LT8304/LT8304-1 - 100VIN Micropower No-Opto Isolated Flyback Converter with 150V/2A Switch

Features

  • 3V to 100V Input Voltage Range
  • 2A, 150V Internal DMOS Power Switch
  • Low Quiescent Current:
    116μA in Sleep Mode
    390μA in Active Mode
  • Quasi-Resonant Boundary Mode Operation at Heavy Load
  • Low Ripple Burst Mode® Operation at Light Load
  • Minimum Load < 0.5% (Typ) of Full Output
  • No Transformer Third Winding or Opto-Isolator
  • Required for Output Voltage Regulation
  • Accurate EN/UVLO Threshold and Hysteresis
  • Internal Compensation and Soft-Start
  • Temperature Compensation for Output Diode
  • Output Short-Circuit Protection
  • Thermally Enhanced 8-Lead SO Package

Typical Application

LT8304 Typical Application
LT8304 Typical Application

Description

The LT®8304/LT8304-1 are monolithic micropower isolated flyback converters. By sampling the isolated output voltage directly from the primary-side flyback waveform, the parts require no third winding or opto-isolator for regulation. The output voltage is programmed with two external resistors and a third optional temperature compensation resistor. Boundary mode operation provides a small magnetic solution with excellent load regulation. Low ripple Burst Mode operation maintains high efficiency at light load while minimizing the output voltage ripple. A 2A, 150V DMOS power switch is integrated along with all the high voltage circuitry and control logic into a thermally enhanced 8-lead SO package.

The LT8304/LT8304-1 operate from an input voltage range of 3V to 100V and deliver up to 24W of isolated output power. The high level of integration and the use of boundary and low ripple Burst Mode operation result in a simple to use, low component count, and high efficiency application solution for isolated power delivery. The LT8304-1 is specially optimized for high step-up output applications.

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
LT8304ES8E-1#PBF SO-8E S8E E 05-08-1857 Yes
LT8304ES8E-1#TRPBF SO-8E S8E E 05-08-1857 Yes
LT8304ES8E#PBF SO-8E S8E E 05-08-1857 Yes
LT8304ES8E#TRPBF SO-8E S8E E 05-08-1857 Yes
LT8304HS8E-1#PBF SO-8E S8E H 05-08-1857 Yes
LT8304HS8E-1#TRPBF SO-8E S8E H 05-08-1857 Yes
LT8304HS8E#PBF SO-8E S8E H 05-08-1857 Yes
LT8304HS8E#TRPBF SO-8E S8E H 05-08-1857 Yes
LT8304IS8E-1#PBF SO-8E S8E I 05-08-1857 Yes
LT8304IS8E-1#TRPBF SO-8E S8E I 05-08-1857 Yes
LT8304IS8E#PBF SO-8E S8E I 05-08-1857 Yes
LT8304IS8E#TRPBF SO-8E S8E I 05-08-1857 Yes


LT8304 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
LT8304ES8E-1#PBF SO-8E E $5.07 $3.55 Yes
LT8304ES8E-1#TRPBF SO-8E E $5.13 $3.61 Yes
LT8304ES8E#PBF SO-8E E $5.07 $3.55 Yes
LT8304ES8E#TRPBF SO-8E E $5.13 $3.61 Yes
LT8304HS8E-1#PBF SO-8E H $6.00 $4.20 Yes
LT8304HS8E-1#TRPBF SO-8E H $6.06 $4.26 Yes
LT8304HS8E#PBF SO-8E H $6.00 $4.20 Yes
LT8304HS8E#TRPBF SO-8E H $6.06 $4.26 Yes
LT8304IS8E-1#PBF SO-8E I $5.57 $3.90 Yes
LT8304IS8E-1#TRPBF SO-8E I $5.63 $3.96 Yes
LT8304IS8E#PBF SO-8E I $5.57 $3.90 Yes
LT8304IS8E#TRPBF SO-8E I $5.63 $3.96 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
DC2393A LT8304ES8E Isolated Demo Board | No-Opto Flyback, 18V ≤ VIN ≤ 72V; VOUT = 5V @ 2A to 4.2A $150.00
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Click here to view our complete list of demo boards

Applications

  • Isolated Automotive, Industrial, Medical, Telecom Power Supplies
  • Isolated Auxiliary/Housekeeping Power Supplies

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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:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, 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

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

Models for the following parts are available in LTspice:
LT8304
LT8304-1

Technical Support