LT4256-1
LT4256-2

PRODUCTION

Positive High Voltage Hot Swap Controllers

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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
  • Overcurrent Fault Detection
  • Drives an External N-Channel MOSFET
  • Programmable Supply Voltage Power-Up Rate
  • Undervoltage Protection
  • Latch Off Operation Mode (LT4256-1)
  • Automatic Retry (LT4256-2)
  • Available in an 8-Pin SO Package

The LT4256-1/LT4256-2 are high voltage Hot Swap™ controllers that allow a board to be safely inserted and removed from a live backplane. An internal driver drives an external N-channel MOSFET switch to control supply voltages ranging from 10.8V to 80V.

The LT4256-1/LT4256-2 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 and the PWRGD output asserts low. The LT4256-2 automatically restarts after a time-out delay. The LT4256-1 latches off until the UV pin is cycled low.

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

The LT4256 can be used as an upgrade to LT1641 designs.

The LT4256-1 and LT4256-2 are available in an 8-pin SO package that is pin compatible with the LT1641.

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
LT4256-1
LT4256-2
Positive High Voltage Hot Swap Controllers
48V, 2A Hot Swap Controller Product Package 1
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Documentation

Data Sheet 1

User Guide 1

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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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 2

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

eval board
schematic 1
schematic 2
schematic 3
schematic 4
DC1354B

LT1641-1, LT1641-2, LT4256-1, and LT4256-2 Positive High Voltage Hot Swap Controller

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Product Details

Demonstration circuit 1354B is a positive high voltage hot swap controller featuring either the LT®1641-1, LT1641-2, LT4256-1, or LT4256-2.

The board facilitates measurement of transient conditions, steady state operation with different loads, and fault conditions. The Controller responds to fault conditions such as input undervoltage(UV), output power good (PWRGD) fault, and overcurrent and response can be verified by the output voltage (VOUT) LED state and PWRGD pin signal. The LT1641-1 and LT4256-1 latch off if MOSFET shuts off under overcurrent condition, while LT1641-2 and LT4256-2 automatically restart after time-out delay.

The DC1354B contains one hot swap controller, power MOSFET, current sense resistor, enable circuit, input voltage clamp, gate protection circuit, resistive output voltage divider for feedback signal, and three LEDs to indicate the presence of input and output voltages and power good condition.

eval board
schematic 5
DC1354A-A

LT4256-1 Positive High Voltage Hot Swap Controllers with Latch-off (-1)

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Product Details

DC1354A-A: Demo Board for the LT4256-1 Positive High Voltage Hot Swap Controllers


 


eval board
schematic 6
schematic 7
schematic 8
schematic 9
schematic 10
DC1354A-B

LT4256-2 Positive High Voltage Hot Swap Controllers with Auto-Retry(-2)

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Product Details

DC1354A-B: Demo Board for the LT4256-2 Positive High Voltage Hot Swap Controllers


 


eval board
schematic 11
schematic 12
schematic 13
schematic 14
AD-APARDPFW-SL

2-port 10BASE-T1L Arduino Shield with SPoE Power Forwarding

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Features and Benefits

  • Software-controlled Power and Data forwarding
  • Power isolation
  • Multiple SPoE classes
  • Complete connectivity passthrough
  • Compatible with Arduino Mega form-factor
  • Supports daisy chaining with other compatible boards

Product Details

The AD-APARDPFW-SL is a 10BASE-T1L power forwarder with Single Pair Power over Ethernet (SPoE) for development of field devices and applications on an AD-APARD32690-SL platform board. The SPoE powered device (PD) and isolated flyback regulator provide 12V power to the platform board. SPoE Class 10 to 12 (24V nominal) and Class 13 to 14 (55V nominal) are supported.

Designed for use on the AD-APARD32690-SL platform, the AD-APARDPFW-SL hardware features Arduino Mega Form-factor headers, and two 10BASE-T1L ports for connecting to a 10BASE-T1L Power Sourcing Equipment (PSE) such as the AD-RPI-T1LPSE-SL 2-port 10BASE-T1L with SPoE PSE Development Platform.

To allow board stacking and development of field device applications using Arduino shields, the AD-APARDPFWD-SL has extra tall headers that allow other Arduino shields to be stacked on top of it.

The design also features complete power and data isolation to the host AD-APARD32690-SL.

APPLICATIONS

  • Factory automation
  • Process control
  • Intelligent buildings
  • Secure field instruments
  • Internet of Things
DC1354B
LT1641-1, LT1641-2, LT4256-1, and LT4256-2 Positive High Voltage Hot Swap Controller
DC1354B-B Evaluation Board DC1354B-B Evaluation Board - Top View DC1354B-B Evaluation Board - Bottom View DC1354
DC1354A-A
LT4256-1 Positive High Voltage Hot Swap Controllers with Latch-off (-1)
DC1354A-A - Schematic
DC1354A-B
LT4256-2 Positive High Voltage Hot Swap Controllers with Auto-Retry(-2)
DC1354A-B Demo Board DC1354A-B Demo Board DC1354A-B Demo Board DC1354A-B Demo Board DC1354A-A - Schematic
AD-APARDPFW-SL
2-port 10BASE-T1L Arduino Shield with SPoE Power Forwarding
AD-APARDPFW-SL Evaluation Board Photo Angle View AD-APARDPFW-SL Evaluation Board Photo Top View AD-APARDPFW-SL Evaluation Board Photo Bottom View AD-APARDPFW-SL Block Diagram

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