LTC7124 - 17V, Dual 3.5A Synchronous Step-Down Regulator with Ultralow Quiescent Current


  • Wide VIN Range: 3.1V to 17V
  • Wide VOUT Range: 0.6V to 99% VIN
  • Dual Step-Down Outputs: 3.5A Per Channel
  • Integrated 80mΩ/40mΩ N-Channel MOSFETs. Provide Up to 95% Efficiency
  • No-Load IQ < 8μA with Both Channels Enabled; IQ < 5.5μA with Only One Channel Enabled
  • Programmable Frequency (500kHz to 4MHz) with ±25% Frequency Synchronization Range
  • Configurable for a 2-Phase Single Output at Up to 7A
  • ±1.0% Output Voltage Accuracy
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Internal or Programmable External Loop Compensation
  • Available in a 3mm × 5mm QFN-24 Package

Typical Application

LTC7124 Typical Application
LTC7124 Typical Application


The LTC®7124 is a dual channel, 3.5A per output, high efficiency monolithic step-down regulator capable of operating from input supplies up to 17V. The programmable switching frequency ranges from 500kHz to 4MHz with a ±25% external clock synchronization capability around the programmed frequency. The regulator features ultralow quiescent current for high efficiency over a wide VOUT range.

The step-down regulator operates from an input voltage range of 3.1V to 17V and provides an adjustable output range from 0.6V to 99% of VIN while delivering up to 3.5A of output current per channel. A user selectable mode input is provided to allow the user to trade off output ripple for light load efficiency; Burst Mode® operation provides the highest efficiency at light loads, while forced continuous operation provides the lowest output ripple. The LTC7124 includes spread spectrum modulation for low radiated and conductive noise. The LTC7124 is offered in a thermally enhanced, low profile 24-lead 3mm × 5mm QFN package.


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

Part Number Package Code Temp Package
LTC7124EUDD#PBF 3x5 UDD-24 UDD E 05-08-1537 Yes
LTC7124EUDD#TRPBF 3x5 UDD-24 UDD E 05-08-1537 Yes
LTC7124IUDD#PBF 3x5 UDD-24 UDD I 05-08-1537 Yes
LTC7124IUDD#TRPBF 3x5 UDD-24 UDD I 05-08-1537 Yes

LTC7124 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
LTC7124EUDD#PBF 3x5 UDD-24 E $5.79 $4.05 Yes
LTC7124EUDD#TRPBF 3x5 UDD-24 E $5.85 $4.11 Yes
LTC7124IUDD#PBF 3x5 UDD-24 I $6.36 $4.45 Yes
LTC7124IUDD#TRPBF 3x5 UDD-24 I $6.42 $4.51 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
DC2329A LTC7124 Demo Board | 17VIN, Dual 3.5A Synchronous Step-Down Regulator with Ultra-Low Quiescent Current $349.00
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Click here to view our complete list of demo boards


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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

Models for the following parts are available in LTspice:


The LTpowerCAD 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

To open the project file for this circuit:

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

Design tools for the following parts are available in LTpowerCAD:
LTC7124 Parallel

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