LTC4261

PRODUCTION

Negative Voltage Hot Swap Controllers with ADC and I²C Monitoring

Part Models: 16
1ku List Price: Starting From $6.43

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Overview

Allows Safe Insertion into Live –48V Backplanes
10-Bit ADC Monitors Current and Voltages
I²C/SMBus Interface or Single-Wire Broadcast Mode
Floating Topology Allows Very High Voltage Operation
Independently Adjustable Inrush and Overcurrent Limits
Controlled Soft-Start Inrush
Adjustable UV/OV Thresholds and Hysteresis
Sequenced Power Good Outputs with Delays
Adjustable Power Good Input Timeout
Programmable Latchoff or Auto-Retry After Faults
Alerts Host After Faults
Available in 28-Lead Narrow SSOP and 24-Lead (4mm × 5mm) QFN Packages

The LTC4261/LTC4261-2 negative voltage Hot Swap^™ controllers allow a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, the board supply voltage can be ramped at an adjustable rate. The devices feature independently adjustable inrush current and overcurrent limits to minimize stresses on the pass transistor during start-up, input step and output short conditions. The LTC4261 defaults to latch-off while the LTC4261-2 defaults to auto-retry on overcurrent faults.

An I²C interface and onboard 10-bit ADC allow monitoring of board current, voltage and fault status. A single-wire broadcast mode is available to simplify the interface by eliminating two optoisolators.

The controllers have additional features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a board and turn off the pass transistor if an external supply monitor fails to indicate power good within a timeout period.

Applications

AdvancedTCA Systems
Telecom Infrastructure
–48V Distributed Power Systems
Power Monitors

Part Models: 16
1ku List Price: Starting From $6.43

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
LTC4261CGN#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261CGN#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261CGN-2#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261CGN-2#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261CUFD#PBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261CUFD#TRPBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261CUFD-2#PBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261CUFD-2#TRPBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261IGN#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261IGN#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261IGN-2#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261IGN-2#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261IUFD#PBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261IUFD#TRPBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261IUFD-2#PBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4261IUFD-2#TRPBF	24-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL
		PCN22_0177_Form Material_Report Delta Qualification Matrix
LTC4261CGN#PBF	PRODUCTION
LTC4261CGN#TRPBF	PRODUCTION
LTC4261CGN-2#PBF	PRODUCTION
LTC4261CGN-2#TRPBF	PRODUCTION
LTC4261IGN#PBF	PRODUCTION
LTC4261IGN#TRPBF	PRODUCTION
LTC4261IGN-2#PBF	PRODUCTION
LTC4261IGN-2#TRPBF	PRODUCTION
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
LTC4261CGN-2#PBF	PRODUCTION
LTC4261CGN-2#TRPBF	PRODUCTION
LTC4261IGN-2#PBF	PRODUCTION
LTC4261IGN-2#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
LTM9100	PRODUCTION	Anyside^™ High Voltage Isolated Switch Controller with I²C Command and Telemetry
LTC4371	RECOMMENDED FOR NEW DESIGNS	Dual Negative Voltage Ideal Diode-OR Controller and Monitor

Tools & Simulations

LTspice 1

LTC4261 Demo Circuit - -48V/200W Hot Swap Controller with I2C and ADC

Models for the following parts are available in LTspice:

LTC4261

Linduino 3

LTpowerPlay®

LTpowerPlay® is a powerful, Windows-based development environment supporting Linear Technology's Digital Power System Management (PSM) products.

Open Tool

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.

Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.

Linduino code repository on GitHub and instructions on how to use the code.

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Evaluation Kits

LTC4261 –48V Hot Swap w/ADC (Requires DC590)

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Product Details

DC998A - Demo Board for the LTC4261 Negative Voltage Hot Swap Controllers with ADC and I²C Monitoring.

Resources

DC998A - Design File
9/24/2009

DC998A - Demo Manual
9/24/2009

DC998A - Schematic
9/24/2009

Reference Designs

View Detailed Reference Design

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications