LTC4244 - Rugged, CompactPCI Bus Hot Swap Controllers


  • 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

LTC4244 Typical Application


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#.


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
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

LTC4244 Package Drawing

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
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
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

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


  • Hot Board Insertion into CompactPCI Bus

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