LTC3877

RECOMMENDED FOR NEW DESIGNS

Dual Phase Step-Down Synchronous Controller with VID Output Voltage Programming and Low Value DCR Sensing

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Overview

  • 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

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.

Applications

  • FPGAs and Processor Power
  • Servers and Computing
LTC3877
Dual Phase Step-Down Synchronous Controller with VID Output Voltage Programming and Low Value DCR Sensing
High Efficiency Dual Phase Single Output, 400kHz, 0.9V/60A Step-Down Converter Efficiency and Power Loss vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 2

Technical Articles 3

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2980
RECOMMENDED FOR NEW DESIGNS 16-Channel PMBus Power System Manager
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Evaluation Kits

eval board
schematic 1
DC2229A-B

LTC3877/LTC3874 Demo Board | 4-Phase Buck Controller with VID Inputs, Sub-mΩ DCR Sensing, 6V ≤ VIN ≤ 14V, VOUT = 0.6V to 1.23V at 120A

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Product Details

Demonstration circuits 2229A-A and 2229A-B feature the LTC3877 in two high output current, high efficiency, VID programmed step-down converters with sub-mΩ DCR sensing. For both converters, the input voltage range is 6V to 14V and the switching frequency is 400kHz.

eval board
schematic 2
DC2229A-A

LTC3877 Demo Board | Dual Buck Controller, Sub-mΩ DCR Sensing, 6V ≤ VIN ≤ 14V, VOUT1 is VID Programmable from 0.6V to 1.23V @ 30A, VOUT2 is 1.5V @ 30A

Buy Now View Details

Product Details

Demonstration circuits 2229A-A and 2229A-B feature the LTC3877 in two high output current, high efficiency, VID programmed step-down converters with sub-mΩ DCR sensing. For both converters, the input voltage range is 6V to 14V and the switching frequency is 400kHz.
DC2229A-B
LTC3877/LTC3874 Demo Board | 4-Phase Buck Controller with VID Inputs, Sub-mΩ DCR Sensing, 6V ≤ VIN ≤ 14V, VOUT = 0.6V to 1.23V at 120A
DC2229A - Schematic
DC2229A-A
LTC3877 Demo Board | Dual Buck Controller, Sub-mΩ DCR Sensing, 6V ≤ VIN ≤ 14V, VOUT1 is VID Programmable from 0.6V to 1.23V @ 30A, VOUT2 is 1.5V @ 30A
DC2229A-A - Schematic

Reference Designs

Arria 10 (Rev E3- Linear Technology) Dev Kit
Arria 10 (Rev E3- Linear Technology) Dev Kit
Arria 10 FPGA Development Kit (Power Tree Representative of Actual Components Used on Board)
Simplied Power Tree that directly steps down 12V to required I/O voltage
Arria 10 (Rev E3- Linear Technology) Dev Kit Block Diagram
Altera Arria 10 FPGA Development Kit Circuits from the lab

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Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
Altera Arria 10 FPGA Development Kit
Arria 10 (Rev E3- Linear Technology) Dev Kit
Arria 10 FPGA Development Kit (Power Tree Representative of Actual Components Used on Board)
Simplied Power Tree that directly steps down 12V to required I/O voltage
Arria 10 (Rev E3- Linear Technology) Dev Kit Block Diagram

Latest Discussions

2 Years Ago
VID Output Voltage Programming Buck Regulator
2 Years Ago
LTC3877 Design Query
3 Years Ago
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