LT4250H

LT4250L/LT4250H Negative 48V Hot Swap Controller FEATURES Allows Safe Board Insertion and Removal from a Live – 48V Backplane s Circuit Breaker Immunity to Voltage Steps and Current Spikes s Programmable Inrush and www.DataSheet4U.com Short-Circuit Current Limits s Pin Compatible with LT1640L/LT1640H s Operates from –20V to – 80V s Programmable Overvoltage Protection s Programmable Undervoltage Lockout s Power Good Control Output s Bell-Core Compatible ON/OFF Threshold s DESCRIPTIO U APPLICATIO S s s s The LT®4250L/LT4250H are 8-pin, negative 48V Hot SwapTM controllers that allow a board to be safely inserted and removed from a live backplane. Inrush current is limited to a programmable value by controlling the gate voltage of an external N-channel pass transistor. The pass transistor is turned off if the input voltage is less than the programmable undervoltage threshold or greater than the overvoltage threshold. A programmable current limit protects the system against shorts. After a 500µs timeout the current limit activates the electronic circuit breaker. The PWRGD (LT4250L) or PWRGD (LT4250H) signal can be used to directly enable a power module. The LT4250L is designed for modules with a low enable input and the LT4250H for modules with a high enable input. The LT4250L/LT4250H are available in 8-pin PDIP and SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. Central Office Swi...