. The boost circuit is designed to convert a 5V input to 12V output at 250mA maximum load. The SEPIC circuit generates a constant 12V/250mA (max load) output with a 10V~16V variable input. The inverter circuit is de-signed for applications requiring negative 12V/250mA (max load) from a positive 12V input. All three circuits are designed to demonstrate fast switching frequency (2.2MHz), an internal 36V/1A switch, wide input range, and small circuit size.

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DC383B

LTC1930ES5/LTC1931ES5 Demo Board | 3 Circuits: Boost/SEPIC/Inverter, 5VIN to 12VOUT1 @300mA, 10V-16VIN to 12VOUT2 @300mA, 12VIN to -12VOUT3 @350mA

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DC383B

LTC1930ES5/LTC1931ES5 Demo Board | 3 Circuits: Boost/SEPIC/Inverter, 5VIN to 12VOUT1 @300mA, 10V-16VIN to 12VOUT2 @300mA, 12VIN to -12VOUT3 @350mA

LTC1930ES5/LTC1931ES5 Demo Board | 3 Circuits: Boost/SEPIC/Inverter, 5VIN to 12VOUT1 @300mA, 10V-16VIN to 12VOUT2 @300mA, 12VIN to -12VOUT3 @350mA

Product Detail

Demonstration Circuit 383B is multipurpose demonstration board featuring the LT1930 and LT1931. The demo board offers three separate DC/DC converters. The Boost circuit is designed to convert a 5V input to 12V output at 300mA maximum load. The SEPIC circuit generates a 12V/300mA output from a 10V~16V variable input. The Inverter circuit is designed for applications requiring -12V/350mA from a positive 12V input.

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

Reference Designs

Reference Designs 4

Figure 1. CN0577 Simplified Block Diagram

Analog Front End and Digital Interface for Serial LVDS SAR ADCs

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CN0577

Analog Front End and Digital Interface for Serial LVDS SAR ADCs

CN0577

Circuits from the lab

tooltip Info:Circuits from the lab
Analog Front End and Digital Interface for Serial LVDS SAR ADCs

Features and Benefits

  • 18-Bit Resolution, 15 MSPS Data Acquisition System
  • Arbitrary Voltage Inputs Supported
  • All Clocking and Power Requirements are Onboard
  • FMC Connector for FPGA Interfacing
View Detailed Reference Design external link

Design & Integration Tools

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ZIP

6.81 M

DK-EMB-3C120N Dev Kit

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altera-embedded-systems-development-kit-cyclone-iii-edition

altera-embedded-systems-development-kit-cyclone-iii-edition

Circuits from the lab

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Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
View Detailed Reference Design external link
DK-DSP-3C120N Dev Kit

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altera-dsp-development-kit-cyclone-iii-edition

altera-dsp-development-kit-cyclone-iii-edition

Circuits from the lab

tooltip Info:Circuits from the lab

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
View Detailed Reference Design external link
DK-DEV-3C120N Dev Kit

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altera-cyclone-iii-fpga-development-kit

altera-cyclone-iii-fpga-development-kit

Circuits from the lab

tooltip Info:Circuits from the lab

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
View Detailed Reference Design external link

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