LT4250 Series

Negative 48V Hot Swap Controller

Catalog

Negative 48V Hot Swap Controller

Part	Mounting Type	Programmable Features	Number of Channels	Current - Supply	Voltage - Supply [Min]	Voltage - Supply [Max]	Package / Case	Package / Case	Package / Case	Applications	Operating Temperature [Max]	Operating Temperature [Min]	Type	Supplier Device Package	Features	Package / Case [y]	Package / Case [x]
Analog Devices LT4250HCN8#PBF	Through Hole	Current Limit Latched Fault OVP UVLO	1	1.6 mA	-80 V	18 V	0.3 in	8-DIP	7.62 mm	-48 V	70 °C	0 °C	Hot Swap Controller	8-PDIP	Fault Timeout
Analog Devices LT4250LCN8#PBF	Through Hole	Current Limit Latched Fault OVP UVLO	1	1.6 mA	-80 V	18 V	0.3 in	8-DIP	7.62 mm	-48 V	70 °C	0 °C	Hot Swap Controller	8-PDIP	Fault Timeout
Analog Devices LT4250LCN8#PBF	Through Hole	Current Limit Latched Fault OVP UVLO	1	1.6 mA	-80 V	18 V	0.3 in	8-DIP	7.62 mm	-48 V	70 °C	0 °C	Hot Swap Controller	8-PDIP	Fault Timeout
Analog Devices LT4250HCN8#PBF	Through Hole	Current Limit Latched Fault OVP UVLO	1	1.6 mA	-80 V	18 V	0.3 in	8-DIP	7.62 mm	-48 V	70 °C	0 °C	Hot Swap Controller	8-PDIP	Fault Timeout
Analog Devices LT4250LIS8#TRPBF	Surface Mount	Current Limit Latched Fault OVP UVLO	1	1.6 mA	-80 V	18 V		8-SOIC		-48 V	85 °C	-40 °C	Hot Swap Controller	8-SO	Fault Timeout	3.9 mm	0.154 in

Catalog

Negative 48V Hot Swap Controller

Key Features

• Allows Safe Board Insertion and Removal from a Live –48V Backplane

• Circuit Breaker Immunity to Voltage Steps and Current Spikes

• Programmable Inrush and Short-Circuit Current Limits

• Pin Compatible with LT1640L/LT1640H

• Operates from –18V to –80V

• Programmable Overvoltage Protection

• Programmable Undervoltage Lockout

• Power Good Control Output

• Bell-Core CompatibleON/OFF Threshold

Description

The LT4250L/LT4250H are 8-pin, negative 48V Hot Swap™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. ThePWRGD(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 packagesApplicationsCentral Office Switching–48V Distributed Power SystemsNegative Power Supply Control