LTC3371 - 4-Channel 8A Configurable Buck DC/DCs with Watchdog and Power-On Reset


  • 8 × 1A Buck Power Stages Configurable as 2, 3 or 4 Output Channels
  • 8 Unique Output Configurations (1A to 4A Per Channel)
  • Independent VIN Supplies for Each DC/DC (2.25V to 5.5V)
  • Low Total No Load Supply Current:
  • 15μA In Shutdown (All Channels Off)
  • 68μA One Channel Active in Burst Mode® Operation
  • 18μA Per Additional Channel
  • Precision Enable Pin Thresholds for Autonomous Sequencing
  • 1MHz to 3MHz RT Programmable Frequency (2MHz Default) or PLL Synchronization
  • Temp Monitor Indicates Die Temperature
  • CT Programmed Watchdog Timer
  • Independent RST Pins Indicate Buck in Regulation
  • Thermally Enhanced 38-Lead 5mm × 7mm QFN and TSSOP Packages

Typical Application

LTC3371 Typical Application
LTC3371 Typical Application


The LTC®3371 is a highly flexible multioutput power supply IC. The device includes four synchronous buck converters, configured to share eight 1A power stages, each of which is powered from independent 2.25V to 5.5V inputs.

The DC/DCs are assigned to one of eight possible power configurations via pin programmable C1-C3 pins. The common buck switching frequency may be programmed with an external resistor, synchronized to an external oscillator, or set to a default internal 2MHz clock. The operating mode for all DC/DCs may be programmed for Burst Mode or forced continuous mode operation.

The CT pin programs the timing parameters of four independent RST pins as well as the watchdog timer.

To reduce input noise, the buck converters are phased in 90° steps. Precision enable pin thresholds facilitate reliable power sequencing. The LTC3371 is available in low profile 38-lead 5mm × 7mm QFN and 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
LTC3371EFE#PBF TSSOP-38 FE E 05-08-1772 Yes
LTC3371EFE#TRPBF TSSOP-38 FE E 05-08-1772 Yes
LTC3371EUHF#PBF 5x7 QFN-38 UHF E 05-08-1701 Yes
LTC3371EUHF#TRPBF 5x7 QFN-38 UHF E 05-08-1701 Yes
LTC3371HFE#PBF TSSOP-38 FE H 05-08-1772 Yes
LTC3371HFE#TRPBF TSSOP-38 FE H 05-08-1772 Yes
LTC3371HUHF#PBF 5x7 QFN-38 UHF H 05-08-1701 Yes
LTC3371HUHF#TRPBF 5x7 QFN-38 UHF H 05-08-1701 Yes
LTC3371IFE#PBF TSSOP-38 FE I 05-08-1772 Yes
LTC3371IFE#TRPBF TSSOP-38 FE I 05-08-1772 Yes
LTC3371IUHF#PBF 5x7 QFN-38 UHF I 05-08-1701 Yes
LTC3371IUHF#TRPBF 5x7 QFN-38 UHF I 05-08-1701 Yes

LTC3371 Package Drawing
LTC3371 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
LTC3371EFE#PBF TSSOP-38 E $6.43 $4.50 Yes
LTC3371EFE#TRPBF TSSOP-38 E $4.56 Yes
LTC3371EUHF#PBF 5x7 QFN-38 E $5.93 $4.15 Yes
LTC3371EUHF#TRPBF 5x7 QFN-38 E $4.21 Yes
LTC3371HFE#PBF TSSOP-38 H $7.57 $5.30 Yes
LTC3371HFE#TRPBF TSSOP-38 H $5.36 Yes
LTC3371HUHF#PBF 5x7 QFN-38 H $6.93 $4.85 Yes
LTC3371HUHF#TRPBF 5x7 QFN-38 H $4.91 Yes
LTC3371IFE#PBF TSSOP-38 I $7.07 $4.95 Yes
LTC3371IFE#TRPBF TSSOP-38 I $5.01 Yes
LTC3371IUHF#PBF 5x7 QFN-38 I $6.50 $4.55 Yes
LTC3371IUHF#TRPBF 5x7 QFN-38 I $4.61 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
DC2182A LTC3371EFE Demo Board | 4-Ch 8A Configurable Bucks with Watchdog/Power-On Reset, 2.25V ≤ VIN ≤ 5.5V, VOUT1-4 = 1.2V, 1.8V, 2.5V, 3.3V@2A Each Contact Factory
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  • General Purpose Multichannel Power Supplies: Automotive, Industrial, Distributed Power Systems

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Design Tools

Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:

  • LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
  • LTpowerCAD - A complete power supply selection, synthesis and design tool
  • LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
  • PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
  • Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
  • LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
  • And More!

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