Overview
Features and Benefits
- Allows Safe Board Insertion Into Live Backplane
- 12-/16-Bit ADC with ±0.7% Total Unadjusted Error
- Monitors Current, Voltage, Power and Energy
- 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
- Reboots on I2C Command
- Input Overvoltage and Undervoltage Protection
- Three General Purpose Input/Outputs
- Internal ±5% or External Timebases
- 28-Pin 4mm × 5mm QFN Package
- AEC-Q100 Qualified for Automotive Applications
Product Details
The LTC4281 Hot Swap controller allows a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, 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 to limit the MOSFET power to a constant value. A wide input voltage operating range comfortably allows applications from 2.9V to 33V.
The LTC4281 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.
Applications
- Enterprise Servers and Data Storage Systems
- Network Routers and Switches
- Base Stations
- Platform Management
Product Categories
Markets and Technologies
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (3)
Documentation & Resources
-
R547 Reliability Data3/26/2018PDF146 K
-
DC2578A - Demo Board Manual1/18/2018PDF2M
-
DC2278A - Demo Manual9/23/2016PDF1M
-
High Power Hot Swap Controllers7/30/2020PDF1 M
-
Hot Swap Controllers7/13/2017PDF778 K
Tools & Simulations
LTspice
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.
Models for the following parts are available in LTspice:
LTC4281
Reference Designs (1)
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC4281AUFD#PBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LTC4281AUFD#TRPBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LTC4281CUFD#PBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LTC4281CUFD#TRPBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LTC4281IUFD#PBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LTC4281IUFD#TRPBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LTC4281IUFD#WPBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LTC4281IUFD#WTRPBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R547 Reliability Data |
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Sample & Buy
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.