• Product introduction

LT1641-2IS8

Positive high voltage hot-swap controller

peculiarity

• Allows insertion and removal from the Live Backplane Safety Authority
• Control supply voltages from 9V to 80V
• Programmable analog foldback current limit
• One external N-channel high-side driver
• Automatic retry feature
• User-programmable supply voltage to power ratio
• Undervoltage lockout
• Overvoltage protection
• Available in 8-lead SO package

description

® The LT 1641 is an 8-pin hot-swap ™ controller that allows boards to be safely inserted and removed from a live backplane. Using an external N-channel transistor, the board's supply voltage can be held at a programmable rate. A high-side switching driver controls a voltage N-channel gate with supply voltages ranging from 9V to 80V.

The chip features a programmable analog foldback current limit. If the chip remains at a programmable time current limit, turn off the N-channel transistor and optionally set a timeout delay after an automatic restart.

The PWRGD output indicates when the output voltage FB pin senses that it is within tolerance. The ON pin provides programmable undervoltage lockout.

The LT1641-1/LT1641-2 are recommended for new designs.

The LT1641 is available in an 8-lead SO package.