LTC4281 - Hot Swap Controller with I2C Compatible Monitoring
- Order Custom Programmed Parts
- 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/Undervoltage Protection
- Three General Purpose Input/Outputs
- Internal ±5% or External Timebases
- 28-Pin 4mm × 5mm QFN Package
The LTC®4281 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.
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
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Demo BoardsLinear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
|DC2278A-A||LTC4281 Demo Board | 12V, 50A Hot Swap Controller with Telemetry [requires DC1613]||$100.00|
|DC2278A-B||LTC4281 Demo Board with Programming Socket | 12V, 50A Hot Swap Controller with Telemetry [requires DC1613]||$150.00|
|DC1613A||USB-to-PMBus Controller for Use with LTpowerPlay||$50.00|
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- Network Routers and Switches
- Base Stations
- Platform Management
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