LTC4251B Series

Negative Voltage Hot Swap Controllers in SOT-23

Catalog

Negative Voltage Hot Swap Controllers in SOT-23

Part	Voltage - Supply [Min]	Voltage - Supply [Max]	Mounting Type	Applications	Features	Package / Case	Current - Supply	Type	Programmable Features	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package	Number of Channels	Internal Switch(s)
Analog Devices LTC4251IS6#TRPBF	-75 V	-43 V	Surface Mount	-48 V	Latched Fault	SOT-23-6 Thin TSOT-23-6	800 çA	Hot Swap Controller	Circuit Breaker Current Limit Fault Timeout OVP UVLO	85 °C	-40 °C	TSOT-23-6	1
Analog Devices LTC4251-1CS6#TRPBF	-72 V	-36 V	Surface Mount	-48 V	Latched Fault	SOT-23-6 Thin TSOT-23-6	800 çA	Hot Swap Controller	Circuit Breaker Current Limit Fault Timeout OVP UVLO	70 °C	0 °C	TSOT-23-6	1
Analog Devices LTC4251-1CS6#TRPBF	-72 V	-36 V	Surface Mount	-48 V	Latched Fault OVP UVLO	SOT-23-6 Thin TSOT-23-6	800 çA	Hot Swap Controller	Circuit Breaker Current Limit Fault Timeout OVP UVLO	70 °C	0 °C	TSOT-23-6	1	Both
Analog Devices LTC4251BIS6#TRPBF	-75 V	-43 V	Surface Mount	-48 V	Latched Fault	SOT-23-6 Thin TSOT-23-6	800 çA	Hot Swap Controller	Circuit Breaker Current Limit Fault Timeout OVP UVLO	85 °C	-40 °C	TSOT-23-6	1
Analog Devices LTC4251BIS6-2#TRPBF	-75 V	-43 V	Surface Mount	-48 V	Latched Fault	SOT-23-6 Thin TSOT-23-6	800 çA	Hot Swap Controller	Circuit Breaker Current Limit Fault Timeout OVP UVLO	85 °C	-40 °C	TSOT-23-6	1
Analog Devices LTC4251-2IS6#TRPBF	-72 V	-43 V	Surface Mount	-48 V	Latched Fault	SOT-23-6 Thin TSOT-23-6	800 çA	Hot Swap Controller	Circuit Breaker Current Limit Fault Timeout OVP UVLO	85 °C	-40 °C	TSOT-23-6	1
Analog Devices LTC4251BIS6#TRMPBF	-75 V	-43 V	Surface Mount	-48 V	Latched Fault	SOT-23-6 Thin TSOT-23-6	800 çA	Hot Swap Controller	Circuit Breaker Current Limit Fault Timeout OVP UVLO	85 °C	-40 °C	TSOT-23-6	1
Analog Devices LTC4251BCS6-1#TRMPBF	-72 V	-36 V	Surface Mount	-48 V	Latched Fault	SOT-23-6 Thin TSOT-23-6	800 çA	Hot Swap Controller	Circuit Breaker Current Limit Fault Timeout OVP UVLO	70 °C	0 °C	TSOT-23-6	1

Catalog

Negative Voltage Hot Swap Controllers in SOT-23

Key Features

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

• Floating Topology Permits Very High Voltage Operation

• Programmable Analog Current Limit with Circuit Breaker Timer

• Fast Response Time Limits Peak Fault Current

• Improved Ruggedness Shunt Regulator

• Programmable Timer

• Programmable Undervoltage/Overvoltage Protection

• Low Profile 6-Lead SOT-23 (ThinSOT™) Package

Description

The LTC4251B/LTC4251B-1/LTC4251B-2 negative voltage Hot Swap™controllers allow a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault conditions.Programmable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the desired operating range. The supply input is shunt regulated, allowing safe operation with very high supply voltages. A multifunction timer delays initial start-up and controls the circuit breaker’s response time.The LTC4251B UV/OV thresholds are designed to match the standard telecom operating range of –43V to –75V. The LTC4251B-1 UV/OV thresholds extend the operating range to encompass –36V to –72V. The LTC4251B-2 implements a UV threshold of –43V only. The LTC4251B improves the ruggedness of the LTC4251 shunt regulator.UV/OVLTC4251–43V/–75VLTC4251-1–36V/–72VLTC4251-2–43V UV OnlyLTC4251B–43V/–75VLTC4251B-1–36V/–72VLTC4251B-2–43V UV OnlyApplicationsHot Board InsertionElectronic Circuit Breaker–48V Distributed Power SystemsNegative Power Supply ControlCentral Office SwitchingProgrammable Current Limiting CircuitHigh Availability ServersDisk Arrays