LT4250L/LT4250H Negative 48V Hot Swap Controller
FEATURES
Allows Safe Board Insertion and Removal from a Live – 48V Bac...
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 Over
voltage Protection s Programmable Under
voltage Lockout s Power Good Control Output s Bell-Core Compatible ON/OFF Threshold
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DESCRIPTIO
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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 under
voltage threshold or greater than the over
voltage 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.
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