1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. External Power Switch Buck Controllers
  6. LTC3773


Features and Benefits

  • Current Mode Controller with On-board MOSFET Drivers
  • Programmable Power Up/Down Tracking
  • Wide VIN Range: 3.3V to 36V (VCC = 5V)
  • ±1% 0.6V VFB Accuracy Over Temperature
  • Power Good Output Voltage Monitor
  • Phase-Lockable or Adjustable Frequency: 160kHz to 700kHz
  • OPTI-LOOP® Compensation Minimizes COUT
  • Current Foldback and Overvoltage Protection
  • Selectable Continuous, Discontinuous or Burst Mode® Operation at Light Load
  • Programmable Phase Operation
  • Available in 5mm × 7mm QFN and 36-Lead
  • SSOP Packages

Product Details

The LTC3773 is a high performance, 3-phase, triple output synchronous step-down switching regulator controller with output voltage power up/down tracking capability. The controller allows for sequential, coincident or ratiometric tracking.

This 3-phase controller drives its output stages with 120° phase separation at frequencies of up to 700kHz per phase minimizing the RMS input current. Light load efficiency can be maximized by using selectable Burst Mode operation. The 0.6V precision reference supports output voltages from 0.6V to 5V.

Fault protection features include output overvoltage, input undervoltage lockout plus current foldback under short-circuit or overload conditions.


  • Servers, Telecom, Industrial Power Supplies
  • General Purpose Multiple Rail DC/DC
  • FPGA and DSP Requirements

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

Tools & Simulations


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.


Models for the following parts are available in LTspice:


Product Recommendations

LTC3773 Companion Parts

Recommended Related Parts

Recommended Suggested Oscillator

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC3773EG#PBF Material Declaration Reliability Data 36-Lead SSOP
LTC3773EG#TRPBF Material Declaration Reliability Data 36-Lead SSOP
LTC3773EUHF#PBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
LTC3773EUHF#TRPBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
Wafer Fabrication Data R384 Reliability Data

PCN-PDN Information

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Sample & Buy

Ordering FAQs

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Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)The 1Ku 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 Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

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Price Table Help


Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.