LTC3124 - 15V, 5A 2-Phase Synchronous Step-Up DC/DC Converter with Output Disconnect


  • VIN Range: 1.8V to 5.5V, 500mV After Start-Up
  • Adjustable Output Voltage: 2.5V to 15V
  • 1.5A Output Current for VIN = 5V and VOUT = 12V
  • Dual-Phase Control Reduces Output Voltage Ripple
  • Output Disconnects from Input When Shut Down 
  • Synchronous Rectification: Up to 95% Efficiency
  • Inrush Current Limit
  • Up to 3MHz Programmable Switching Frequency Synchronizable to External Clock
  • Selectable Burst Mode® Operation: 25μA IQ
  • Output Overvoltage Protection
  • Internal Soft-Start
  • <1μA IQ in Shutdown
  • 16-Lead, Thermally- Enhanced 3mm × 5mm × 0.75mm DFN and TSSOP Packages

Typical Application

LTC3124 Typical Application
LTC3124 Typical Application


The LTC®3124 is a dual-phase, synchronous step-up DC/ DC converter with true output disconnect and inrush current limiting capable of providing output voltages up to 15V. Dual-phase operation significantly reduces peak inductor and capacitor ripple currents, minimizing inductor and capacitor size. The 2.5A per phase current limit, along with the ability to program output voltages up to 15V make the LTC3124 well suited for a variety of demanding applications. Once started, operation will continue with inputs down to 500mV.

The LTC3124 switching frequency can be programmed from 100kHz to 3MHz to optimize applications for highest efficiency or smallest solution footprint. The oscillator can be synchronized to an external clock for noise sensitive applications. Selectable Burst Mode operation reduces quiescent current to 25μA, ensuring high efficiency across the entire load range. An internal soft-start limits inrush current during start-up.

Other features include a <1μA shutdown current and robust protection under short-circuit, thermal overload, and output overvoltage conditions. The LTC3124 is offered in both 16-lead DFN and thermally-enhanced TSSOP packages.


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
LTC3124EDHC#PBF 5x3 DFN-16 DHC E 05-08-1706 Yes
LTC3124EDHC#TRPBF 5x3 DFN-16 DHC E 05-08-1706 Yes
LTC3124EFE#PBF TSSOP-16 FE E 05-08-1663 (BC) Yes
LTC3124EFE#TRPBF TSSOP-16 FE E 05-08-1663 (BC) Yes
LTC3124HFE#PBF TSSOP-16 FE H 05-08-1663 (BC) Yes
LTC3124HFE#TRPBF TSSOP-16 FE H 05-08-1663 (BC) Yes
LTC3124IDHC#PBF 5x3 DFN-16 DHC I 05-08-1706 Yes
LTC3124IDHC#TRPBF 5x3 DFN-16 DHC I 05-08-1706 Yes
LTC3124IFE#PBF TSSOP-16 FE I 05-08-1663 (BC) Yes
LTC3124IFE#TRPBF TSSOP-16 FE I 05-08-1663 (BC) Yes

LTC3124 Package Drawing
LTC3124 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
LTC3124EDHC#PBF 5x3 DFN-16 E $4.66 $3.26 Yes
LTC3124EDHC#TRPBF 5x3 DFN-16 E $3.32 Yes
LTC3124EFE#PBF TSSOP-16 E $4.66 $3.26 Yes
LTC3124EFE#TRPBF TSSOP-16 E $3.32 Yes
LTC3124HFE#PBF TSSOP-16 H $5.71 $4.00 Yes
LTC3124HFE#TRPBF TSSOP-16 H $4.06 Yes
LTC3124IDHC#PBF 5x3 DFN-16 I $5.36 $3.75 Yes
LTC3124IDHC#TRPBF 5x3 DFN-16 I $3.81 Yes
LTC3124IFE#PBF TSSOP-16 I $5.36 $3.75 Yes
LTC3124IFE#TRPBF TSSOP-16 I $3.81 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
DC1859A LTC3124 Demo Board | 2-Phase Sync Boost, 1.8V ≤ VIN ≤ 5.5V, VOUT = 12V @ Up to 1.5A $150.00
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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:

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