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LT4256-2

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 (L...

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LT4256-2: 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 ...

LT4256-2 Data Sheet

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Part Number:
LT4256-2
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
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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
·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


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 (Note 2) ............................... 0.3V to VCC + 10V
Maximum Input Current (GATE) ......................... 200A
FB, UV ........................................................ 0.3 to 44V
TIMER .................................................... 0.3V to 4.3V
Maximum Input Current (TIMER) ....................... 100A
Operating Temperature
LT4256C ................................................. 0°C to 70°C
LT4256I ............................................. 40°C to 85°C
Storage Temperature Range ............ 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C


Description

The LT®4256-1/LT4256-2 are high voltage Hot SwapTM 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. See Table 1 on page 14 for upgraded specifications.

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




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