LTC3874

RECOMMENDED FOR NEW DESIGNS

PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing

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Overview

  • Phase Extender for High Phase Count Voltage Rails
  • Accurate Phase-to-Phase Current Sharing
  • Sub-Milliohm DCR Current Sensing
  • Phase-Lockable Fixed Frequency 250kHz to 1MHz
  • Immediate Response to Master IC's Fault
  • Up to 12 Phase Operation
  • Wide VIN Range: 4.5V to 38V
  • VOUT Range:
    • Up to 3.5V (LOWDCR Pin = INTVCC)
    • Up to 5.5V (LOWDCR Pin = OV)
  • Proprietary Current Mode Control Loop
  • Programmable CCM/DCM Operation
  • Programmable Phase Shift Control
  • Dual N-Channel MOSFET Gate Drivers
  • 28-Lead (4mm × 5mm) QFN Package
LTC3874
PolyPhase Step-Down Synchronous Slave Controller with Sub-Milliohm DCR Sensing
High Efficiency, 4-Phase 1.8V/120A Step-Down Supply Dual Phase Efficiency and Power Loss vs Output Current, Sub-Milliohm DCR vs Traditional DCR Product Package 1
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Documentation

Data Sheet 1

User Guide 3

Design Note 2

Technical Articles 4

Data Sheet

This is the most up-to-date revision of the 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
LTC2977
RECOMMENDED FOR NEW DESIGNS 8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC3874
  • LTC3874-1

LTpowerCAD 1

LTpowerPlay®

LTpowerPlay® is a powerful, Windows-based development environment supporting Linear Technology's Digital Power System Management (PSM) products.

Open Tool
LTspice

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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

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-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

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.

eval board
schematic 3
DC2142A

LTC3875EUJ/LTC3874IUFD Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A

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Product Details

Demonstration circuit 2142A is a high efficiency, high density, 4-phase synchronous buck converter with a 4.5V to 14V input range. It can supply 120A maximum load current at a 1.0V output. This demo board incorporates the LTC3875EUJ and LTC3874IUFD master/slave controllers.

eval board
schematic 4
DC2142A

LTC3875EUJ/LTC3874IUFD Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A

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Product Details

Demonstration circuit 2142A is a high efficiency, high density, 4-phase synchronous buck converter with a 4.5V to 14V input range. It can supply 120A maximum load current at a 1.0V output. This demo board incorporates the LTC3875EUJ and LTC3874IUFD master/slave controllers.

eval board
schematic 5
DC2084A

LTC3884EUK/LTC3874EUFD Demo Board | PolyPhase Digital PSM Buck with Sub-mΩ DCR Sensing Plus Two Slave Controllers, 10V ≤ VIN ≤ 14V, VOUT = 0.5V to 1.5V @ 240A

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Product Details

Demonstration circuit 2084A is a high efficiency, high density, single-output step-down solution featuring the LTC3884 and two LTC3874's. The LTC3884 is a dual output PolyPhase® step-down controller with ultralow DCR sensing and digital power system management. The LTC3874 is a PolyPhase step-down synchronous slave controller also with sub-milliohm DCR Sensing. The combination provides a circuit with a 10V to 14V input voltage range that can supply up to 240A of output current. The default output voltage is 1V, but can be set from 0.5V to 1.5V.


The DC2084A powers up to default settings and produces power based on configuration resistors or with its non-volatile memory without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay® and use LTC’s I2C/SMBus/PMBus dongle DC1613A to connect to the board.

eval board
schematic 6
DC2084A

LTC3884EUK/LTC3874EUFD Demo Board | PolyPhase Digital PSM Buck with Sub-mΩ DCR Sensing Plus Two Slave Controllers, 10V ≤ VIN ≤ 14V, VOUT = 0.5V to 1.5V @ 240A

Buy Now View Details

Product Details

Demonstration circuit 2084A is a high efficiency, high density, single-output step-down solution featuring the LTC3884 and two LTC3874's. The LTC3884 is a dual output PolyPhase® step-down controller with ultralow DCR sensing and digital power system management. The LTC3874 is a PolyPhase step-down synchronous slave controller also with sub-milliohm DCR Sensing. The combination provides a circuit with a 10V to 14V input voltage range that can supply up to 240A of output current. The default output voltage is 1V, but can be set from 0.5V to 1.5V.


The DC2084A powers up to default settings and produces power based on configuration resistors or with its non-volatile memory without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay® and use LTC’s I2C/SMBus/PMBus dongle DC1613A to connect to the board.
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-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
DC2142A
LTC3875EUJ/LTC3874IUFD Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A
DC2142A
DC2142A
LTC3875EUJ/LTC3874IUFD Demo Board | 4.5V ≤ VIN ≤ 14V; VOUT: 1V @ 120A
DC2142A
DC2084A
LTC3884EUK/LTC3874EUFD Demo Board | PolyPhase Digital PSM Buck with Sub-mΩ DCR Sensing Plus Two Slave Controllers, 10V ≤ VIN ≤ 14V, VOUT = 0.5V to 1.5V @ 240A
DC2084A Demo Board Schematic Image
DC2084A
LTC3884EUK/LTC3874EUFD Demo Board | PolyPhase Digital PSM Buck with Sub-mΩ DCR Sensing Plus Two Slave Controllers, 10V ≤ VIN ≤ 14V, VOUT = 0.5V to 1.5V @ 240A
DC2084A Demo Board Schematic Image

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

View Detailed Reference Design

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

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