LT4256-3

RECOMMENDED FOR NEW DESIGNS

Positive High Voltage Hot Swap Controller with Open-Circuit Detect

Part Models: 4
1ku List Price: Starting From $2.81

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Part Details

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

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 V_CC provides programmable undervoltage and overvoltage protection.

The LT4256-3 is available in a 16-lead SSOP package.


	Retry / Latch Off	Features	Package
LT4256-1	Latch Off	UV	SO-8
LT4256-2	Retry	UV	SO-8
LT4256-3	Latch Off or Retry	UV/OV, Open Circuit Detect	SSOP-16

Applications

Hot Board Insertion
Electronic Circuit Breaker/Power Bussing
Industrial High Side Switch/Circuit Breaker
24V/48V Industrial/Alarm Systems
Ideally Suited for 12V, 24V and 48V Distributed Power Systems
48V Telecom Systems

Part Models: 4
1ku List Price: Starting From $2.81

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
LT4256-3CGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT4256-3CGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT4256-3IGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT4256-3IGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking
		PCN24_0235_Form Material_Report Other Delta Qualification Matrix
LT4256-3CGN#PBF	PRODUCTION
LT4256-3CGN#TRPBF	PRODUCTION
LT4256-3IGN#PBF	PRODUCTION
LT4256-3IGN#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG]
		PCN22_0066_Form Material_Report Delta Qualification Matrix
LT4256-3CGN#PBF	PRODUCTION
LT4256-3CGN#TRPBF	PRODUCTION
LT4256-3IGN#PBF	PRODUCTION
LT4256-3IGN#TRPBF	PRODUCTION

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

Hardware Ecosystem

Parts	Product Life Cycle	Description
High Voltage Hot Swap Controllers 1
LTC4260	RECOMMENDED FOR NEW DESIGNS	Positive High Voltage Hot Swap Controller with I²C Compatible Monitoring

Tools & Simulations

LTspice 1

LT4256-3 - Hot Swap Controllers

Models for the following parts are available in LTspice:

LT4256-1
LT4256-2
LT4256-3

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.

Evaluation Kits

LT4256-3 Positive Voltage Hot Swap Controller

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Product Details

DC684A Demo Board for:
LT4256-3 Positive High Voltage Hot Swap Controller with Open-Circuit Detect
LT4254 -Positive High Voltage Hot Swap Controller with Open-Circuit Detect

Resources

DC684A - Design File
662.00K

DC684A - Schematic
30.00K

DC684A - Demo Manual
185.00K

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LT4256-3

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Product Selector Card 1