LT3800
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LT3800

High-Voltage Synchronous Current Mode Step-Down Controller

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Info: : PRODUCTION tooltip
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Part Details
Part Models 4
1ku List Price Starting From $4.15
Features
  • Wide 4V to 60V Input Voltage Range
  • Output Voltages up to 36V
  • Adaptive Nonoverlap Circuitry Prevents Switch Shoot-Through
  • Reverse Inductor Current Inhibit for Discontinuous Operation Improves Efficiency with Light Loads
  • Output Slew Rate Controlled Soft-Start with Auto-Reset
  • 100µA No Load Quiescent Current
  • Low 10µA Current Shutdown
  • 1% Regulation Accuracy
  • 200kHz Operating Frequency
  • Standard Gate N-Channel Power MOSFETs
  • Current Limit Unaffected by Duty Cycle
  • Reverse Overcurrent Protection
  • 16-Lead Thermally Enhanced TSSOP Package
Additional Details
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The LT3800 is a 200kHz fixed frequency high voltage synchronous current mode step-down switching regulator controller. The IC drives standard gate N-channel power MOSFETs and can operate with input voltages from 4V to 60V. An onboard regulator provides IC power directly from VIN and provides for output-derived power to minimize VIN quiescent current. MOSFET drivers employ an internal dynamic bootstrap feature, maximizing gate-source "ON" voltages during normal operation for improved operating efficiencies. The LT3800 incorporates Burst Mode operation, which reduces no load quiescent current to under 100µA. Light load efficiencies are also improved through a reverse inductor current inhibit, allowing the controller to support discontinuous operation. Both Burst Mode operation and the reverse-current inhibit features can be disabled if desired. The LT3800 incorporates a programmable soft-start that directly controls the voltage slew rate of the converter output for reduced startup surge currents and overshoot errors. The LT3800 is available in a 16-lead thermally enhanced TSSOP package.

Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258.

Applications

  • 12V and 42V Automotive and Heavy Equipment
  • 48V Telecom Power Supplies
  • Avionics and Industrial Control Systems
  • Distributed Power Converters
Part Models 4
1ku List Price Starting From $4.15

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT3800EFE#PBF
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LT3800EFE#TRPBF
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LT3800IFE#PBF
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LT3800IFE#TRPBF
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Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3800EFE#PBF

PRODUCTION

LT3800EFE#TRPBF

PRODUCTION

LT3800IFE#PBF

PRODUCTION

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PRODUCTION

Filter by Model

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Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3800EFE#PBF

PRODUCTION

LT3800EFE#TRPBF

PRODUCTION

LT3800IFE#PBF

PRODUCTION

LT3800IFE#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC720A

LT3800EFE Demo Board | VIN = 20V to 55V, VOUT = 12V @ 6.25A

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DC720A

LT3800EFE Demo Board | VIN = 20V to 55V, VOUT = 12V @ 6.25A

LT3800EFE Demo Board | VIN = 20V to 55V, VOUT = 12V @ 6.25A

Product Detail

Demonstration Circuit 720 is a 200kHz high voltage, synchronous current-mode DC/DC step-down converter featuring the LT3800. The board operates from a Vin range of 20V –to 55V and outputs 12V @ 6.25A (75W).



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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