LT3724 - High Voltage, Current Mode Switching Regulator Controller


  • Wide Input Range: 4V to 60V
  • Output Voltages up to 36V (Step-Down)
  • Burst Mode Operation: <100µA Supply Current
  • 10µA Shutdown Supply Current
  • ±1.3% Reference Accuracy
  • 200kHz Fixed Frequency
  • Drives N-Channel MOSFET
  • Programmable Soft-Start
  • Programmable Undervoltage Lockout
  • Internal High Voltage Regulator for Gate Drive
  • Thermal Shutdown
  • Current Limit Unaffected by Duty Cycle
  • 16-Pin Thermally Enhanced TSSOP Package

Typical Application

LT3724 Typical Application
LT3724 Typical Application


The LT3724 is a DC/DC controller used for medium power, low part count, low cost, high efficiency supplies. It offers a wide 4V-60V input range (7.5V minimum startup voltage) and can implement step-down, step-up, inverting and SEPIC topologies.

The LT3724 includes Burst Mode operation, which reduces quiescent current below 100µA and maintains high efficiency at light loads. An internal high voltage bias regulator allows for simple biasing and can be back driven to increase efficiency.

Additional features include fixed frequency current mode control for fast line and load transient response; a gate driver capable of driving large N-channel MOSFETs; a precision undervoltage lockout function; 10µA shutdown current; short-circuit protection; and a programmable soft-start function that directly controls output voltage slew rates at startup which limits inrush current, minimizes overshoot and facilitates supply sequencing.


For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LT3724EFE TSSOP-16 FE E 05-08-1663 (BC) RoHS
LT3724EFE#PBF TSSOP-16 FE E 05-08-1663 (BC) RoHS
LT3724EFE#TR TSSOP-16 FE E 05-08-1663 (BC) RoHS
LT3724EFE#TRPBF TSSOP-16 FE E 05-08-1663 (BC) RoHS
LT3724IFE TSSOP-16 FE I 05-08-1663 (BC) RoHS
LT3724IFE#PBF TSSOP-16 FE I 05-08-1663 (BC) RoHS
LT3724IFE#TR TSSOP-16 FE I 05-08-1663 (BC) RoHS
LT3724IFE#TRPBF TSSOP-16 FE I 05-08-1663 (BC) RoHS
LT3724MPFE TSSOP-16 FE MP 05-08-1663 (BC) RoHS
LT3724MPFE#PBF TSSOP-16 FE MP 05-08-1663 (BC) RoHS
LT3724MPFE#TR TSSOP-16 FE MP 05-08-1663 (BC) RoHS
LT3724MPFE#TRPBF TSSOP-16 FE MP 05-08-1663 (BC) RoHS

LT3724 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
LT3724EFE TSSOP-16 E $7.38 $6.20 No
LT3724EFE#PBF TSSOP-16 E $3.69 $3.10 Yes
LT3724EFE#TR TSSOP-16 E $6.40 No
LT3724EFE#TRPBF TSSOP-16 E $3.20 Yes
LT3724IFE TSSOP-16 I $11.28 $7.90 No
LT3724IFE#PBF TSSOP-16 I $5.64 $3.95 Yes
LT3724IFE#TR TSSOP-16 I $8.14 No
LT3724IFE#TRPBF TSSOP-16 I $4.07 Yes
LT3724MPFE TSSOP-16 MP $8.49 $5.94 No
LT3724MPFE#PBF TSSOP-16 MP $8.49 $5.94 Yes
LT3724MPFE#TR TSSOP-16 MP $6.00 No
LT3724MPFE#TRPBF TSSOP-16 MP $6.00 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
DC736A LT3724EFE | High Voltage Step-Down Controller, 30V to 60Vin, 24Vout @ 3A $125.00
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Click here to view our complete list of demo boards


  • Industrial Power Distribution
  • 12V and 42V Automotive and Heavy Equipment
  • High Voltage Single Board Systems
  • Distributed Power Systems
  • Avionics
  • Telecom Power

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Design Tools


The LTpowerCAD II design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:


LTspice® IV 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 IV

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 IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV 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 IV:

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