LT1641

Supply Voltage (VCC) ...............................0.3V to 100V
Input Voltage (SENSE) .............................0.3V to 100V
Input Voltage (TIMER) ...............................0.3V to 44V
Input Voltage (FB, ON) ...............................0.3V to 60V
Output Voltage (PWRGD) ........................0.3V to 100V
Output Voltage (GATE) ............................0.3V to 100V
Operating Temperature Range
LT1641CS8 ............................................. 0°C to 70°C
LT1641IS8.......................................... 40°C to 85°C
Storage Temperature Range ............. 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C


Description

The LT®1641 is an 8-pin Hot SwapTM controller that allows a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, the board supply voltage can be ramped up at a programmable rate. A high side switch driver controls an N-channel gate for supply voltages ranging from 9V to 80V. The chip features a programmable analog foldback current limit circuit. If the chip remains in current limit for more than a programmable time, the N-channel pass transistor latches off and is optionally set to automatically restart after a time-out delay. The PWRGD output indicates when the output voltage, sensed by the FB pin, is within tolerance. The ON pin provides programmable undervoltage lockout. The LT1641 is available in the 8-lead SO package.