LTC4241 - PCI-Bus with 3.3V Auxiliary Hot Swap Controller


  • Allows Safe Board Insertion and Removal from a Live PCI Slot
  • Controls 3.3V, 5V, –12V, 12V and 3.3V Auxiliary Supplies
  • Independent 3.3V Auxiliary Supply Hot Swap™ Controller
  • Adjustable Foldback Current Limit with Circuit Breaker
  • Adjustable Supply Voltage Power-Up Rate
  • High Side Drive for External N-Channel FETs
  • –12V and 12V On-Chip Switches
  • Fault and Power Good Outputs

Typical Application

LTC4241 Typical Application


The LTC®4241 is a Hot Swap controller that allows a board to be safely inserted and removed from a live PCI-bus slot. It has a primary controller that controls the four PCI supplies and an independent auxiliary controller to controlthe 3.3V auxiliary supply. External N-channel transistors are used to control the 3.3V, 5V and 3.3V auxiliary supplies while on-chip switches control the –12V and 12V supplies. The 3.3V, 5V and 3.3V auxiliary supplies can be ramped upat an adjustable rate. Electronic circuit breakers protect all five supplies against overcurrent faults. The foldback current limit feature reduces current spikes and power dissipation when shorts occur. The PWRGD output of the primary controller indicates when all four PCI supplies are within tolerance. The FAULT output indicates an overcurrent condition for any of the five supplies.

The LTC4241 is available in the 20-pin narrow SSOP package.


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
LTC4241CGN#PBF SSOP-20 GN C 05-08-1641 (GN20) Yes
LTC4241CGN#TRPBF SSOP-20 GN C 05-08-1641 (GN20) Yes
LTC4241IGN#PBF SSOP-20 GN I 05-08-1641 (GN20) Yes
LTC4241IGN#TRPBF SSOP-20 GN I 05-08-1641 (GN20) Yes

LTC4241 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
LTC4241CGN#PBF SSOP-20 C $2.15 $1.75 Yes
LTC4241CGN#TRPBF SSOP-20 C $1.81 Yes
LTC4241IGN#PBF SSOP-20 I $2.55 $2.05 Yes
LTC4241IGN#TRPBF SSOP-20 I $2.11 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.

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