LT4250H

Features: Allows Safe Board Insertion and Removal from a Live 48V Backplane Circuit Breaker Immunity to Voltage Steps and Current SpikesProgrammable Inrush and Short-Circuit Current Limits Pin Compatible with LT1640L/LT1640H Operates from 20V to 80V Programmable Overvoltage Protection Programmab...

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SeekIC No. : 004401168 Detail

LT4250H: Features: Allows Safe Board Insertion and Removal from a Live 48V Backplane Circuit Breaker Immunity to Voltage Steps and Current SpikesProgrammable Inrush and Short-Circuit Current Limits Pin Com...

floor Price/Ceiling Price

Part Number:
LT4250H
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: 2024/3/27

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Product Details

Description



Features:

Allows Safe Board Insertion and Removal from a Live 48V Backplane
Circuit Breaker Immunity to Voltage Steps and Current Spikes
Programmable Inrush and Short-Circuit Current Limits
Pin Compatible with LT1640L/LT1640H
Operates from 20V to 80V
Programmable Overvoltage Protection
Programmable Undervoltage Lockout
Power Good Control Output
 Bell-Core Compatible ON/OFF Threshold



Application

Central Office Switching
48V Distributed Power Systems
 Negative Power Supply Control



Specifications

Supply Voltage (VDD  VEE) ................ . 0.3V to 100V
PWRGD, PWRGD Pins ........................... 0.3V to 100V
SENSE, GATE Pins .................................... 0.3V to 20V
UV, OV Pins ..............................................0.3V to 60V
DRAIN Pin ................................................. 2V to 100V
Maximum Junction Temperature .........................125°C
Operating Temperature Range
LT4250LC/LT4250HC ............................. 0°C to 70°C
LT4250LI/LT4250HI .......................... 40°C to 85°C
Storage Temperature Range ............ 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................300°C



Description

The LT®4250L/LT4250H are 8-pin, negative 48V Hot SwapTM controllers that allow a board to be safely inserted and removed from a live backplane. Inrush current is limited to a programmable value by controlling the gate voltage of an external N-channel pass transistor. The pass transistor is turned off if the input voltage is less than the programmable undervoltage threshold or greater than the overvoltage threshold. A programmable current limit protects the system against shorts. After a 500ms timeout the current limit activates the electronic circuit breaker. The PWRGD (LT4250L) or PWRGD (LT4250H) signal can be used to directly enable a power module. The LT4250L is designed for modules with a low enable input and the LT4250H for modules with a high enable input.

The LT4250L/LT4250H are available in 8-pin PDIP and SO packages.




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