LTC4215-1 and -3 - Hot Swap Controller with I2C Compatible Monitoring
Features
- Allows Safe Insertion into Live Backplane
- 8-Bit ADC Monitors Current and Voltage
- I2C/SMBus Interface
- Wide Operating Voltage Range: 2.9V to 15V
- dI/dt Controlled Soft-Start
- Circuit Breaker Timeout: 20μs (LTC4215-1) or 420μs (LTC4215-3)
- Three General Purpose Outputs
- High Side Drive for External N-channel MOSFET
- No External Gate Capacitor Required
- Input Overvoltage/Undervoltage Protection
- Optional Latchoff or Auto-Retry After Faults
- Alerts Host After Faults
- Inrush Current Limit with Foldback
- Available in 24-Pin (4mm × 5mm) QFN
Typical Application
Description
The LTC4215-1/LTC4215-3 Hot Swap™ controllers allow 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 allow for monitoring of load current, voltage and fault status.
The device features adjustable foldback current limit and a soft-start pin that sets the dI/dt of the inrush current. An I2C interface may configure the part to latch off or automatically restart after the LTC4215-1/LTC4215-3 detect a current limit fault.
The controller has additional features to interrupt the host when a fault has occurred, provide three general purpose outputs, notify when output power is good, detect insertion of a load card, and power-up either automatically upon insertion or wait for an I2C command to turn on.
The LTC4215-1 has a 20μs circuit breaker filter for applications that require a fast fault response time. The LTC4215-3 has an extended 420μs circuit breaker filter for applications where supply transients may exceed 20μs.
| Circuit Breaker Timeout |
General Purpose Outputs |
|
| LTC4215 | 20us | 1 |
| LTC4215-1 | 20us | 3 |
| LTC4215-2 | 420us | 1 |
| LTC4215-3 | 420us | 3 |
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 |
|---|---|---|---|---|---|
| LTC4215CUFD-1#PBF | 4x5 QFN-24 | UFD | C | 05-08-1696 | Yes |
| LTC4215CUFD-1#TRPBF | 4x5 QFN-24 | UFD | C | 05-08-1696 | Yes |
| LTC4215CUFD-3#PBF | 4x5 QFN-24 | UFD | C | 05-08-1696 | Yes |
| LTC4215CUFD-3#TRPBF | 4x5 QFN-24 | UFD | C | 05-08-1696 | Yes |
| LTC4215IUFD-1#PBF | 4x5 QFN-24 | UFD | I | 05-08-1696 | Yes |
| LTC4215IUFD-1#TRPBF | 4x5 QFN-24 | UFD | I | 05-08-1696 | Yes |
| LTC4215IUFD-3#PBF | 4x5 QFN-24 | UFD | I | 05-08-1696 | Yes |
| LTC4215IUFD-3#TRPBF | 4x5 QFN-24 | UFD | I | 05-08-1696 | 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 | |
|---|---|---|---|---|---|---|
| LTC4215CUFD-1#PBF | 4x5 QFN-24 | C | $5.78 | $3.95 | Yes | |
| LTC4215CUFD-1#TRPBF | 4x5 QFN-24 | C | $4.01 | Yes | ||
| LTC4215CUFD-3#PBF | 4x5 QFN-24 | C | $5.78 | $3.95 | Yes | |
| LTC4215CUFD-3#TRPBF | 4x5 QFN-24 | C | $4.01 | Yes | ||
| LTC4215IUFD-1#PBF | 4x5 QFN-24 | I | $6.94 | $4.74 | Yes | |
| LTC4215IUFD-1#TRPBF | 4x5 QFN-24 | I | $4.80 | Yes | ||
| LTC4215IUFD-3#PBF | 4x5 QFN-24 | I | $6.94 | $4.74 | Yes | |
| LTC4215IUFD-3#TRPBF | 4x5 QFN-24 | I | $4.80 | 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 |
|---|---|---|---|
| DC1243A | LTC4215-1 Hot Swap Controller with ADC and 3 GPIO (req DC590) | $100.00 | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC590B | Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards | $50.00 | |
| Buy Now | |||
Applications
- Live Board Insertion
- Electronic Circuit Breakers
- Computers, Servers
- Platform Management
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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:
LTC4215
LTC4215-1
LTC4215-2
LTC4215-3
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.
