LTC4244 - Rugged, CompactPCI Bus Hot Swap Controllers
Features
- Controls –12V, 3.3V, 5V and 12V Supplies
- ±14.4V Absolute Maximum Rating for 12VIN and –12VIN Input Pins
- Insensitive to Supply Voltage Transients
- Adjustable Foldback Current Limit with Circuit Breaker
- LOCAL_PCI_RST# Logic On-Chip
- PRECHARGE Output Biases I/O Pins During Card Insertion and Extraction
- LTC4244-1 Designed for Applications without –12V
- Available in 20-Lead Narrow SSOP Package
Typical Application
Description
The LTC®4244/LTC4244-1 are Hot Swap™ controllers that allow a board to be safely inserted into and removed from a CompactPCI™ bus slot. External N-channel transistors control the 5V and 3.3V supplies while on-chip switches control the ±12V supplies. The 3.3V and 5V supplies can be ramped up at an adjustable rate. Electronic circuit breakers protect all four supplies against overcurrent faults. After the power-up cycle is complete, the TIMER pin capacitor serves as auxiliary VCC allowing the LTC4244/ LTC4244-1 to function without interruption in the presence of voltage spikes on the 12VIN supply. The PWRGD output indicates when all four supplies are within tolerance. The OFF/ON pin is used to cycle board power or reset the circuit breaker. The PRECHARGE output can be used to bias the bus I/O pins during card insertion and extraction. PCI_RST# is combined on-chip with HEALTHY# in order to generate LOCAL_PCI_RST#.
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 |
|---|---|---|---|---|---|
| LTC4244CGN-1#PBF | SSOP-20 | GN | C | 05-08-1641 (GN20) | Yes |
| LTC4244CGN-1#TRPBF | SSOP-20 | GN | C | 05-08-1641 (GN20) | Yes |
| LTC4244CGN#PBF | SSOP-20 | GN | C | 05-08-1641 (GN20) | Yes |
| LTC4244CGN#TRPBF | SSOP-20 | GN | C | 05-08-1641 (GN20) | Yes |
| LTC4244IGN-1#PBF | SSOP-20 | GN | I | 05-08-1641 (GN20) | Yes |
| LTC4244IGN-1#TRPBF | SSOP-20 | GN | I | 05-08-1641 (GN20) | Yes |
| LTC4244IGN#PBF | SSOP-20 | GN | I | 05-08-1641 (GN20) | Yes |
| LTC4244IGN#TRPBF | SSOP-20 | GN | I | 05-08-1641 (GN20) | 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 | |
|---|---|---|---|---|---|---|
| LTC4244CGN-1#PBF | SSOP-20 | C | $5.54 | $3.90 | Yes | |
| LTC4244CGN-1#TRPBF | SSOP-20 | C | $4.00 | Yes | ||
| LTC4244CGN#PBF | SSOP-20 | C | $5.54 | $3.90 | Yes | |
| LTC4244CGN#TRPBF | SSOP-20 | C | $4.00 | Yes | ||
| LTC4244IGN-1#PBF | SSOP-20 | I | $6.25 | $4.45 | Yes | |
| LTC4244IGN-1#TRPBF | SSOP-20 | I | $4.55 | Yes | ||
| LTC4244IGN#PBF | SSOP-20 | I | $6.25 | $4.45 | Yes | |
| LTC4244IGN#TRPBF | SSOP-20 | I | $4.55 | 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.Click here to view our complete list of demo boards
Applications
- Hot Board Insertion into CompactPCI Bus
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Design Tools
Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:
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- Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
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- And More!
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.
