LTC4233 - 10A Guaranteed SOA Hot Swap Controller


  • Allows Safe Board Insertion into a Live Backplane
  • Small Footprint
  • 10mΩ MOSFET Including RSENSE
  • Safe Operating Area Guaranteed at 41W, 30ms
  • Wide Operating Voltage Range: 2.9V to 15V
  • Adjustable, 11% Accurate Current Limit
  • Current and Temperature Monitor Outputs
  • Overtemperature Protection
  • Adjustable Current Limit Timer Before Fault
  • Power Good and Fault Outputs
  • Adjustable Inrush Current Control
  • 2.5% Accurate Undervoltage and Overvoltage Protection
  • Available in 38-Lead (5mm × 9mm) QFN Package
  • Pin Compatible with LTC4234

Typical Application

LTC4233 Typical Application
LTC4233 Typical Application


The LTC®4233 is an integrated solution for Hot Swap™ applications that allows a board to be safely inserted and removed from a live backplane. The part integrates a Hot Swap controller, power MOSFET and current sense resistor in a single package for small form factor applications. The MOSFET Safe Operating Area is production tested and guaranteed for the stresses in Hot Swap applications.

The LTC4233 provides separate inrush current control and an 11% accurate 11.2A current limit with output dependent foldback. The current limit threshold can be adjusted dynamically using the ISET pin. Additional features include a current monitor output that amplifies the sense resistor voltage for ground referenced current sensing and a MOSFET temperature monitor output. Thermal limit, overvoltage, undervoltage and power good monitoring are also provided. For a 20A pin compatible version see LTC4234.


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
LTC4233CWHH#PBF 5x9 QFN-38 WHH C 05-08-1934 Yes
LTC4233CWHH#TRPBF 5x9 QFN-38 WHH C 05-08-1934 Yes
LTC4233HWHH#PBF 5x9 QFN-38 WHH H 05-08-1934 Yes
LTC4233HWHH#TRPBF 5x9 QFN-38 WHH H 05-08-1934 Yes
LTC4233IWHH#PBF 5x9 QFN-38 WHH I 05-08-1934 Yes
LTC4233IWHH#TRPBF 5x9 QFN-38 WHH I 05-08-1934 Yes

LTC4233 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
LTC4233CWHH#PBF 5x9 QFN-38 C $5.64 $3.95 Yes
LTC4233CWHH#TRPBF 5x9 QFN-38 C $5.70 $4.01 Yes
LTC4233HWHH#PBF 5x9 QFN-38 H $7.12 $4.98 Yes
LTC4233HWHH#TRPBF 5x9 QFN-38 H $7.18 $5.04 Yes
LTC4233IWHH#PBF 5x9 QFN-38 I $6.21 $4.35 Yes
LTC4233IWHH#TRPBF 5x9 QFN-38 I $6.27 $4.41 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
DC2116A-B LTC4233 Demo Board | 10A Guaranteed SOA Hot Swap Controller $75.00
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