LT4256-3

Features: Allows Safe Board Insertion and Removal from a Live BackplaneControls 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 Sup...

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SeekIC No. : 004401173 Detail

LT4256-3: Features: Allows Safe Board Insertion and Removal from a Live BackplaneControls Supply Voltage from 10.8V to 80V Foldback Current Limiting Open Circuit and Overcurrent Fault Detect Drives an Externa...

floor Price/Ceiling Price

Part Number:
LT4256-3
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/3/28

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Product Details

Description



Features:

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



Application

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



Pinout

  Connection Diagram


Specifications

Supply Voltage (VCC) ................................  0.3 to 100V
SENSE, PWRGD ....................................... 0.3 to 100V
GATE Voltage (Note 2) .................... 0.3V to VCC + 10V
GATE Maximum Current ..................................... 200mA
VOUT .......................................................... 3V to 100V
FB, UV, OPEN ............................................. 0.3 to 44V
OV .............................................................. 0.3 to 18V
RETRY ........................................................ 0.3 to 15V
TIMER Voltage ......................................... 0.3V to 4.3V
Maximum Input Current (TIMER) ....................... 100mA
Operating Temperature
LT4256-3C ............................................. 0°C to 70°C
LT4256-3I ......................................... 40°C to 85°C
Storage Temperature Range ................ 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C



Description

The LT®4256-3 is a high voltage Hot SwapTM controller that allows a board to be safely inserted and removed from  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.  LTC and LT are registered trademarks of Linear Technology Corporation.




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