LTC4218 - Hot Swap Controller


  • Wide Operating Voltage Range: 2.9V to 26.5V
  • Adjustable, 5% Accurate 15mV Current Limit
  • Current Monitor Output
  • Adjustable Current Limit Timer Before Fault
  • Power Good and Fault Outputs
  • Adjustable Inrush Current Control
  • 2% Accurate Undervoltage and Overvoltage Protection
  • Available in 16-Lead SSOP and 16-Pin 5mm × 3mm DFN Packages

Typical Application

LTC4218 Typical Application
LTC4218 Typical Application


The LTC®4218 is a Hot Swap™ controller that allows a board to be safely inserted and removed from a live backplane. An internal high side switch driver controls the gate of an external N-channel MOSFET for supply voltages from 2.9V to 26.5V. A dedicated 12V version (LTC4218-12) contains preset 12V specific thresholds, while the standard LTC4218 allows adjustable thresholds.

The LTC4218 provides an accurate (5%) current limit with current foldback limiting. The current limit threshold can be adjusted dynamically using an external pin. Additional features include a current monitor output that amplifies the sense voltage for ground referenced current sensing. Overvoltage, undervoltage and power good monitoring are also provided.


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
LTC4218CDHC-12#PBF 5x3 DFN-16 DHC C 05-08-1706 Yes
LTC4218CDHC-12#TRPBF 5x3 DFN-16 DHC C 05-08-1706 Yes
LTC4218CGN#PBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC4218CGN#TRPBF SSOP-16 GN C 05-08-1641 (GN16) Yes
LTC4218IDHC-12#PBF 5x3 DFN-16 DHC I 05-08-1706 Yes
LTC4218IDHC-12#TRPBF 5x3 DFN-16 DHC I 05-08-1706 Yes
LTC4218IGN#PBF SSOP-16 GN I 05-08-1641 (GN16) Yes
LTC4218IGN#TRPBF SSOP-16 GN I 05-08-1641 (GN16) Yes

LTC4218 Package Drawing
LTC4218 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
LTC4218CDHC-12#PBF 5x3 DFN-16 C $3.79 $2.65 Yes
LTC4218CDHC-12#TRPBF 5x3 DFN-16 C $2.71 Yes
LTC4218CGN#PBF SSOP-16 C $3.79 $2.65 Yes
LTC4218CGN#TRPBF SSOP-16 C $2.71 Yes
LTC4218IDHC-12#PBF 5x3 DFN-16 I $4.35 $3.05 Yes
LTC4218IDHC-12#TRPBF 5x3 DFN-16 I $3.11 Yes
LTC4218IGN#PBF SSOP-16 I $4.35 $3.05 Yes
LTC4218IGN#TRPBF SSOP-16 I $3.11 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.

Part Number Description Price Documentation
DC1052A-A LTC4218 Demo Board: 12V and 24V, 7.5A Hot Swap Controller with Current Monitoring $50.00
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