LTC3611 - 10A, 32V Monolithic Synchronous Step-Down DC/DC Converter


  • 10A Output Current
  • Wide VIN Range = 4.5V to 32V (36V Maximum)
  • Internal N-Channel MOSFETs
  • True Current Mode Control
  • Optimized for High Step-Down Ratios
  • t0N(MIN) ≤ 100ns
  • Extremely Fast Transient Response
  • Stable with Ceramic COUT
  • ±1% 0.6V Voltage Reference
  • Power Good Output Voltage Monitor
  • Adjustable On-Time/Switching Frequency (>1MHz)
  • Adjustable Current Limit
  • Programmable Soft-Start
  • Output Overvoltage Protection
  • Optional Short-Circuit Shutdown Timer
  • Low Shutdown IQ: 15μA
  • Available in a 9mm × 9mm 64-Pin QFN Package

Typical Application

LTC3611 Typical Application
LTC3611 Typical Application


The LTC3611 is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 10A output current from a 4.5V to 32V (36V maximum) input supply. It uses a constant on-time valley current mode control architecture to deliver very low duty cycle operation at high frequency with excellent transient response. The operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT.

The LTC3611 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads.

Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and an optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit is user programmable. A power good output voltage monitor indicates when the output is in regulation. The LTC3611 is available in a compact 9mm × 9mm QFN package.


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
LTC3611EWP#PBF 9x9 QFN-64 WP E 05-08-1812 Yes
LTC3611EWP#TRPBF 9x9 QFN-64 WP E 05-08-1812 Yes
LTC3611IWP#PBF 9x9 QFN-64 WP I 05-08-1812 Yes
LTC3611IWP#TRPBF 9x9 QFN-64 WP I 05-08-1812 Yes

LTC3611 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
LTC3611EWP#PBF 9x9 QFN-64 E $13.93 $9.75 Yes
LTC3611EWP#TRPBF 9x9 QFN-64 E $9.85 Yes
LTC3611IWP#PBF 9x9 QFN-64 I $16.02 $11.21 Yes
LTC3611IWP#TRPBF 9x9 QFN-64 I $11.31 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
DC1318A LTC3611EWP Demo Board | 9V ≤ VIN ≤ 32V, Vout = 1.5V to 3.3V @ up to 10A $150.00
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Click here to view our complete list of demo boards


  • Point of Load Regulation
  • Distributed Power Systems

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Design Tools


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