LT1641-1CS8

Hot Swap Controller 1CH 80V N-Channel Positive High Voltage 8Pin SOIC N

DESCRIPTION

The LT®1641-1/LT1641-2 are 8-pin Hot SwapTM control lers that allow 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 chips feature a programmable analog foldback current limit circuit. If the chips remain in current limit for more than a programmable time, the N-channel pass transistor is either latched off LT1641-1 or is set to automatically restart after a time-out delay LT1641-2. The PWRGD output indicates when the output voltage, sensed by the FB pin, is within tolerance. The ON pin provides programmable undervoltage lockout.

The LT1641-1/LT1641-2 are available in the 8-lead SO package.

FEATURES

■ Allows Safe Board Insertion and Removal from a Live Backplane

■ Controls Supply Voltage from 9V to 80V

■ Programmable Analog Foldback Current Limiting

■ High Side Drive for an External N-Channel

■ Latched Operation Mode LT1641-1

■ Automatic Retry LT1641-2

■ User Programmable Supply Voltage Power-Up Rate

■ Undervoltage Lockout

■ Overvoltage Protection

■ Both are available in 8-Lead SO Package

APPLICATIONS

■ Hot Board Insertion

■ Electronic Circuit Breaker

■ Industrial High Side Switch/Circuit Breaker

■ 24V/48V Industrial/Alarm Systems