LT4256-1 LT4256-2

Name: LT4256-1
Brand: Analog Devices
Price: 2.96 USD
Availability: InStock

PRODUCTION

Positive High Voltage Hot Swap Controllers

Data Sheet Product Selection Table

Part Models: 8
1ku List Price: Starting From $2.96

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Overview

Allows Safe Board Insertion and Removal from a Live Backplane
Controls Supply Voltage from 10.8V to 80V
Foldback Current Limiting
Overcurrent Fault Detection
Drives an External N-Channel MOSFET

Programmable Supply Voltage Power-Up Rate
Undervoltage Protection
Latch Off Operation Mode (LT4256-1)
Automatic Retry (LT4256-2)
Available in an 8-Pin SO Package

The LT4256-1/LT4256-2 are high voltage Hot Swap^™ controllers that allow a board to be safely inserted and removed from a live backplane. An internal driver drives an external N-channel MOSFET switch to control supply voltages ranging from 10.8V to 80V.

The LT4256-1/LT4256-2 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 and the PWRGD output asserts low. The LT4256-2 automatically restarts after a time-out delay. The LT4256-1 latches off until the UV pin is cycled low.

The PWRGD output indicates when the output voltage rises above a programmed level. An external resistor string from V_CC provides programmable undervoltage protection.

The LT4256 can be used as an upgrade to LT1641 designs.

The LT4256-1 and LT4256-2 are available in an 8-pin SO package that is pin compatible with the LT1641.


	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: 8
1ku List Price: Starting From $2.96

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
LT4256-1CS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT4256-1CS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT4256-1IS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT4256-1IS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT4256-2CS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT4256-2CS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT4256-2IS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT4256-2IS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

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
LT4256-1CS8#PBF	PRODUCTION
LT4256-1CS8#TRPBF	PRODUCTION
LT4256-1IS8#PBF	PRODUCTION
LT4256-1IS8#TRPBF	PRODUCTION
LT4256-2CS8#PBF	PRODUCTION
LT4256-2CS8#TRPBF	PRODUCTION
LT4256-2IS8#PBF	PRODUCTION
LT4256-2IS8#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
LT4256-1CS8#PBF	PRODUCTION
LT4256-1CS8#TRPBF	PRODUCTION
LT4256-1IS8#PBF	PRODUCTION
LT4256-1IS8#TRPBF	PRODUCTION
LT4256-2CS8#PBF	PRODUCTION
LT4256-2CS8#TRPBF	PRODUCTION
LT4256-2IS8#PBF	PRODUCTION
LT4256-2IS8#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
Hot Swap Controllers 1
LTC4260	RECOMMENDED FOR NEW DESIGNS	Positive High Voltage Hot Swap Controller with I²C Compatible Monitoring

Tools & Simulations

LTspice 2

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

LT4256-1 Positive High Voltage Hot Swap Controllers with Latch-off (-1)

Buy Now View Details

Product Details

DC1354A-A: Demo Board for the LT4256-1 Positive High Voltage Hot Swap Controllers

Resources

DC1354A - Schematic
9/24/2009

DC1354A - Design File
9/24/2009

DC1354A - Demo Manual
9/24/2009

LT4256-2 Positive High Voltage Hot Swap Controllers with Auto-Retry(-2)

Buy Now View Details

Product Details

DC1354A-B: Demo Board for the LT4256-2 Positive High Voltage Hot Swap Controllers

Resources

DC1354A - Schematic
9/24/2009

DC1354A - Design File
9/24/2009

DC1354A - Demo Manual
9/24/2009

LT1641-1, LT1641-2, LT4256-1, and LT4256-2 Positive High Voltage Hot Swap Controller

Buy Now View Details

Product Details

Demonstration circuit 1354B is a positive high voltage hot swap controller featuring either the LT^®1641-1, LT1641-2, LT4256-1, or LT4256-2.

The board facilitates measurement of transient conditions, steady state operation with different loads, and fault conditions. The Controller responds to fault conditions such as input undervoltage(UV), output power good (PWRGD) fault, and overcurrent and response can be verified by the output voltage (V_OUT) LED state and PWRGD pin signal. The LT1641-1 and LT4256-1 latch off if MOSFET shuts off under overcurrent condition, while LT1641-2 and LT4256-2 automatically restart after time-out delay.

The DC1354B contains one hot swap controller, power MOSFET, current sense resistor, enable circuit, input voltage clamp, gate protection circuit, resistive output voltage divider for feedback signal, and three LEDs to indicate the presence of input and output voltages and power good condition.

Resources

DC1354B - Demo Manual
3/13/2019

DC1354B - Schematic
3/13/2019

DC1354B - Design Files
3/13/2019

2-port 10BASE-T1L Arduino Shield with SPoE Power Forwarding

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Features and Benefits

Software-controlled Power and Data forwarding
Power isolation
Multiple SPoE classes
Complete connectivity passthrough
Compatible with Arduino Mega form-factor
Supports daisy chaining with other compatible boards

Product Details

The AD-APARDPFW-SL is a 10BASE-T1L power forwarder with Single Pair Power over Ethernet (SPoE) for development of field devices and applications on an AD-APARD32690-SL platform board. The SPoE powered device (PD) and isolated flyback regulator provide 12V power to the platform board. SPoE Class 10 to 12 (24V nominal) and Class 13 to 14 (55V nominal) are supported.

Designed for use on the AD-APARD32690-SL platform, the AD-APARDPFW-SL hardware features Arduino Mega Form-factor headers, and two 10BASE-T1L ports for connecting to a 10BASE-T1L Power Sourcing Equipment (PSE) such as the AD-RPI-T1LPSE-SL 2-port 10BASE-T1L with SPoE PSE Development Platform.

To allow board stacking and development of field device applications using Arduino shields, the AD-APARDPFWD-SL has extra tall headers that allow other Arduino shields to be stacked on top of it.

The design also features complete power and data isolation to the host AD-APARD32690-SL.

APPLICATIONS