LTC4245

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Multiple Supply Hot Swap Controller with I²C Compatible Monitoring

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Overview

Allows Safe Insertion into Live CompactPCI^™ or PCI Express^™ Backplane
8-Bit ADC Monitors Current and Voltage
I²C^™/SMBus Interface
dI/dt Controlled Soft Start
Simultaneous or Sequenced Turn-On
±20V Absolute Maximum Rating for ±12V Supplies
No External Gate Capacitor Required
Dual-Level Circuit Breaker and Current Limit
Bus Precharge Output
Power Good Input with Timeout
Optional Latch-off or Autoretry After Faults
Alerts Host After Faults
Integrated LOCAL_PCI_RST# Logic
36-Pin SSOP and 38-Pin (5mm × 7mm) QFN Packages

The LTC4245 Hot Swap^™ controller allows a board to be safely inserted and removed from a live backplane in multiple supply systems such as CompactPCI and PCI Express. Using four external N-channel pass transistors, the board supply voltages can be ramped up at an adjustable rate and in any desired sequence. An I²C interface and on-board ADC allow monitoring of board current, voltage and fault status for each supply.

The device features adjustable dI/dt controlled soft start and foldback limited inrush current. A dual-level timed circuit breaker and fast current limit protect each supply against overcurrent faults. A power good input with timeout allows a downstream supply monitor to disconnect the board supplies. The device can be conﬁgured to function without a –12V supply or with an extra 3.3V supply instead of a 5V supply.

The controller has additional features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a load card and power-up in either the on or off state.

Applications

Live Board Insertion
CompactPCI, CompactPCI Express, CompactTCA, PCI Express Systems

Documentation

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 3
LTC4222	PRODUCTION	Dual Hot Swap Controller with I²C Compatible Monitoring
LTC4240	PRODUCTION	CompactPCI Hot Swap Controller with I²C Compatible Interface
LTC4242	RECOMMENDED FOR NEW DESIGNS	Dual Slot Hot Swap Controller for PCI Express

Tools & Simulations

Linduino 3

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.

Purchase Linduino

Evaluation Kits

LTC4245 Demoboard: Quad Hot Swap Controller with ADC and I2C (Requires DC590)

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Product Details

DC985A-A/B: Demo Board for the LTC4245 Multiple Supply Hot Swap Controller with I²C Compatible Monitoring.

Resources

DC985A - Demo Manual
9/24/2009

DC985A - Design File
9/24/2009

DC985A - 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