LTC3774 - Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing


  • Sub-Milliohm DCR Current Sensing
  • Operates with Power Blocks, DRMOS or External Gate Drivers and MOSFETs
  • Supports Phase Shedding and N+1 Phase Redundancy
  • Programmable DCR Temperature Compensation
  • ±0.75% Maximum Total DC Output Error Over Temperature
  • Dual Differential Remote Output Voltage Sense Amplifiers
  • Phase-Lockable Fixed Frequency Range: 200kHz to 1.2MHz
  • VIN Range: 4.5V to 38V
  • VOUT Range: 0.6V to 3.5V
  • Supports Smooth Start-Up into Pre-Biased Outputs
  • Programmable Soft-Start or VOUT Tracking
  • Hiccup Mode/Soft Recovery from Output Overcurrent
  • 36-Lead (5mm × 6mm) QFN Package

Typical Application

LTC3774 Typical Application


The LTC®3774 is a dual PolyPhase® current mode synchronous step-down switching regulator controller that drives power blocks, DRMOS or external gate drivers and power MOSFETs. It offers an LTC-proprietary technique that enhances the signal-to-noise ratio of the current sense signal, allowing the use of inductors with very low DC winding resistances as the current sense element for maximum efficiency and reduced jitter.

The maximum current sense voltage is programmable from 10mV to 30mV. High speed, low offset remote sense differential amplifiers and a precise 0.6V reference provide accurate output voltages between 0.6V and 3.5V from a wide 4.5V to 38V input supply range. Soft recovery from output shorts or overcurrent minimizes output overshoot. Burst Mode® operation, continuous and pulse-skipping modes are supported. The constant operating frequency can be synchronized to an external clock or linearly programmed from 200kHz to 1.2MHz. Up to six LTC3774 controllers can be paralleled for 1-, 2-, 3-, 4-, 6-, 8- or 12-phase operation.

The LTC3774 is available in a 36-lead (5mm × 6mm) 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
LTC3774EUHE#PBF 5x6 QFN-36 UHE E 05-08-1876 Yes
LTC3774EUHE#TRPBF 5x6 QFN-36 UHE E 05-08-1876 Yes
LTC3774IUHE#PBF 5x6 QFN-36 UHE I 05-08-1876 Yes
LTC3774IUHE#TRPBF 5x6 QFN-36 UHE I 05-08-1876 Yes

LTC3774 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
LTC3774EUHE#PBF 5x6 QFN-36 E $4.22 $2.95 Yes
LTC3774EUHE#TRPBF 5x6 QFN-36 E $3.01 Yes
LTC3774IUHE#PBF 5x6 QFN-36 I $4.79 $3.35 Yes
LTC3774IUHE#TRPBF 5x6 QFN-36 I $3.41 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
DC2002A LTC3774EUHE Demo Board | Dual Buck Controller, 7V ≤ VIN ≤ 14, Vout1 = 1.2V @ 30A, Vout2 = 1.5V @ 30A $150.00
DC2111A-A LTC3774EUHE Demo Board | Sync Buck Controller, 4-Phase (LTC3774 x2), 10V ≤ VIN ≤ 14V, Vout = 1.2V @ 90A Contact Factory
DC2111A-B LTC3774EUHE Demo Board | Sync Buck Controller, 4-Phase (LTC3774 x2), 10V ≤ VIN ≤ 14V, Vout = 1.2V @ 120A Contact Factory
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Click here to view our complete list of demo boards


  • Computer Systems
  • Telecom and Datacom Systems
  • Industrial Equipment
  • DC Power Distribution Systems

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Design Tools


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LTC3774 Parallel

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