LTC4211 - Hot Swap Controller with Multifunction Current Control


  • Allows Safe Board Insertion and Removal from a Live Backplane
  • Controls Supply Voltages from 2.5V to 16.5V
  • Programmable Soft-Start with Inrush Current Limiting, No External Gate Capacitor Required
  • Faster Turn-Off Time Because No External Gate Capacitor is Required
  • Dual Level Overcurrent Fault Protection
  • Programmable Response Time for Overcurrent Protection (MS)
  • Programmable Overvoltage Protection (MS)
  • Automatic Retry or Latched Mode Operation (MS)
  • High Side Drive for an External N-Channel FET
  • User-Programmable Supply Voltage Power-Up Rate
  • FB Pin Monitors VOUT and Signals RESET
  • Glitch Filter Protects Against Spurious RESET Signal

Typical Application

LTC4211 Typical Application
LTC4211 Typical Application


The LTC4211 is a Hot Swap controller that allows a board to be safely inserted and removed from a live backplane. An internal highside switch driver controls the gate of an external N-channel MOSFET for supply voltages ranging from 2.5V to 16.5V. The LTC4211 provides soft-start and in rush current limiting during the start-up period which has a programmable duration.

Two on-chip current limit comparators provide dual level overcurrent circuit breaker protection. The slow comparator trips at VCC – 50mV and activates in 20µs (or programmed by an external filter capacitor,MS only). The fast comparator trips at VCC – 150mV and typically responds in 300ns.

The FB pin monitors the output supply voltage and signals the RESET output pin. The ON pin signal turns the chip on and off and can also be used for the reset function. The MS package has FAULT and FILTER pins to provide additional functions like fault indication, autoretry or latch-off modes, programmable current limit response time and programmable overvoltage protection using an external Zener diode clamp.


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
LTC4211CMS#PBF MS-10 MS C 05-08-1661 Yes
LTC4211CMS#TRPBF MS-10 MS C 05-08-1661 Yes
LTC4211CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LTC4211CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC4211CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC4211CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC4211IMS#PBF MS-10 MS I 05-08-1661 Yes
LTC4211IMS#TRPBF MS-10 MS I 05-08-1661 Yes
LTC4211IMS8#PBF MS-8 MS8 I 05-08-1660 Yes
LTC4211IMS8#TRPBF MS-8 MS8 I 05-08-1660 Yes
LTC4211IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC4211IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes

LTC4211 Package Drawing
LTC4211 Package Drawing
LTC4211 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
LTC4211CMS#PBF MS-10 C $3.05 $2.55 Yes
LTC4211CMS#TRPBF MS-10 C $2.61 Yes
LTC4211CMS8#PBF MS-8 C $2.45 $2.10 Yes
LTC4211CMS8#TRPBF MS-8 C $2.16 Yes
LTC4211CS8#PBF SO-8 C $2.30 $1.95 Yes
LTC4211CS8#TRPBF SO-8 C $2.01 Yes
LTC4211IMS#PBF MS-10 I $3.50 $2.95 Yes
LTC4211IMS#TRPBF MS-10 I $3.01 Yes
LTC4211IMS8#PBF MS-8 I $2.85 $2.40 Yes
LTC4211IMS8#TRPBF MS-8 I $2.46 Yes
LTC4211IS8#PBF SO-8 I $2.70 $2.25 Yes
LTC4211IS8#TRPBF SO-8 I $2.31 Yes
Buy NowRequest Samples
* 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
DC536A-B LTC4211 Hot Swap Controller (20A version) $75.00
DC536B-A LTC4211CMS Demoboard | 7A Electronic Circuit Breaker and Hot Swap Controller $75.00
Buy Now
Click here to view our complete list of demo boards


  • Electronic Circuit Breaker
  • Hot Board Insertion and Removal (Either On Backplane or On Removable Card)
  • Industrial High Side Switch/Circuit Breaker

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email with questions and comments.

Design Tools


LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:

Technical Support