LTC4252B
LTC4252C

RECOMMENDED FOR NEW DESIGNS

Negative Voltage Hot Swap Controllers

Part Models: 24
1ku List Price: Starting From $2.79

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Overview

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

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 LTC4252-2 provides automatic retry after a fault. The LTC4252C-1/LTC4252C-2 feature tight ±1% undervoltage/ overvoltage threshold accuracy. The LTC4252 is available in either an 8-pin or 10-pin MSOP.

The LTC4252B and LTC4252C improve the ruggedness of the shunt regulator in the LTC4252 and LTC4252A.


	UV/OV %	Latch Off/Retry	Package
LTC4252-1	4.6%	Latch off	MS-8, MS-10
LTC4252-2	4.8%	Retry	MS-8, MS-10
LTC4252A-1	1%	Latch off	MS-10
LTC4252A-2	1%	Retry	MS-10
LTC4252B-1	4.6%	Latch off	MS-8, MS-10
LTC4252B-2	4.6%	Retry	MS-8, MS-10
LTC4252C-1	1%	Latch off	MS-10
LTC4252C-2	1%	Retry	MS-10

Applications

Hot Board Insertion
Electronic Circuit Breaker
–48V Distributed Power Systems
Negative Power Supply Control
Central Office Switching
High Availability Servers
ATCA

Part Models: 24
1ku List Price: Starting From $2.79

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC4252BCMS-1#PBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BCMS-1#TRPBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BCMS-2#PBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BCMS-2#TRPBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BCMS8-1#PBF	8-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BCMS8-1#TRPBF	8-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BCMS8-2#PBF	8-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BCMS8-2#TRPBF	8-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BIMS-1#PBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BIMS-1#TRPBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BIMS-2#PBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BIMS-2#TRPBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BIMS8-1#PBF	8-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BIMS8-1#TRPBF	8-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BIMS8-2#PBF	8-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252BIMS8-2#TRPBF	8-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252CCMS-1#PBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252CCMS-1#TRPBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252CCMS-2#PBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252CCMS-2#TRPBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252CIMS-1#PBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252CIMS-1#TRPBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252CIMS-2#PBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC4252CIMS-2#TRPBF	10-Lead MSOP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0130_Form Material_Report
LTC4252BCMS-1#PBF	PRODUCTION
LTC4252BCMS-1#TRPBF	PRODUCTION
LTC4252BCMS-2#PBF	PRODUCTION
LTC4252BCMS-2#TRPBF	PRODUCTION
LTC4252BIMS-1#PBF	PRODUCTION
LTC4252BIMS-1#TRPBF	PRODUCTION
LTC4252BIMS-2#PBF	PRODUCTION
LTC4252BIMS-2#TRPBF	PRODUCTION
LTC4252CCMS-1#PBF	PRODUCTION
LTC4252CCMS-1#TRPBF	PRODUCTION
LTC4252CCMS-2#PBF	PRODUCTION
LTC4252CCMS-2#TRPBF	PRODUCTION
LTC4252CIMS-1#PBF	PRODUCTION
LTC4252CIMS-1#TRPBF	PRODUCTION
LTC4252CIMS-2#PBF	PRODUCTION
LTC4252CIMS-2#TRPBF	PRODUCTION
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0128_Form Material_Report
LTC4252BCMS8-1#PBF	PRODUCTION
LTC4252BCMS8-1#TRPBF	PRODUCTION
LTC4252BCMS8-2#PBF	PRODUCTION
LTC4252BCMS8-2#TRPBF	PRODUCTION
LTC4252BIMS8-1#PBF	PRODUCTION
LTC4252BIMS8-1#TRPBF	PRODUCTION
LTC4252BIMS8-2#PBF	PRODUCTION
LTC4252BIMS8-2#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC4252CCMS-1#PBF	PRODUCTION
LTC4252CCMS-1#TRPBF	PRODUCTION
LTC4252CCMS-2#PBF	PRODUCTION
LTC4252CCMS-2#TRPBF	PRODUCTION
LTC4252CIMS-1#PBF	PRODUCTION
LTC4252CIMS-1#TRPBF	PRODUCTION
LTC4252CIMS-2#PBF	PRODUCTION
LTC4252CIMS-2#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice 1

LTC4252C-1 Demo Circuit - –48V/2.5A Hot Swap Controller

Models for the following parts are available in LTspice:

LTC4252C-1
LTC4252C-2

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.