LT3782 - 2-Phase Step-Up DC/DC Controller


  • 2-Phase Operation Reduces Required Input and Output Capacitance
  • Programmable Switching Frequency: 150kHz to 500kHz
  • 6V to 40V Input Range
  • 10V Gate Drive with VCC ≥13V
  • High Current Gate Drive (4A)
  • Programmable Soft-Start and Current Limit
  • Programmable Slope Compensation for High Noise Immunity
  • MOSFET Gate Signals with Programmable Falling Edge Delay for External Synchronous Drivers
  • Programmable Undervoltage Lockout
  • Programmable Duty Cycle Clamp (50% or Higher)
  • Thermally Enhanced 28-Lead TSSOP and 4mm x 5mm QFN Packages

Typical Application

LT3782 Typical Application
LT3782 Typical Application


The LT3782 is a current mode two phase step-up DC/DC converter controller. Its high switching frequency (up to 500kHz) and 2-phase operation reduce system filtering capacitance and inductance requirements.

With 10V gate drive (VCC ≥13V) and 4A peak drive current, the LT3782 can drive most industrial grade high power MOSFETs with high efficiency. For synchronous applications, the LT3782 provides synchronous gate signals with programmable falling edge delay to avoid cross conduction when using external MOSFET drivers. Other features include programmable undervoltage lockout, soft-start, current limit, duty cycle clamp (50% or higher) and slope compensation.

The LT3782 is available in a thermally enhanced 28-lead TSSOP and 4mm x 5mm QFN packages.

For new designs use the LT3782A which has improved
phase matching


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
LT3782EFE#PBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT3782EFE#TRPBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT3782EUFD#PBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LT3782EUFD#TRPBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LT3782IFE#PBF TSSOP-28 FE I 05-08-1663 (EB) Yes
LT3782IFE#TRPBF TSSOP-28 FE I 05-08-1663 (EB) Yes

LT3782 Package Drawing
LT3782 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
LT3782EFE#PBF TSSOP-28 E $5.59 $4.70 Yes
LT3782EFE#TRPBF TSSOP-28 E $4.76 Yes
LT3782EUFD#PBF 4x5 QFN-28 E $5.59 $4.70 Yes
LT3782EUFD#TRPBF 4x5 QFN-28 E $4.76 Yes
LT3782IFE#PBF TSSOP-28 I $6.90 $4.83 Yes
LT3782IFE#TRPBF TSSOP-28 I $4.89 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
DC1234B LT3782AEFE Demo Board | 2-Phase Step-Up Controller $200.00
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Click here to view our complete list of demo boards


  • Industrial Equipment
  • Telecom Infrastructure
  • Interleaved Isolated Power Supply

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