LTC3855

PRODUCTION

Dual, Multiphase Synchronous DC/DC Controller with Differential Remote Sense

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  • Part Details
  • Documentation
  • Hardware Ecosystem
  • Tools & Simulations
  • Evaluation Kits
  • Reference Designs
  • Latest Discussions
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    Part Details

    • Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
    • High Efficiency: Up to 95%
    • RSENSE or DCR Current Sensing
    • Programmable DCR Temperature Compensation
    • ±0.75% 0.6V Output Voltage Accuracy
    • Phase-Lockable Fixed Frequency 250kHz to 770kHz
    • True Remote Sensing Differential Amplifier
    • Dual N-Channel MOSFET Synchronous Drive
    • Wide VIN Range: 4.5V to 38V
    • VOUT Range: 0.6V to 12.5V without Differential Amplifier
    • VOUT Range: 0.6V to 3.3V with Differential Amplifier
    • Clock Input and Output for Up to 12-Phase Operation
    • Adjustable Soft-Start or VOUT Tracking
    • Foldback Output Current Limiting
    • Output Overvoltage Protection
    • 40-Pin (6mm × 6mm) QFN and 38-Lead FE Packages
    LTC3855
    Dual, Multiphase Synchronous DC/DC Controller with Differential Remote Sense
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    Documentation

    Data Sheet 1

    Reliability Data 1

    User Guide 3

    Application Note 2

    Design Note 1

    Technical Articles 2

    Data Sheet

    This is the most up-to-date revision of the Data Sheet.

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    Hardware Ecosystem

    Parts Product Life Cycle Description
    Circuit Monitors 1
    LTC2960
    		RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
    Power System Management (PSM) & Sequencers 1
    LTC2974
    		RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
    Protection Switches & Controllers 1
    LTC4364
    		RECOMMENDED FOR NEW DESIGNS Surge Stopper with Ideal Diode
    Switching Regulators & Controllers 1
    LTC3880
    		RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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    Tools & Simulations

    LTspice 2

    Models for the following parts are available in LTspice:

    • LTC3855

    LTpowerCAD 6

    Design tools for the following parts are available in LTpowerCAD:

    • LTC3855
    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
    DC1617A-A

    LTC3855EFE Demo Board | Dual Output VIN = 4.5V to 26V, VOUT1 = 2.5V @ 15A, VOUT2 = 1.8V @ 15A

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    Product Details

    Demonstration circuit DC1617A is a dual output synchronous buck converter featuring the LTC3855EFE in a high density, two sided drop-in layout with power components on the top and the control circuit on the bottom. The package style for the LTC3855EFE is a 38-lead TSSOP. The board comes in two assembly types. The –A assembly provides 2.5V/15A and 1.8V/15A from a 4.5V to 26V input. DCR inductor sensing is used to provide the highest efficiency. The current limit is NTC compensated to provide the minimal amount of variation over temperature. The -A also features remote sensing for VOUT2.

    eval board
    schematic 2
    DC1617A-B

    LTC3855EFE Demo Board | Dual Output VIN = 13V to 36V, VOUT1 = 12V @ 6A, VOUT2 = 5V @ 10A

    Buy Now View Details

    Product Details

    Demonstration circuit DC1617A is a dual output synchronous buck converter featuring the LTC3855EFE in a high density, two sided drop-in layout with power components on the top and the control circuit on the bottom. The package style for the LTC3855EFE is a 38-lead TSSOP. The board comes in two assembly types. The –B assembly is a high power, 12V/6A and 5V/10A converter with a 13V to 36V input. A sense resistor is used to provide a precise current limit. Unlike the –A assembly, on the –B assembly the remote sense diff amp is bypassed since VOUT2 is > 3.3V.

    eval board
    schematic 3
    DC1441A

    LTC3855EUJ Demo Board | Dual Output, VIN = 4.5V to 14V, VOUT1 = 1.8V @ 17A, VOUT2 = 1.2V @ 17A

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    Product Details

    Demonstration circuit DC1441A is a dual output synchronous buck converter featuring the LTC3855EUJ. The board provides two outputs of 1.8V/17A and 1.2V/17A from an input voltage of 4.5V to 14V at a switching frequency of 400kHz.

    eval board
    schematic 4
    DC1586A

    LTC3855EUJ Demo Board | Dual Output, VIN = 4.5V to 25V, VOUT1 = 3.3V @ 5A, VOUT2 = 2.5V @ 5A

    Buy Now View Details

    Product Details

    Demonstration circuit 1586A is a high efficiency, dual-output (3.3V and 2.5V), synchronous buck converter with 4.5V to 25V input range. It can supply 5A maximum load current at 3.3V and 2.5V outputs. The demo board uses the LTC3855EUJ controller. The LTC3855 is a feature-rich dual-output dual-phase synchronous buck controller with on-chip drivers, remote output voltage sensing (VOUT2) and inductor DCR temperature compensation.
    DC1617A-A
    LTC3855EFE Demo Board | Dual Output VIN = 4.5V to 26V, VOUT1 = 2.5V @ 15A, VOUT2 = 1.8V @ 15A
    DC1617A-B
    LTC3855EFE Demo Board | Dual Output VIN = 13V to 36V, VOUT1 = 12V @ 6A, VOUT2 = 5V @ 10A
    DC1441A
    LTC3855EUJ Demo Board | Dual Output, VIN = 4.5V to 14V, VOUT1 = 1.8V @ 17A, VOUT2 = 1.2V @ 17A
    DC1586A
    LTC3855EUJ Demo Board | Dual Output, VIN = 4.5V to 25V, VOUT1 = 3.3V @ 5A, VOUT2 = 2.5V @ 5A

    Reference Designs

    Terasic DE2i-150 Cyclone IV Board
    Terasic DE2i-150 Cyclone IV Board
    LTC Parts List
    Terasic DE2i-150 Cyclone IV Block Diagram
    DE2i-150 Power Tree
    Terasic DE2i-150 Cyclone IV Board 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
    DK-DEV-5AGXB3NES Dev Kit
    DK-DEV-5AGXB3NES Dev Kit
    LTC Parts List
    DK-DEV-5AGXB3NES Block Diagram
    DK-DEV-5AGXB3NES Power Tree
    Altera Arria V GX 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
    Stratix V Advanced System Development Board
    Stratix V Advanced System Development Board
    Stratix V Advanced System Development Board Block Diagram
    Stratix V Advanced Systems Development Board Power Tree
    Stratix V Advanced System Development Board 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
    DK-DEV-5AGTD7N Dev Kit
    DK-DEV-5AGTD7N Dev Kit
    LTC Parts List
    DK-DEV-5AGTD7N Block Diagram
    DK-DEV-5AGTD7N Block Diagram
    DK-DEV-5AGTD7N Power Tree
    Altera Arria V GT 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
    DC934A Demo Board for DK-DEV-5CSXC6N
    DC934A Demo Board for DK-DEV-5CSXC6N
    DK-DEV-5CSXC6N Dev Kit
    DK-DEV-5CSXC6N Block Diagram
    DK-DEV-5CSXC6N Power Tree
    DK-DEV-5CSXC6N LTC Power Tree
    Altera Cyclone V SoC Development Kit and SoC Embedded Design Suite 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
    DK-DEV-5SGSMD5N DSP Dev Kit
    DK-DEV-5SGSMD5N DSP Dev Kit
    LTC Parts List
    DK-DEV-5SGSMD5N Block Diagram
    DK-DEV-5SGSMD5N Power Tree
    Altera DSP Development Kit, Stratix V Edition 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
    DK-SI-5SGXEA7N Kit
    DK-SI-5SGXEA7N Kit
    LTC Parts List
    DK-SI-5SGXEA7N Block Diagram
    DK-SI-5SGXEA7N Block Diagram
    DK-SI-5SGXEA7N Power Tree
    Altera Transceiver Signal Integrity Kit, Stratix V GX Edition 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
    DK-DEV-5CGXC7NES Dev Kit
    DK-DEV-5CGXC7NES Dev Kit
    LTC Parts List
    DK-DEV-5CGXC7NES Block Diagram
    DK-DEV-5CGXC7NES Block Diagram
    DK-DEV-5CGXC7NES Power Tree
    Altera Cyclone V GX Development Kit (Discontinued) 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
    Arria V SoC Development Kit
    Arria V SoC Development Kit
    DK-DEV-5ASTD5NES Block Diagram
    DK-DEV-5ASTD5NES Power Tree
    Altera Arria V SoC Development Kit and SoC Embedded Design Suite 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
    DK-DEV-5SGXEA7N Dev Kit
    DK-DEV-5SGXEA7N Dev Kit
    LTC Parts List
    DK-DEV-5SGXEA7N Block Diagram
    DK-DEV-5SGXEA7N Power Tree
    DK-DEV-5SGXEA7N Power Tree No TI
    Altera Stratix V GX 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
    DK-DEV-5CGTD9N Dev Kit
    DK-DEV-5CGTD9N Dev Kit
    DK-DEV-5CGTD9N Block Diagram
    DK-DEV-5CGTD9N Power Tree
    DK-DEV-5CGTD9N Power Tree No TI DDR Regulator
    Altera Cyclone V GT 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
    DK-SI-5SGTMC7N Signal Integrity Kit
    DK-SI-5SGTMC7N Signal Integrity Kit
    LTC Parts List
    DK-SI-5SGTMC7N Block Diagram
    DK-SI-5SGTMC7N Power Tree
    Altera Transceiver Signal Integrity Development Kit, Stratix V GT Edition 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
    Terasic DE2i-150 Cyclone IV Board
    Altera Arria V GX FPGA Development Kit
    Stratix V Advanced System Development Board
    Altera Arria V GT FPGA Development Kit
    Altera Cyclone V SoC Development Kit and SoC Embedded Design Suite
    Altera DSP Development Kit, Stratix V Edition
    Altera Transceiver Signal Integrity Kit, Stratix V GX Edition
    Altera Cyclone V GX Development Kit (Discontinued)
    Altera Arria V SoC Development Kit and SoC Embedded Design Suite
    Altera Stratix V GX FPGA Development Kit
    Altera Cyclone V GT FPGA Development Kit
    Altera Transceiver Signal Integrity Development Kit, Stratix V GT Edition

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