LT8303
Info : RECOMMENDED FOR NEW DESIGNS
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LT8303

100VIN Micropower Isolated Flyback Converter with 150V/450mA Switch

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 10
1ku List Price Starting From $3.77
Features
  • 5.5V to 100V Input Voltage Range
  • 450mA, 150V Internal DMOS Power Switch
  • Up to 5W of Output Power
  • Low Quiescent Current:
    • 70μA in Sleep Mode
    • 280μA in Active Mode
  • Boundary Mode Operation at Heavy Load
  • Low-Ripple Burst Mode® Operation at Light Load
  • Minimum Load <0.5% (Typ) of Full Output
  • VOUT Set with a Single External Resistor
  • No Transformer Third Winding or Opto-Isolator Required for Regulation
  • Accurate EN/UVLO Threshold and Hysteresis
  • Internal Compensation and Soft-Start
  • 5-Lead TSOT-23 Package
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LT8303 is a micropower high voltage isolated flyback converter. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no third winding or opto-isolator for regulation. The output voltage is programmed with a single external resistor. Internal compensation and soft-start further reduce external component count. 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 450mA, 150V DMOS power switch is integrated along with all high voltage circuitry and control logic into a 5-lead thinSOT package.

The LT8303 operates from an input voltages range of 5.5V to 100V and can deliver up to 5W of isolated output power. The high level of integration and the use of boundary and low ripple burst modes result in a simple to use, low component count, and high efficiency application solution for isolated power delivery.

APPLICATIONS

  • Isolated Telecom, Datacom, Automotive, Industrial, and Medical Power Supplies
  • Isolated Auxiliary/Housekeeping Power Supplies
Part Models 10
1ku List Price Starting From $3.77

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Apr 11, 2019

- 19_0067

Notification of Wafer Fab Location Change for 0.35 BCD Process

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Product Lifecycle

PCN

Apr 11, 2019

- 19_0067

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Notification of Wafer Fab Location Change for 0.35 BCD Process

LT8303ES5#TRMPBF

PRODUCTION

LT8303ES5#TRPBF

PRODUCTION

LT8303HS5#TRMPBF

PRODUCTION

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PRODUCTION

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2490A

LT8303ES5 Isolated Demo Board | No-Opto Flyback, 36V ≤ VIN ≤ 72V, VOUT = 5V @ up to 0.84A

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DC2490A

LT8303ES5 Isolated Demo Board | No-Opto Flyback, 36V ≤ VIN ≤ 72V, VOUT = 5V @ up to 0.84A

LT8303ES5 Isolated Demo Board | No-Opto Flyback, 36V ≤ VIN ≤ 72V, VOUT = 5V @ up to 0.84A

Product Detail

Demonstration circuit 2490A is a micropower no-opto isolated flyback converter featuring the LT8303. This demo circuit outputs 5V, and maintains tight regulation with a load current from 2.5mA to 0.84A over an input voltage from 36V to 72V. The output current capability increases with the input voltage, as shown in the Performance Summary table.

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.

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