LT8333
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LT8333

Low IQ Boost/SEPIC/Inverting Converter with 3A, 40V Switch

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 2
1ku List Price Starting From $1.54
Features
  • Wide Input Voltage Range: 2.8V to 40V
  • Ultralow Quiescent Current and Low Ripple
  • Burst Mode® Operation: IQ = 9μA
  • 3A, 40V Power Switch
  • Positive or Negative Output Voltage Programming with a Single Feedback Pin
  • Programmable Frequency (300kHz to 2MHz)
  • Synchronizable to an External Clock
  • Spread Spectrum Frequency Modulation for Low EMI
  • Bias Pin for Higher Efficiency
  • Programmable Undervoltage Lockout (UVLO)
  • Overcurrent and Overtemperature Protection
  • Thermally Enhanced 10-Lead 3mm × 3mm DFN Package
Additional Details
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The LT8333 is a current mode DC/DC converter with a 40V, 3A switch operating from a 2.8V to 40V input. With a unique single feedback pin architecture, it is capable of boost, SEPIC or inverting configurations. Burst Mode operation consumes as low as 9μA quiescent current to maintain high efficiency at very low output currents, while keeping typical output ripple below 15mV.

An external compensation pin allows optimization of loop bandwidth over a wide range of input and output voltages and programmable switching frequencies between 300kHz and 2MHz. A SYNC/MODE pin allows synchronization to an external clock. It can also be used to select between BURST or PULSE SKIP modes of operation with spread spectrum frequency modulation for low EMI. For increased efficiency, a BIAS pin can accept a second input to supply the INTVCC regulator. Additional features include frequency foldback and programmable soft-start to control inductor current during start-up.

The LT8333 is available in a thermally enhanced 10-lead 3mm × 3mm DFN package.

APPLICATIONS

  • Industrial and Automotive
  • Telecom
  • Medical Diagnostic Equipment
  • Portable Electronics
Part Models 2
1ku List Price Starting From $1.54

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT8333RDD#PBF
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  • HTML
LT8333RDD#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

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EVAL-LT8333-BZ

LT8333 | Low IQ Boost/SEPIC Inverting Converter with 3A, 40V Switch

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EVAL-LT8333-BZ

LT8333 | Low IQ Boost/SEPIC Inverting Converter with 3A, 40V Switch

LT8333 | Low IQ Boost/SEPIC Inverting Converter with 3A, 40V Switch

Product Detail

Evaluation circuit EVAL-LT8333-BZ features the LT8333 in a Boost configuration. It operates with a switching frequency of 2MHz and is designed to convert a 4.5V to 20V source to 24V output. The converter can output up to 2A depending on the input voltage (see Figure 3 in the demo manual, Maximum Output Current vs VIN curve).

This evaluation circuit features Spread-Spectrum Frequency Modulation (SSFM) and EMI filters to provide optimum EMI performance. This PCB layout is optimized for good EMI performance and small solution size. The evaluation board contains a selectable jumper, JP1, to aid in the selection of the desired SYNC pin mode of operation. At light load, either pulse-skipping (PULSE SKIP) or low-ripple Burst Mode® operation (BURST) can be selected to improve the efficiency.

The LT8333 boost/SEPIC/inverting converter IC operates over an input range of 2.8V to 40V, suitable for automotive, telecom, and industrial applications. The converter provides adjustable and synchronizable operation from 300kHz to 2MHz with SSFM option. The LT8333 packs other popular features such as soft-start, bias pin, input undervoltage lockout. The IC can exhibit a low quiescent current down to 9μA in BURST mode and 1μA in shutdown, which makes it ideal for battery-operated systems. The LT8333 is assembled in a thermally enhanced 10-lead 3mm × 3mm DFN package.

The data sheet gives a complete description of the device, operation, and application information. The data sheet must be read in conjunction with the demo manual for EVAL-LT8333-BZ.

There is another evaluation board EVAL-LT8333-AZ featuring the LT8333 in a SEPIC configuration.

reference details image

EVAL-LT8333-AZ

LT8333 | Low IQ Boost/SEPIC/Inverting Converter with 3A, 40V Switch

zoom

EVAL-LT8333-AZ

LT8333 | Low IQ Boost/SEPIC/Inverting Converter with 3A, 40V Switch

LT8333 | Low IQ Boost/SEPIC/Inverting Converter with 3A, 40V Switch

Product Detail

Evaluation circuit EVAL-LT8333-AZ features the LT8333 in a SEPIC configuration. It operates with a switching frequency of 2MHz and is designed to convert a 3V to 26V source to 12V output. The converter can output up to 1.25A depending on the input voltage (see Figure 3 in the demo manual, maximum output current vs VIN curve).

This evaluation circuit features Spread Spectrum Frequency Modulation (SSFM) and EMI filters to provide optimum EMI performance. This PCB layout is optimized for good EMI performance and small solution size. The evaluation board contains a selectable jumper, JP1, to aid in the selection of the desired SYNC pin mode of operation. At light load, either pulse-skipping (PULSE SKIP) or low-ripple Burst Mode® operation (BURST) can be selected to improve the efficiency.

The LT8333 boost/SEPIC/inverting converter IC operates over an input range of 2.8V to 40V, suitable for automotive, telecom, and industrial applications. The converter provides adjustable and synchronizable operation from 300kHz to 2MHz with SSFM option. The LT8333 packs other popular features such as soft-start, bias pin, input undervoltage lockout. The IC can exhibit a low quiescent current down to 9μA in BURST mode and 1μA in shutdown, which makes it ideal for battery-operated systems. The LT8333 is assembled in a thermally enhanced 10-lead 3mm × 3mm DFN package.

The data sheet gives a complete description of the device, operation, and application information. The data sheet must be read in conjunction with the demo manual for EVAL-LT8333-AZ.

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 1

Figure 1. CN0579 Simplified Block Diagram

Quad-Channel IEPE Vibration Sensor Measurement System

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CN0579

Quad-Channel IEPE Vibration Sensor Measurement System

CN0579

Circuits from the lab

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Quad-Channel IEPE Vibration Sensor Measurement System

Features and Benefits

  • Quad Channel IEPE-Compatible Vibration Sensor Interface
  • Channel Independent Excitation Source and Sensor Bias Removal Circuitry
  • Analog Overvoltage and Undervoltage Protection
  • Sensor Frequency Response from DC up to 54 kHz
  • Synchronized, Full Bandwidth Data Measurement and Capture
View Detailed Reference Design external link

Design & Integration Tools

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