LT4256-1LT4256-2 Series

Positive High Voltage Hot Swap Controller with Open-Circuit Detect

Catalog

Positive High Voltage Hot Swap Controller with Open-Circuit Detect

Part	Applications	Number of Channels	Programmable Features	Package / Case	Package / Case [y]	Package / Case [x]	Voltage - Supply [Min]	Voltage - Supply [Max]	Mounting Type	Operating Temperature [Max]	Operating Temperature [Min]	Current - Supply	Features	Type	Supplier Device Package	Contents	Utilized IC / Part	Secondary Attributes	Primary Attributes	Package / Case	Package / Case
Analog Devices LT4256-1CS8#PBF	General Purpose	1	Current Limit Fault Timeout Slew Rate UVLO	8-SOIC	3.9 mm	0.154 in	10.8 VDC	80 V	Surface Mount	70 °C	0 °C	1.8 mA	Latched Fault	Hot Swap Controller	8-SO
Analog Devices LT4256-2CS8#TRPBF	General Purpose	1	Current Limit Fault Timeout Slew Rate UVLO	8-SOIC	3.9 mm	0.154 in	10.8 VDC	80 V	Surface Mount	70 °C	0 °C	1.8 mA	Auto Retry	Hot Swap Controller	8-SO
Analog Devices DC1354A-B														Power Management		Board(s)	LT4256-2	On-Board LEDs	Auto-Retry
Analog Devices LT4256-2IS8#PBF	General Purpose	1	Current Limit Fault Timeout Slew Rate UVLO	8-SOIC	3.9 mm	0.154 in	10.8 VDC	80 V	Surface Mount	85 °C	-40 °C	1.8 mA	Auto Retry	Hot Swap Controller	8-SO
Analog Devices LT4256-2CS8#PBF	General Purpose	1	Current Limit Fault Timeout Slew Rate UVLO	8-SOIC	3.9 mm	0.154 in	10.8 VDC	80 V	Surface Mount	70 °C	0 °C	1.8 mA	Auto Retry	Hot Swap Controller	8-SO
Analog Devices LT4256-3CGN#PBF	General Purpose	1	Auto Retry Current Limit Fault Timeout Latched Fault OVP Slew Rate UVLO	16-SSOP			10.8 VDC	80 V	Surface Mount	70 °C	0 °C	1.8 mA		Hot Swap Controller	16-SSOP					0.154 in	3.9 mm

Catalog

Positive High Voltage Hot Swap Controller with Open-Circuit Detect

Key Features

• Allows Safe Board Insertion and Removal from a Live Backplane

• Controls Supply Voltage from 10.8V to 80V

• Foldback Current Limiting

• Open Circuit and Overcurrent Fault Detect

• Drives an External N-Channel MOSFET

• Automatic Retry or Latched Off Operation After Overcurrent Fault

• Programmable Supply Voltage Power-Up Rate

• Open MOSFET Detection

• 1% Over and Undervoltage Detection Accuracy

• Available in a 16-Lead SSOP Package

Description

The LT4256-3 is a high voltage Hot Swap™controller that allows a board to be safely inserted and removed from a live backplane. An internal driver controls the high side N-channel MOSFET gate for supply voltages ranging from 10.8V to 80V. The part features an open-circuit detect (OPEN) output that indicates abnormally low load current conditions.The LT4256-3 also features an adjustable analog foldback current limit. If the supply remains in current limit for more than a programmable time, the N-channel MOSFET shuts off, the PWRGD output asserts low and the LT4256-3 either automatically restarts after a time-out delay or latches off until the UV pin is cycled low (depending on the status of the RETRY pin).The PWRGD output indicates when the output voltage rises above a programmed level. An external resistor string from VCCprovides programmable undervoltage and overvoltage protection.The LT4256-3 is available in a 16-lead SSOP package.Retry / Latch OffFeaturesPackageLT4256-1Latch OffUVSO-8LT4256-2RetryUVSO-8LT4256-3Latch Off or RetryUV/OV, Open Circuit DetectSSOP-16ApplicationsHot Board InsertionElectronic Circuit Breaker/Power BussingIndustrial High Side Switch/Circuit Breaker24V/48V Industrial/Alarm SystemsIdeally Suited for 12V, 24V and 48V Distributed Power Systems48V Telecom Systems