LTC3894

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. A) Product Selection Table
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Overview

  • 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
LTC3894
150V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability
LTC3894 Application Circuit LTC3894 Performance Graph LTC3894 Pin Configuration
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Documentation

Data Sheet 1

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3894

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTC3894
LTspice

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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
DC2506A

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

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Product Details

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.
DC2506A
LTC3894 150V Low IQ Step-Down DC/DC Converter with 100% Duty Cycle Capability
DC2506A Evaluation Board DC2506A Evaluation Board - Top View DC2506A Evaluation Board - Bottom View DC2506A_UG-1349 Image

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