LT4250

RECOMMENDED FOR NEW DESIGNS

Negative 48V Hot Swap Controller

Part Models: 12
1ku List Price: Starting From $2.71

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Overview

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 Compatible ON/OFF Threshold

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. The PWRGD (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 packages

Applications

Central Office Switching
–48V Distributed Power Systems
Negative Power Supply Control

Part Models: 12
1ku List Price: Starting From $2.71

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
LT4250HCN8#PBF	8-Lead PDIP (Narrow 0.3 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4250HCS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4250HCS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4250HIN8#PBF	8-Lead PDIP (Narrow 0.3 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4250HIS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4250HIS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4250LCN8#PBF	8-Lead PDIP (Narrow 0.3 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4250LCS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4250LCS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4250LIN8#PBF	8-Lead PDIP (Narrow 0.3 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4250LIS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4250LIS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 8, 2024 - 24_0234 Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package
		PCN24_0234_Form Material_Report Marking Comparison
LT4250HCN8#PBF	PRODUCTION
LT4250HIN8#PBF	PRODUCTION
LT4250LCN8#PBF	PRODUCTION
LT4250LIN8#PBF	PRODUCTION
Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package
		PCN22_0241_Form Material_Report Qualification Results Summary
LT4250HCN8#PBF	PRODUCTION
LT4250HIN8#PBF	PRODUCTION
LT4250LCN8#PBF	PRODUCTION
LT4250LIN8#PBF	PRODUCTION
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]
		PCN22_0172_Form Material_Report Delta Qualification Matrix
LT4250HCN8#PBF	PRODUCTION
LT4250HIN8#PBF	PRODUCTION
LT4250LCN8#PBF	PRODUCTION
LT4250LIN8#PBF	PRODUCTION
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package
		PCN24_0246_Form Material_Report Marking Comparison Delta Qualification Matrix
LT4250HCS8#PBF	PRODUCTION
LT4250HCS8#TRPBF	PRODUCTION
LT4250HIS8#PBF	PRODUCTION
LT4250HIS8#TRPBF	PRODUCTION
LT4250LCS8#PBF	PRODUCTION
LT4250LCS8#TRPBF	PRODUCTION
LT4250LIS8#PBF	PRODUCTION
LT4250LIS8#TRPBF	PRODUCTION
Oct 12, 2022 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)
		PCN22_0255_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT4250HCS8#PBF	PRODUCTION
LT4250HCS8#TRPBF	PRODUCTION
LT4250HIS8#PBF	PRODUCTION
LT4250HIS8#TRPBF	PRODUCTION
LT4250LCS8#PBF	PRODUCTION
LT4250LCS8#TRPBF	PRODUCTION
LT4250LIS8#PBF	PRODUCTION
LT4250LIS8#TRPBF	PRODUCTION
Jun 16, 2021 - 21_0026 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
		PCN21_0026_Form Material_Report Delta Qualification Matrix
LT4250HCS8#PBF	PRODUCTION
LT4250HCS8#TRPBF	PRODUCTION
LT4250HIS8#PBF	PRODUCTION
LT4250HIS8#TRPBF	PRODUCTION
LT4250LCS8#PBF	PRODUCTION
LT4250LCS8#TRPBF	PRODUCTION
LT4250LIS8#PBF	PRODUCTION
LT4250LIS8#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 2
LTC4252 LTC4252A		Negative Voltage Hot Swap Controllers
LTC4251	RECOMMENDED FOR NEW DESIGNS	Negative Voltage Hot Swap Controllers in SOT-23

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT4250H
LT4250L

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.