LTC3894
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LTC3894

150V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability

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LTspice LTC3894 - Step-Down (Buck) Regulators Download 2.45 KB
Part Models 6
1ku List Price Starting From $3.07
Features
  • Wide Operating VIN Range: 4.5V to 150V
  • Wide VOUT Range: 0.8V to 60V
  • 9μA IQ when Regulating 48VIN to 3.3VOUT
  • 16μA IQ when Regulating 12VIN to 3.3VOUT
  • Very Low Dropout Operation: 100% Duty Cycle
  • Adjustable Input Overvoltage Lockout
  • Programmable PGOOD Undervoltage Monitor
  • RSENSE or Inductor DCR Current Sensing
  • Selectable High Efficiency Burst Mode® Operation or Pulse-Skipping Mode at Light Loads
  • Programmable Fixed Frequency: 50kHz to 850kHz
  • Phase-Lockable Frequency: 75kHz to 800kHz
  • Internal Fixed Soft-Start and External Programmable Soft-Start or Voltage Tracking
  • Strong MOSFET Gate Driver with Selectable Undervoltage Lockout Thresholds
  • Optional External NMOS for Gate Driver Bias in High Power Applications
Additional Details
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The LTC3894 is a high voltage step-down DC/DC switching regulator controller. It drives a P-channel power MOSFET switch allowing 100% duty cycle operation. It enables a low part count, simple, and robust solution for high reliability, high voltage applications.

The LTC3894 operates over a wide input voltage range from 4.5V to 150V and can regulate output voltages from 0.8V to 60V. It offers excellent light load efficiency, drawing only 9μA quiescent current while regulating the output voltage with no load. Its peak current mode, constant frequency architecture provides for good control of switching frequency and output current limit. The switching frequency can be programmed from 50kHz to 850kHz with an external resistor and can be synchronized to an external clock from 75kHz to 800kHz.

The LTC3894 offers programmable output voltage soft-start or tracking. Safety features include overvoltage, overcurrent and overtemperature protection with a power good output monitor with adjustable threshold.

The LTC3894 is available in a thermally enhanced 20-Pin TSSOP package with leads removed to accommodate high voltage creepage and clearance requirements.

Applications

  • Automotive and Industrial Power Systems
  • Telecommunication Power Systems
  • Distributed Power Systems
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file View Data Sheet (Rev.A)
Documentation View All Documentation
LTspice LTC3894 - Step-Down (Buck) Regulators Download 2.45 KB
Part Models 6
1ku List Price Starting From $3.07
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LTC3894

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UPDATED 05/07/2018
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LTC3894: 150V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability Data Sheet (Rev.A)

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UPDATED 05/07/2018
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LTC3894: 100%のデューティ・サイクル性能を持つ150V 低消費電流降圧DC/DCコントローラ データシート

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Documentation

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3894EFE#PBF 20-Lead TSSOP w/ EP external-link
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LTC3894EFE#TRPBF 20-Lead TSSOP w/ EP external-link
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LTC3894HFE#PBF 20-Lead TSSOP w/ EP external-link
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LTC3894HFE#TRPBF 20-Lead TSSOP w/ EP external-link
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LTC3894IFE#PBF 20-Lead TSSOP w/ EP external-link
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LTC3894IFE#TRPBF 20-Lead TSSOP w/ EP external-link
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Apr 6, 2022

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

LTC3894EFE#PBF

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LTC3894EFE#TRPBF

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LTC3894HFE#PBF

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LTC3894HFE#TRPBF

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LTC3894IFE#PBF

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Delta Qualification Matrix

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Mar 28, 2019

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LTC3894 Data Sheet Specification Change

LTC3894EFE#PBF

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LTC3894EFE#TRPBF

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LTC3894HFE#PBF

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LTC3894HFE#TRPBF

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LTC3894IFE#PBF

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Apr 6, 2022

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

LTC3894EFE#PBF

PRODUCTION

LTC3894EFE#TRPBF

PRODUCTION

LTC3894HFE#PBF

PRODUCTION

LTC3894HFE#TRPBF

PRODUCTION

LTC3894IFE#PBF

PRODUCTION

LTC3894IFE#TRPBF

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PCN22_0068_Form

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Material_Report

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Delta Qualification Matrix

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Mar 28, 2019

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LTC3894 Data Sheet Specification Change

LTC3894EFE#PBF

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LTC3894EFE#TRPBF

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LTC3894HFE#PBF

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LTC3894HFE#TRPBF

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LTC3894IFE#PBF

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LTC3894IFE#TRPBF

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2506A

LTC3894 150V Low IQ Step-Down DC/DC Converter with 100% Duty Cycle Capability

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DC2506A

LTC3894 150V Low IQ Step-Down DC/DC Converter with 100% Duty Cycle Capability

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DC2506A
LTC3894 150V Low IQ Step-Down DC/DC Converter with 100% Duty Cycle Capability
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Product Detail

Demonstration circuit 2506A is a high voltage, currentmode DC/DC step-down converter featuring the LTC3894.

The board operates from an input range of 6V to 150V, and provides a 5V, 3A output. The PMOSFET architecture allows it to operate seamlessly up to 100% duty cycle, and function as a saturated switch below the regulation threshold. This application has undervoltage lockout programmed for a 6V minimum input to assure adequate gate drive for the MOSFET. It operates at 150kHz and may be synchronized to an external clock. A soft-start feature controls output voltage slew rate at start-up, reducing current surge and voltage overshoot. Burst Mode operation that improves efficiency at light loads can be enabled with a jumper. A power good output signal is provided.

This board is suitable for a wide range of automotive, telecom, industrial, and other applications. The LTC3894 is available in a thermally enhanced 20-pin TSSOP package with skipped leads to accommodate high voltage creepage and clearance requirements. For other output requirements, see the LTC3894 data sheet or contact the LTC factory.

Resources

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DC2506A - Demo Manual Download

498.49 K

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DC2506A - Schematic Download

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DC2506A - Design Files Download

1.35 M

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DC2506A

LTC3894 150V Low IQ Step-Down DC/DC Converter with 100% Duty Cycle Capability
Tools & Simulations

Tools & Simulations 2

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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LTC3894 - Step-Down (Buck) Regulators Download

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