LTC4240 - CompactPCI Hot Swap Controller with I²C Compatible Interface
Features
- Allows Safe Board Insertion and Removal from a Live CompactPCI™ Bus
- I²C™ Compatible 2-Wire Interface
- PRECHARGE Output Biases I/O Pins During Card Insertion and Extraction
- Controls 3.3V, 5V, 12V and –12V Supplies
- Foldback Current Limit with Circuit Breaker
- LOCAL_PCI_RST# Logic On-Board
- QuickSwitch® Enable Output
- Status LED Driver
- User Programmable Supply Voltage Power-Up Rate
- Registers Individual Supply Faults
- Available in a 28-Pin Narrow SSOP Package
Typical Application
Description
The LTC4240 is a Hot Swap controller that allows a board to be safely inserted and removed from a live CompactPCI bus slot. The LTC4240 has a built-in 2-wire I²C compatible interface to allow software control and monitoring of device function and power supply status. Two external N-channel transistors control the 3.3V and 5V supplies, while two internal switches control the –12V and 12V supplies. Electronic circuit breakers protect all four supplies against overcurrent faults. The PWRGD output indicates when all of the supply voltages are within tolerance. The OFF/ON pin is used to cycle the board power or reset the circuit breaker. The I²C interface allows the user to turn the device off or on, set RESETOUT, turn on the status LED driver and ignore 12V, –12V faults. It also allows the user to read the status of the FAULT, RESETIN, RESETOUT, PWRGD, PRSNT1# and PRSNT2# pins. Under a fault condition, the I²C interface can also be used to determine which of the four supplies generated the fault. The LTC4240 is available in a 28-pin narrow SSOP package.
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 |
|---|---|---|---|---|---|
| LTC4240CGN#PBF | SSOP-28 | GN | C | 05-08-1641 (GN28) | Yes |
| LTC4240CGN#TRPBF | SSOP-28 | GN | C | 05-08-1641 (GN28) | Yes |
| LTC4240IGN#PBF | SSOP-28 | GN | I | 05-08-1641 (GN28) | Yes |
| LTC4240IGN#TRPBF | SSOP-28 | GN | I | 05-08-1641 (GN28) | 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 | |
|---|---|---|---|---|---|---|
| LTC4240CGN#PBF | SSOP-28 | C | $5.25 | $4.25 | Yes | |
| LTC4240CGN#TRPBF | SSOP-28 | C | $4.65 | Yes | ||
| LTC4240IGN#PBF | SSOP-28 | I | $6.00 | $4.90 | Yes | |
| LTC4240IGN#TRPBF | SSOP-28 | I | $5.00 | 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 |
|---|---|---|---|
| DC458A | LTC4240CGN | I2C Compact PCI Hot Swap Controller | $100.00 | |
| Buy Now | |||
Applications
- Hot Board Insertion into CompactPCI Bus
- Electronic Circuit Breaker
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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:
LTC4240
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.
