LTC4252BLTC4252C Series

Negative Voltage Hot Swap Controllers

Catalog

Negative Voltage Hot Swap Controllers

Part	Number of Channels	Package / Case	Package / Case [custom]	Package / Case	Mounting Type	Programmable Features	Current - Supply	Operating Temperature [Max]	Operating Temperature [Min]	Applications	Features	Type	Supplier Device Package	Package / Case [x]	Package / Case [x]
Analog Devices LTC4252-1CMS8#TRPBF	1	8-MSOP 8-TSSOP	0.118 in	3 mm	Surface Mount	Current Limit Fault Timeout OVP UVLO	800 çA	70 °C	0 °C	-48 V	Latched Fault	Hot Swap Controller	8-MSOP
Analog Devices LTC4252-2CMS#PBF	1	10-MSOP 10-TFSOP			Surface Mount	Current Limit Fault Timeout OVP UVLO	800 çA	70 °C	0 °C	-48 V	Auto Retry	Hot Swap Controller	10-MSOP	3 mm	0.118 in
Analog Devices LTC4252-2CMS8#PBF	1	8-MSOP 8-TSSOP	0.118 in	3 mm	Surface Mount	Current Limit Fault Timeout OVP UVLO	800 çA	70 °C	0 °C	-48 V	Auto Retry	Hot Swap Controller	8-MSOP
Analog Devices LTC4252BIMS-1#TRPBF	1	10-MSOP 10-TFSOP			Surface Mount	Current Limit Fault Timeout OVP UVLO	800 çA	85 °C	-40 °C	-48 V	Latched Fault	Hot Swap Controller	10-MSOP	3 mm	0.118 in
Analog Devices LTC4252CCMS-1#PBF	1	10-MSOP 10-TFSOP			Surface Mount	Current Limit Fault Timeout OVP UVLO	900 µA	70 °C	0 °C	-48 V	Latched Fault	Hot Swap Controller	10-MSOP	3 mm	0.118 in
Analog Devices LTC4252BCMS8-1#PBF	1	8-MSOP 8-TSSOP	0.118 in	3 mm	Surface Mount	Current Limit Fault Timeout OVP UVLO	800 çA	70 °C	0 °C	-48 V	Latched Fault	Hot Swap Controller	8-MSOP
Analog Devices LTC4252BIMS-2#PBF	1	10-MSOP 10-TFSOP			Surface Mount	Current Limit Fault Timeout OVP UVLO	800 çA	85 °C	-40 °C	-48 V	Auto Retry	Hot Swap Controller	10-MSOP	3 mm	0.118 in
Analog Devices LTC4252CIMS-1#PBF	1	10-MSOP 10-TFSOP			Surface Mount	Current Limit Fault Timeout OVP UVLO	900 µA	85 °C	-40 °C	-48 V	Latched Fault	Hot Swap Controller	10-MSOP	3 mm	0.118 in
Analog Devices LTC4252BCMS8-2#PBF	1	8-MSOP 8-TSSOP	0.118 in	3 mm	Surface Mount	Current Limit Fault Timeout OVP UVLO	800 çA	70 °C	0 °C	-48 V	Auto Retry	Hot Swap Controller	8-MSOP
Analog Devices LTC4252-2CMS#TRPBF	1	10-MSOP 10-TFSOP			Surface Mount	Current Limit Fault Timeout OVP UVLO	800 çA	70 °C	0 °C	-48 V	Auto Retry	Hot Swap Controller	10-MSOP	3 mm	0.118 in

Key Features

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

• Floating Topology Permits Very High Voltage Operation

• Current Limit With Circuit Breaker Timer

• Fast Response Time Limits Peak Fault Current

• Programmable Soft-Start Current Limit

• Programmable Timer with Drain Voltage Accelerated Response

• ±1% Undervoltage/Overvoltage Threshold (LTC4252C)

• Improved Ruggedness Shunt Regulator

• Adjustable Undervoltage/Overvoltage Protection

• LTC4252B-1/LTC4252C-1: Latch Off After Fault

• LTC4252B-2/LTC4252C-2: Automatic Retry After Fault

• Available in 8-Pin and 10-Pin MSOP Packages

Description

The LTC4252 negative voltage Hot Swap™controller allows 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.Adjustable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the desired operating range. The LTC4252’s supply input is shunt regulated, allowing safe operation with very high supply voltages. A multifunction timer delays initial startup and controls the circuit breaker’s response time. The circuit breaker’s response time is accelerated by sensing excessive MOSFET drain voltage, keeping the MOSFET within its safe operating area (SOA). An adjustable softstart circuit controls MOSFET inrush current at start-up.The LTC4252-1/LTC4252A-1 latch off after a circuit breaker fault times out. The LTC4252-2/LTC4252A-2 provide automatic retry after a fault. The LTC4252A-1/LTC4252A-2 feature tight ±1% undervoltage/overvoltage threshold accuracy. The LTC4252 is available in either an 8-pin or 10-pin MSOP, while the LTC4252A is available in the 10-pin MSOP.UV/OV %Latch Off/RetryPackageLTC4252-14.6%Latch offMS-8, MS-10LTC4252-24.8%RetryMS-8, MS-10LTC4252A-11%Latch offMS-10LTC4252A-21%RetryMS-10LTC4252B-14.6%Latch offMS-8, MS-10LTC4252B-24.6%RetryMS-8, MS-10LTC4252C-11%Latch offMS-10LTC4252C-21%RetryMS-10ApplicationsHot Board InsertionElectronic Circuit Breaker–48V Distributed Power SystemsNegative Power Supply ControlCentral Office SwitchingHigh Availability ServersATCA