LT4256-1
LT4256-2
Info : RECOMMENDED FOR NEW DESIGNS
searchIcon
cartIcon

LT4256-1
LT4256-2

Positive High Voltage Hot Swap Controllers

Show More showmore-icon

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 8
1ku List Price Starting From $2.34
Features
  • 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
Additional Details
show more Icon

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
Part Models 8
1ku List Price Starting From $2.34

close icon
Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT4256-1CS8#PBF
  • HTML
  • HTML
LT4256-1CS8#TRPBF
  • HTML
  • HTML
LT4256-1IS8#PBF
  • HTML
  • HTML
LT4256-1IS8#TRPBF
  • HTML
  • HTML
LT4256-2CS8#PBF
  • HTML
  • HTML
LT4256-2CS8#TRPBF
  • HTML
  • HTML
LT4256-2IS8#PBF
  • HTML
  • HTML
LT4256-2IS8#TRPBF
  • HTML
  • HTML

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Jun 16, 2021

- 21_0026

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT4256-1CS8#PBF

PRODUCTION

LT4256-1CS8#TRPBF

PRODUCTION

LT4256-1IS8#PBF

PRODUCTION

LT4256-1IS8#TRPBF

PRODUCTION

LT4256-2CS8#PBF

PRODUCTION

LT4256-2CS8#TRPBF

PRODUCTION

LT4256-2IS8#PBF

PRODUCTION

LT4256-2IS8#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Jun 16, 2021

- 21_0026

arrow down

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT4256-1CS8#PBF

PRODUCTION

LT4256-1CS8#TRPBF

PRODUCTION

LT4256-1IS8#PBF

PRODUCTION

LT4256-1IS8#TRPBF

PRODUCTION

LT4256-2CS8#PBF

PRODUCTION

LT4256-2CS8#TRPBF

PRODUCTION

LT4256-2IS8#PBF

PRODUCTION

LT4256-2IS8#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 3

reference details image

DC1354A-A

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

reference details image

DC1354A-B

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

reference details image

DC1354B

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

zoom

DC1354B

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

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

Product Detail

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.

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.

Recently Viewed