1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. High Input Voltage Buck Regulators
  6. LTC3877


Features and Benefits

  • 6-Bit Parallel VID (Voltage Identification) Inputs Set Output Voltage from 0.6V to 1.23V in 10mV Steps
  • Output Voltage Range: 0.6V to 5V (Without VID)
  • Ultra Low Value DCR/RSENSE Current Sensing
  • ±1% Maximum Total Regulation Voltage Accuracy Over Temperature
  • Dual Differential Remote Sensing Amplifiers
  • tON(MIN) = 40ns, Capable of Very Low Duty Cycles at High Frequency
  • Phase-Lockable Frequency from 250kHz to 1MHz
  • Current Mismatch Between Channels: 5% Max
  • Adjustable Soft-Start Current Ramping or Tracking
  • Multi-IC Operation Up To 12 Phases
  • Wide VIN Range: 4.5V to 38V
  • Dual Power Good Output Voltage Monitors
  • Output Overvoltage Protection
  • Foldback Output Current Limiting and Soft Recovery

Product Details

The LTC3877 is a VID-programmable, constant frequency current mode step-down controller using an advanced and proprietary architecture. This new architecture enhances the signal-to-noise ratio of the current sense signal, allowing the use of very low DC resistance power inductors to maximize efficiency in high current applications. This feature also dramatically reduces the current sensing error, so that current sharing is greatly improved in multi-phase low DCR applications. In addition, the controller achieves a minimum on-time of just 40ns, permitting the use of high switching frequency at high step-down ratios.

The LTC3877 features dual high speed remote sense differential amplifiers, programmable current sense limits and DCR temperature compensation to limit the maximum output current precisely over temperature. The LTC3877 also features a precise 0.6V reference with guaranteed accuracy of ±0.5%. The LTC3877 is available in a low profile 44-lead 7mm × 7mm QFN package.


  • FPGAs and Processor Power
  • Servers and Computing

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (2)

Reference Designs (1)

Product Recommendations

LTC3877 Companion Parts

Recommended Related Parts

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
LTC3877EUK#PBF Material Declaration Reliability Data 44-Lead QFN (7mm x 7mm x 0.75mm w/ EP)
LTC3877EUK#TRPBF Material Declaration Reliability Data 44-Lead QFN (7mm x 7mm x 0.75mm w/ EP)
LTC3877IUK#PBF Material Declaration Reliability Data 44-Lead QFN (7mm x 7mm x 0.75mm w/ EP)
LTC3877IUK#TRPBF Material Declaration Reliability Data 44-Lead QFN (7mm x 7mm x 0.75mm w/ EP)
Wafer Fabrication Data R526 Reliability Data

Sample & Buy

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Evaluation Boards

Pricing displayed is based on 1-piece.

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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.