LTC4282 - High Current Hot Swap Controller with I2C Compatible Monitoring

The LTC4282 Hot SwapTM controller allows a board to be safely inserted and removed from a live backplane. Using one or more external N-channel pass transistors, board supply voltage and inrush current are ramped up at an adjustable rate. An I2C interface and onboard ADC allows for monitoring of board current, voltage, power, energy and fault status.

The device features analog foldback current limiting and supply monitoring for applications from 2.9V to 33V. Dual 12V gate drive allows high power applications to either share safe operating area across parallel MOSFETs or support a 2-stage start-up that first charges the load capacitance followed by enabling a low on-resistance path to the load.

The LTC4282 is well suited to high power applications because the precise monitoring capability and accurate current limiting reduce the extremes in which both loads and power supplies must safely operate. Non-volatile configuration allows for flexibility in the autonomous generation of alerts and response to faults.

Features

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Allows Safe Board Insertion Into Live Backplane
12-/16-Bit ADC with ±0.7% Total Unadjusted Error
Monitors Current, Voltage, Power and Energy
Controls Two Parallel N-Channel MOSFETs for High Current Applications
Internal EEPROM for Nonvolatile Configuration
Wide Operating Voltage Range: 2.9V to 33V
I2C/SMBus Digital Interface (Coexists with PMBus Devices)
12V Gate Drive for Lower MOSFET RDS(ON)
Programmable Current Limit with 2% Accuracy
MOSFET Power Limiting with Current Foldback
Continuously Monitors MOSFET Health
Stores Minimum and Maximum Measurements
Alerts When Alarm Thresholds Exceeded
Input Overvoltage/Undervoltage Protection
Three General Purpose Input/Outputs
Internal ±5% or External Timebases
32-Pin 5mm × 5mm QFN Package

Typical Application

Applications

Enterprise Servers and Data Storage Systems
Network Routers and Switches
Base Stations
Platform Management

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC4282CUH#PBF	5x5 QFN-32	C	$8.50	$5.95
LTC4282CUH#TRPBF	5x5 QFN-32	C	$8.56	$6.01
LTC4282IUH#PBF	5x5 QFN-32	I	$9.35	$6.55
LTC4282IUH#TRPBF	5x5 QFN-32	I	$9.41	$6.61

Demo Boards

Part Number	Description	Price
DC2024A-A	LTC4282 Demo Board \| 100A Hot Swap Controller with Telemetry [requires DC1613]	$125.00

Companion Boards

Part Number	Description	Price
DC1613A	USB-to-PMBus Controller for Use with LTpowerPlay	$50.00
DC2026C	Linduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform	$75.00