LTC4281 - Hot Swap Controller with I2C Compatible Monitoring
Features
- 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
Typical Application
Description
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.
Packaging
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 Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC4281CUFD#PBF | 4x5 QFN-28 | UFD | C | 05-08-1712 | Yes |
| LTC4281CUFD#TRPBF | 4x5 QFN-28 | UFD | C | 05-08-1712 | Yes |
| LTC4281IUFD#PBF | 4x5 QFN-28 | UFD | I | 05-08-1712 | Yes |
| LTC4281IUFD#TRPBF | 4x5 QFN-28 | UFD | I | 05-08-1712 | Yes |
Order Info
- 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
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC4281CUFD#PBF | 4x5 QFN-28 | C | $7.61 | $5.33 | Yes | |
| LTC4281CUFD#TRPBF | 4x5 QFN-28 | C | $7.67 | $5.39 | Yes | |
| LTC4281IUFD#PBF | 4x5 QFN-28 | I | $8.38 | $5.86 | Yes | |
| LTC4281IUFD#TRPBF | 4x5 QFN-28 | I | $8.44 | $5.92 | Yes | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear 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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| 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 | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1613A | USB-to-PMBus Controller for Use with LTpowerPlay | $50.00 | |
| Buy Now | |||
Applications
- Enterprise Servers and Data Storage Systems
- Network Routers and Switches
- Base Stations
- Platform Management
People Who Viewed This Product Also Viewed
- LT4363 - High Voltage Surge Stopper with Current Limit
- LTC4282 - High Current Hot Swap Controller with I2C Compatible Monitoring
- LTC4364 - Surge Stopper with Ideal Diode
- LTC4380 - Low Quiescent Current Surge Stopper
- LT8614 - 42V, 4A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current
- LTC2983 - Multi-Sensor High Accuracy Digital Temperature Measurement System
- LTC2946 - Wide Range I2C Power, Charge and Energy Monitor
- LT4356-1 and LT4356-2 - Surge Stopper
- LT8640/LT8640-1 - 42V, 5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current
- LT3042 - 20V, 200mA, Ultralow Noise, Ultrahigh PSRR RF Linear Regulator
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC4281
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
