LT8331 - Low IQ Boost/SEPIC/ Flyback/Inverting Converter with 0.5A, 140V Switch

Features

  • Wide Input Voltage Range: 4.5V to 100V
  • Ultralow Quiescent Current and Low Ripple Burst Mode® Operation: IQ = 6μA
  • 0.5A, 140V Power Switch
  • Positive or Negative Output Voltage Programming with a Single Feedback Pin
  • Programmable Frequency (100kHz to 500kHz)
  • Synchronizable to an External Clock
  • BIAS Pin for Higher Efficiency
  • Programmable Undervoltage Lockout (UVLO)
  • Thermally-Enhanced High Voltage MSOP Package

Typical Application

LT8331 Typical Application
LT8331 Typical Application

Description

The LT®8331 is a current mode DC/DC converter with a 140V, 0.5A switch operating from a 4.5V to 100V input. With a unique single feedback pin architecture, it is capable of boost, SEPIC, flyback or inverting configurations. Burst Mode operation consumes as low as 6μA quiescent current to maintain high efficiency at very low output currents, while keeping typical output ripple below 20mV.

The internally-compensated current mode architecture results in stable operation over a wide range of input and output voltages and programmable switching frequencies between 100kHz to 500kHz. A SYNC/MODE pin allows synchronization to an external clock. It can also be used to select between burst or pulse-skipping modes of operation. 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 for controlling inductor current during start-up.

The LT8331 is available in a thermally-enhanced MSOP package with four pins removed for high voltage spacings.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT8331EMSE#PBF MS-16E MSE E 05-08-1871 Yes
LT8331EMSE#TRPBF MS-16E MSE E 05-08-1871 Yes
LT8331IMSE#PBF MS-16E MSE I 05-08-1871 Yes
LT8331IMSE#TRPBF MS-16E MSE I 05-08-1871 Yes


LT8331 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT8331EMSE#PBF MS-16E E $4.22 $2.95 Yes
LT8331EMSE#TRPBF MS-16E E $3.01 Yes
LT8331IMSE#PBF MS-16E I $4.70 $3.29 Yes
LT8331IMSE#TRPBF MS-16E I $3.35 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2275A LT8331 Demo Board | Boost, 10V ≤ VIN ≤ 48V, 120Vout @ up to 80mA $125.00
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Click here to view our complete list of demo boards

Applications

  • Industrial and Automotive
  • Telecom
  • Medical Diagnostic Equipment
  • Portable Electronics

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT8331

LTpowerCAD

The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LT8331

Technical Support