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LTC4251

Features: ` Allows Safe Board Insertion and Removal from a Live 48V Backplane` Floating Topology Permits Very High Voltage Operation` Low Profile (1mm) ThinSOTTM Package` Programmable Analog Current Limit with Circuit Breaker Timer` Fast Response Time Limits Peak Fault Current` Programmable Timer`...

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SeekIC No. : 004402502 Detail

LTC4251: Features: ` Allows Safe Board Insertion and Removal from a Live 48V Backplane` Floating Topology Permits Very High Voltage Operation` Low Profile (1mm) ThinSOTTM Package` Programmable Analog Current...

LTC4251 Data Sheet

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Part Number:
LTC4251
Supply Ability:
5000

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

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Upload time: 2024/11/23

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Product Details

Description



Features:

` Allows Safe Board Insertion and Removal from a Live 48V Backplane
` Floating Topology Permits Very High Voltage Operation
` Low Profile (1mm) ThinSOTTM Package
` Programmable Analog Current Limit with Circuit Breaker Timer
` Fast Response Time Limits Peak Fault Current
` Programmable Timer
` Programmable Undervoltage/Overvoltage Protection


Application

` Hot Board Insertion
` Electronic Circuit Breaker
` 48V Distributed Power Systems
` Negative Power Supply Control
` Central Office Switching
` Programmable Current Limiting Circuit
` High Availability Servers
` Disk Arrays


Pinout

Connection Diagram


Specifications

Current into VIN (100ms Pulse) .......................... 100mA
Minimum VIN Voltage ........................................... 0.3V
Gate, UV/OV, Timer Voltage .......................0.3V to 16V
Sense Voltage ...........................................0.6V to 16V
Current Out of Sense Pin (20s Pulse) ............ 200mA
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range
   LTC4251C/LTC4251-1C/LTC4251-2C ...... 0°C to 70°C
   LTC4251I/LTC4251-1I/LTC4251-2I .... 40°C to 85°C
Storage Temperature Range .............. 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C 


Description

The LTC®4251/LTC4251-1/LTC4251-2 negative voltage Hot SwapTM controllers allow a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault conditions.

Programmable undervoltage and overvoltage detectors of LTC4251 disconnect the load whenever the input supply exceeds the desired operating range. The supply input is shunt regulated, allowing safe operation with very high supply voltages. A multifunction timer delays initial start-up and controls the circuit breaker's response time.

The LTC4251 UV/OV thresholds are designed to match the standard telecom operating range of 43V to 75V. The LTC4251-1 UV/OV thresholds extend the operating range to encompass 36V to 72V. The LTC4251-2 implements a UV threshold of 43V only.

LTC4251 are available in the 6-Pin SOT-23 package.




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