LT1640: Negative Voltage Hot Swap Controller Data Sheet8/27/2007192K
Features and Benefits
- Allows Safe Board Insertion and Removal from a Live –48V Backplane
- Operates from –10V to –80V
- Programmable Inrush Current
- Programmable Electronic Circuit Breaker
- Programmable Overvoltage Protection
- Programmable Undervoltage Lockout
- Power Good Control Output
The LT1640L/LT1640H is an 8-pin, negative voltage Hot Swap™ controller that allows 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 electronic circuit breaker protects the system against shorts. The PWRGD (LTC1640L) or PWRGD (LTC1640H) signal can be used to directly enable a power module. The LT1640L is designed for modules with a low enable input and the LT1640H for modules with a high enable input.
The LT1640L/LT1640H is available in 8-pin PDIP and SO packages.
- Central Office Switching
- –48V Distributed Power Systems
- Negative Power Supply Control
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
R375 Reliability Data3/22/201820 K
Hot Swap Controllers7/13/2017778 K
48 Volt Hot Swap Controller for Negative Voltages8/1/1998 LT Journal
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