Linear Technology's LTC4253 is a -48 V hot swap controller that protects telecom and high availability server boards and also enables three DC/DC converters in sequence.
Applications using distributed -48 V over the backplane use separate DC/DC converters on each board to generate the local supplies.
The controller allows these boards to be safely inserted or removed with no downtime and provides the sequencing for ASICs, FPGAs and DSP I/O and core supplies.
It features a circuit breaker that controls the primary current to the board in three ways. A slight over-current condition will trip the circuit breaker if it persists for a programmed timer period.
Larger over-current conditions will be controlled through active current limiting, maintaining a safe power level in the MOSFET.
The under and overvoltage level monitor pins allow the user to define the operating voltage range for the system. It can operate from at least -15 V to very high negative voltages due to its floating topology.
It is available in a 16 pin SSOP package.
Phone: 02 8832 3000
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