LT4256-3

RECOMMENDED FOR NEW DESIGNS

Positive High Voltage Hot Swap Controller with Open-Circuit Detect

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Overview

  • Allows Safe Board Insertion and Removal from a Live Backplane
  • Controls Supply Voltage from 10.8V to 80V
  • Foldback Current Limiting
  • Open Circuit and Overcurrent Fault Detect
  • Drives an External N-Channel MOSFET
  • Automatic Retry or Latched Off Operation After Overcurrent Fault
  • Programmable Supply Voltage Power-Up Rate
  • Open MOSFET Detection
  • 1% Over and Undervoltage Detection Accuracy
  • Available in a 16-Lead SSOP Package

The LT4256-3 is a high voltage Hot Swap™ controller that allows a board to be safely inserted and removed from a live backplane. An internal driver controls the high side N-channel MOSFET gate for supply voltages ranging from 10.8V to 80V. The part features an open-circuit detect (OPEN) output that indicates abnormally low load current conditions.

The LT4256-3 also features an adjustable analog foldback current limit. If the supply remains in current limit for more than a programmable time, the N-channel MOSFET shuts off, the PWRGD output asserts low and the LT4256-3 either automatically restarts after a time-out delay or latches off until the UV pin is cycled low (depending on the status of the RETRY pin).

The PWRGD output indicates when the output voltage rises above a programmed level. An external resistor string from VCC provides programmable undervoltage and overvoltage protection.

The LT4256-3 is available in a 16-lead SSOP package.

Retry / Latch Off Features Package
LT4256-1 Latch Off UV SO-8
LT4256-2 Retry UV SO-8
LT4256-3 Latch Off or Retry UV/OV, Open Circuit Detect SSOP-16

Applications

  • Hot Board Insertion
  • Electronic Circuit Breaker/Power Bussing
  • Industrial High Side Switch/Circuit Breaker
  • 24V/48V Industrial/Alarm Systems
  • Ideally Suited for 12V, 24V and 48V Distributed Power Systems
  • 48V Telecom Systems
LT4256-3
Positive High Voltage Hot Swap Controller with Open-Circuit Detect
48V, 2A Hot Swap Controller LT4256-3 Start-Up Behavior Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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Hardware Ecosystem

Parts Product Life Cycle Description
Protection Switches & Controllers 1
LTC4260
RECOMMENDED FOR NEW DESIGNS Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LT4256-1
  • LT4256-2
  • LT4256-3
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.

Evaluation Kits

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schematic 1
DC684A

LT4256-3 Positive Voltage Hot Swap Controller

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Product Details

DC684A Demo Board for:
LT4256-3 Positive High Voltage Hot Swap Controller with Open-Circuit Detect
LT4254 -Positive High Voltage Hot Swap Controller with Open-Circuit Detect


 
DC684A
LT4256-3 Positive Voltage Hot Swap Controller
DC684A - Schematic

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