LTC4223 - Dual Supply Hot Swap Controller for Advanced Mezzanine Card


  • Allows Safe Insertion into Live AMC or MicroTCA Backplane
  • Controls 12V Main and 3.3V Auxiliary Supplies
  • Limits Peak Fault Current in ≤1µs
  • Adjustable Current Limit with Circuit Breaker
  • Integrated 0.3Ω AUX Switch
  • High Side Current Sense
  • Gate Drive for External N-Channel MOSFET
  • Adjustable Response Time for Overcurrent Protection
  • Adjustable Supply Voltage Power-Up Rate
  • Thermal Shutdown Protection
  • LTC4223-1: Latch Off After Fault
  • LTC4223-2: Automatic Retry After Fault
  • 16-Lead SSOP and 5mm x 4mm DFN Packages

Typical Application

LTC4223 Typical Application
LTC4223 Typical Application


The LTC4223 positive voltage Hot Swap controller allows a board to be safely inserted and removed from a live AMC or MicroTCA backplane. It controls the main 12V supply with an external N-channel MOSFET and the 3.3V auxiliary supply with an integrated switch. The 12V output ramp rate is adjustable and includes inrush current limiting. The 12V output is also protected against short circuit faults with a fast acting current limit and a 5% accurate timed circuit breaker. The 3.3V output includes both soft start and overcurrent protection.

The LTC4223 features a current monitor output for the 12V supply, and reports fault and power-good status for both supplies. It also detects card presence and allows independent control of the 12V and auxiliary 3.3V supply outputs. The LTC4223-1 features a latch-off circuit breaker, while the LTC4223-2 provides automatic retry after a fault.


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
LTC4223CDHD-1#PBF 5x4 DFN-16 DHD C 05-08-1707 Yes
LTC4223CDHD-1#TRPBF 5x4 DFN-16 DHD C 05-08-1707 Yes
LTC4223CDHD-2#PBF 5x4 DFN-16 DHD C 05-08-1707 Yes
LTC4223CDHD-2#TRPBF 5x4 DFN-16 DHD C 05-08-1707 Yes
LTC4223CGN-1#PBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC4223CGN-1#TRPBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC4223CGN-2#PBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC4223CGN-2#TRPBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC4223IDHD-1#PBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LTC4223IDHD-1#TRPBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LTC4223IDHD-2#PBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LTC4223IDHD-2#TRPBF 5x4 DFN-16 DHD I 05-08-1707 Yes
LTC4223IGN-1#PBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LTC4223IGN-1#TRPBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LTC4223IGN-2#PBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LTC4223IGN-2#TRPBF SSOP-16 GN I 05-08-1641 (GN16) Yes

LTC4223 Package Drawing
LTC4223 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
LTC4223CDHD-1#PBF 5x4 DFN-16 C $2.79 $1.95 Yes
LTC4223CDHD-1#TRPBF 5x4 DFN-16 C $2.01 Yes
LTC4223CDHD-2#PBF 5x4 DFN-16 C $2.79 $1.95 Yes
LTC4223CDHD-2#TRPBF 5x4 DFN-16 C $2.01 Yes
LTC4223CGN-1#PBF SSOP-16 C $2.79 $1.95 Yes
LTC4223CGN-1#TRPBF SSOP-16 C $2.01 Yes
LTC4223CGN-2#PBF SSOP-16 C $2.79 $1.95 Yes
LTC4223CGN-2#TRPBF SSOP-16 C $2.01 Yes
LTC4223IDHD-1#PBF 5x4 DFN-16 I $3.34 $2.34 Yes
LTC4223IDHD-1#TRPBF 5x4 DFN-16 I $2.40 Yes
LTC4223IDHD-2#PBF 5x4 DFN-16 I $3.34 $2.35 Yes
LTC4223IDHD-2#TRPBF 5x4 DFN-16 I $2.40 Yes
LTC4223IGN-1#PBF SSOP-16 I $3.34 $2.34 Yes
LTC4223IGN-1#TRPBF SSOP-16 I $2.40 Yes
LTC4223IGN-2#PBF SSOP-16 I $3.34 $2.34 Yes
LTC4223IGN-2#TRPBF SSOP-16 I $2.40 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.

Part Number Description Price Documentation
DC1162A-A LTC4223-1 Dual Supply Hotswap Controller for AMC (Latch Off After Fault) $75.00
DC1162A-B LTC4223-2 Dual Supply Hotswap Controller for AMC (Automatic Retry After Fault ) $75.00
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