The LT 1640L/LT1640H is an 8-pin, negative voltage HotSwapTMcontroller that allows a board to be safely insertedand removed from a live backplane. Inrush current islimited to a programmable value by controlling the gatevoltage of an external N-channel pass transistor. The passtransistor is turned off if the input voltage is less than theprogrammable undervoltage threshold or greater than theovervoltage threshold. A programmable electronic circuitbreaker protects the system against shorts. The PWRGD(LTC1640L) or PWRGD (LTC1640H) signal can be used todirectly enable a power module. The LT1640L is designedfor modules with a low enable input and the LT1640H formodules with a high enable input.
The LT1640L/LT1640H is available in 8-pin PDIP and SOpackages.
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Central Office Switching 48V Distributed Power Systems Negative Power Supply Control
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Allows Safe Board Insertion and Removalfrom a Live 48V Backplane Operates from 10V to 80V Programmable Inrush Current Programmable Electronic Circuit Breaker Programmable Overvoltage Protection Programmable Undervoltage Lockout Power Good Control Output
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Supply Voltage (VDD VEE) ................ 0.3V to 100V
DRAIN, PWRGD, PWRGD Pins ............... 0.3V to 100V
SENSE, GATE Pins .................................. 0.3V to 20V
UV, OV Pins .............................................0.3V to 60V
Maximum Junction Temperature ...................... 125°C
Operating Temperature Range
LT1640LC/LT1640HC ............................ 0°C to 70°C
LT1640LI/LT1640HI .......................... 40°C to 85°C
Storage Temperature Range .......... 65°C to 150°C
Lead Temperature (Soldering, 10 sec) ............ 300°C
Post a Buying Lead
Required Field 
