LTC3887
LTC3887-1
LTC3887-2
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3887
LTC3887-1
LTC3887-2

Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 24
1ku List Price Starting From $6.44
Features
  • PMBus/I2C Compliant Serial Interface
    • Telemetry Read Back includes VIN, IIN, VOUT, IOUT, Temperature, Duty Cycle and Faults
    • Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV and Frequency Synchronization (250kHz to 1MHz)
  • ±0.5% Output Voltage Accuracy Over Temperature
  • Integrated 16-Bit ADC
  • VOUT Range: 0.5V to 5.5V (VOUT0, VOUT1)
  • Internal EEPROM and Fault Logging with ECC
  • Integrated N-Channel MOSFET Gate Drivers (LTC3887)
  • Minimum On-Time 45ns
  • Wide VIN Range: 4.5V to 24V
  • Analog Current Mode Control Loop
  • Remote Differential Sense for PolyPhase® Applications
  • Accurate PolyPhase Current Sharing for Up to Six Phases
  • Available in a 40-Pin (6mm × 6mm) QFN Package
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LTC3887/LTC3887-1/LTC3887-2 are dual, PolyPhase DC/DC synchronous step-down switching regulator controllers with an I2C-based PMBus compliant serial interface. The controllers use a constant frequency, current mode architecture that is supported by LTpowerPlay® a software development tool with graphical user interface (GUI).

Switching frequency, channel phasing, output voltage, and device address can be programmed using external configuration resistors. Additionally, parameters can be set via the digital interface or stored in EEPROM. Voltage, current, internal/external temperature and fault status can be read back through the bus interface.

The LTC3887 has integrated gate drivers. The LTC3887-1 has three-state PWM pins to drive DrMOS power stages. The LTC3887-2 has gate drivers and no LDO and supports VIN up to 34V. The LTC3887 is an enhanced version of the LTC3880 with greater output voltage range and more digital features.

Applications

  • High Current Distributed Power Systems
  • Telecom, Datacom and Storage Systems
  • Intelligent Energy Efficient Power Regulation
Part Models 24
1ku List Price Starting From $6.44

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 6

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DC2454A

LTC3887EUJ-1/LTC3870EUF-1 Demo Board | Dual Phase PMBus Buck Controller with Slave Controller, 7V ≤ VIN ≤ 14V, 0.8V ≤ VOUT ≤ 1.8V @ 100A

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DC2454A

LTC3887EUJ-1/LTC3870EUF-1 Demo Board | Dual Phase PMBus Buck Controller with Slave Controller, 7V ≤ VIN ≤ 14V, 0.8V ≤ VOUT ≤ 1.8V @ 100A

LTC3887EUJ-1/LTC3870EUF-1 Demo Board | Dual Phase PMBus Buck Controller with Slave Controller, 7V ≤ VIN ≤ 14V, 0.8V ≤ VOUT ≤ 1.8V @ 100A

Product Detail

Demonstration circuit 2454A is a high current, high efficiency, poly-phase synchronous buck converter featuring the LTC3887EUJ-1, a dual-phase current mode controller, and the LTC3870EUF-1, a dual-phase slave controller. The LTC3887-1 has the PMBus interface and the power system management functions.


 


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DC2394A

LTC3887EUJ-1 Demo Board (DCR Sense) | PMBus Buck with DrMOS, 7V ≤ VIN ≤ 14V, VOUT0/VOUT1 = 0.8V to 1.8V @ 30A

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DC2394A

LTC3887EUJ-1 Demo Board (DCR Sense) | PMBus Buck with DrMOS, 7V ≤ VIN ≤ 14V, VOUT0/VOUT1 = 0.8V to 1.8V @ 30A

LTC3887EUJ-1 Demo Board (DCR Sense) | PMBus Buck with DrMOS, 7V ≤ VIN ≤ 14V, VOUT0/VOUT1 = 0.8V to 1.8V @ 30A

Product Detail

Demonstration circuit 2394A is a high current, high efficiency, dual output PolyPhase® synchronous buck converter featuring the LTC3887EUJ-1, a dual-phase current mode controller. The LTC3887-1 has the PMBus interface and the power system management functions.

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DC2578A

Total Power Management: Hot Swap, Intermediate Bus Voltage, Point-of-Load (Featuring LTC4281, LTC3886, LTC3887, LTC2975) [Requires DC1613]

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DC2578A

Total Power Management: Hot Swap, Intermediate Bus Voltage, Point-of-Load (Featuring LTC4281, LTC3886, LTC3887, LTC2975) [Requires DC1613]

Total Power Management: Hot Swap, Intermediate Bus Voltage, Point-of-Load (Featuring LTC4281, LTC3886, LTC3887, LTC2975) [Requires DC1613]

Product Detail

The DC2578A is a complete power chain, including a hot swap controller, an intermediate bus controller, and six point-of-load channels with power system management. The board demonstrates how to safely transfer power from a backplane, through an LTC4281 hot swap controller, through an LTC3886 step-down intermediate bus controller (IBC), and out through the point-of-load converters (POLs) that regulate load voltages. It shows the comprehensive set of power management, cooperation, and safety features of the Analog Devices solution, and showcases how easy it is to configure and manage the whole power hierarchy. Each regulated supply has the ability to sequence, trim, margin, supervise, measure, respond cooperatively to faults, and log fault information in nonvolatile memory. In addition, the onboard load pulser helps with optimizing the adjustable LTC3886 control loop response. The rich set of status and telemetry information provided by the entire system is consolidated and presented under one GUI interface — LTpowerPlay.

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DC1709A

LTC3880/-1 & LTC3887/-1 Demo Board I Programming Clamshell Socketed Demo Board

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DC2263A-A

LTC3887EUJ Demo Board (RSENSE) | Dual PMBus Buck, 7V ≤ VIN ≤ 18V, VOUT0/VOUT1 = 0.8V to 1.8V @ 25A

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DC2263A-A

LTC3887EUJ Demo Board (RSENSE) | Dual PMBus Buck, 7V ≤ VIN ≤ 18V, VOUT0/VOUT1 = 0.8V to 1.8V @ 25A

LTC3887EUJ Demo Board (RSENSE) | Dual PMBus Buck, 7V ≤ VIN ≤ 18V, VOUT0/VOUT1 = 0.8V to 1.8V @ 25A

Product Detail

Demonstration circuit 2263A is a high current, high efficiency, dual output/polyphase synchronous buck converter featuring the LTC3887EUJ, a dual-phase current mode controller. The LTC3887 has the PMBus interface and the power system management functions. The DC2263A uses discrete MOSFETs in the power stage. The input range of this board is from 7V to 14V. The output voltage can be programmed from 0.8V to 1.8V (1.0V default) with an output current up to 25A per phase. The DC2263A has two versions: The DC2263A-A uses a sense resistor and provides two outputs while the DC2263A-B uses DCR current sensing and provides a dual-phase single output. 

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DC2263A-B

LTC3887EUJ Demo Board (DCR SENSE) | 2 Phase PMBus Buck, 7V ≤ VIN ≤ 18V, VOUT = 0.8V to 1.8V @ 50A

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DC2263A-B

LTC3887EUJ Demo Board (DCR SENSE) | 2 Phase PMBus Buck, 7V ≤ VIN ≤ 18V, VOUT = 0.8V to 1.8V @ 50A

LTC3887EUJ Demo Board (DCR SENSE) | 2 Phase PMBus Buck, 7V ≤ VIN ≤ 18V, VOUT = 0.8V to 1.8V @ 50A

Product Detail

Demonstration circuit 2263A is a high current, high efficiency, dual output/polyphase synchronous buck converter featuring the LTC3887EUJ, a dual-phase current mode controller. The LTC3887 has the PMBus interface and the power system management functions. The DC2263A uses discrete MOSFETs in the power stage. The input range of this board is from 7V to 14V. The output voltage can be programmed from 0.8V to 1.8V (1.0V default) with an output current up to 25A per phase. The DC2263A has two versions: The DC2263A-A uses a sense resistor and provides two outputs while the DC2263A-B uses DCR current sensing and provides a dual-phase single output.

Tools & Simulations

Tools & Simulations 5

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

Linduino

Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.

Linduino code repository on GitHub and instructions on how to use the code.

Purchase Linduino

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Reference Designs

Reference Designs 4

AI XCXM1902 Minimum Rails and PL Performance

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AI XCXM1902 Minimum Rails and PL Performance

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Circuits from the lab

tooltip Info:Circuits from the lab
AI XCXM1902 Minimum Rails and PL Performance

Features and Benefits

ADI Key Power Management Features for Versal PRIME XCXM1802 for Minimum Rails / PL Performance

  • Proposed Solution implements new LTC3887-1/LTC7051 combo
  • LTC3887-1 is a PMBus 2-phase, 2 loop, current mode controller. PMBus commands allow Vin, Vout, current, temperature, and fault status read back.
  • LTC7051 is new Silent Switcher 2 ADI MOS capable of delivering increased DC load while switching at higher frequencies. Increased DC load allows for decreased phase count and higher current density. Increased Fsw allows for increase bandwidth and excellent transient response.
  • LTC3636 is dual 6A, controlled on-time current mode monolithic (integrated FETs). Provides high performance compact solution for auxiliary rails.
  • LT8607 is a compact, high efficiency, high speed 750mA synchronous monolithic.
  • LTC3634 is a single chip solution for DDR rails providing VDD, VTT, and Vref in a monolithic solution.
View Detailed Reference Design external link

AI XCXM1802 for Optimized Efficiency

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ai-xcxm1802-optimized-efficiency

AI XCXM1802 for Optimized Efficiency

ai-xcxm1802-optimized-efficiency

Circuits from the lab

tooltip Info:Circuits from the lab
AI XCXM1802 for Optimized Efficiency

Features and Benefits

ADI Key Power Management Features for Versal ACAP XCXM1802 for Optimized Efficiency

  • Proposed Solution implements new LTC3887-1/LTC7051 combo
  • LTC3887-1 is a PMBus 2-phase, 2 loop, current mode controller. PMBus commands allow Vin, Vout, current, temperature, and fault status read back.
  • LTC7051 is new Silent Switcher 2 ADI MOS capable of delivering increased DC load while switching at higher frequencies. Increased DC load allows for decreased phase count and higher current density. Increased Fsw allows for increase bandwidth and excellent transient response.
  • LTC3636 is dual 6A, controlled on-time current mode monolithic (integrated FETs). Provides high performance compact solution for auxiliary rails.
  • LTC3634 is a single chip solution for DDR rails providing VDD, VTT, and Vref in a monolithic solution.
  • LTC3634 is a single chip solution for DDR rails providing VDD, VTT, and Vref in a monolithic solution.
View Detailed Reference Design external link

AI XCXM1802 for Full Management Mid to High Voltage

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ai-xcxm1802-full-management-mid-high-voltage

AI XCXM1802 for Full Management Mid to High Voltage

ai-xcxm1802-full-management-mid-high-voltage

Circuits from the lab

tooltip Info:Circuits from the lab
AI XCXM1802 for Full Management Mid to High Voltage

Features and Benefits

ADI Key Power Management Features for Versal ACAP XCXM1802 for Mid to High Voltage

  • Proposed Solution implements new LTC3887-1/LTC7051 combo
  • LTC3887-1 is a PMBus 2-phase, 2 loop, current mode controller. PMBus commands allow Vin, Vout, current, temperature, and fault status read back.
  • LTC7051 is new Silent Switcher 2 ADI MOS capable of delivering increased DC load while switching at higher frequencies. Increased DC load allows for decreased phase count and higher current density. Increased Fsw allows for increase bandwidth and excellent transient response.
  • LTC3636 is dual 6A, controlled on-time current mode monolithic (integrated FETs). Provides high performance compact solution for auxiliary rails.
  • LTC3644 is a quad 1.25A output, high efficiency synchronous monolithic capable of switching up to 2.25MHz.
  • LTC3634 is a single chip solution for DDR rails providing VDD, VTT, and Vref in a monolithic solution.
View Detailed Reference Design external link
XCXM1802 Low Voltage

AI XCXM1802 for Low Voltage

zoomopens a dialog

ai-xcxm1802-low-voltage

AI XCXM1802 for Low Voltage

ai-xcxm1802-low-voltage

Circuits from the lab

tooltip Info:Circuits from the lab
AI XCXM1802 for Low Voltage

Features and Benefits

ADI Key Power Management Features for Versal PRIME XCXM1802 for Low Voltage

  • Proposed Solution implements new LTC3887-1/LTC7051 combo
  • LTC3887-1 is a PMBus 2-phase, 2 loop, current mode controller. PMBus commands allow Vin, Vout, current, temperature, and fault status read back.
  • LTC7051 is new Silent Switcher 2 ADI MOS capable of delivering increased DC load while switching at higher frequencies. Increased DC load allows for decreased phase count and higher current density. Increased Fsw allows for increase bandwidth and excellent transient response.
  • LTC3636 is dual 6A, controlled on-time current mode monolithic (integrated FETs). Provides high performance compact solution for auxiliary rails.
  • LTC3644 is a quad 1.25A output, high efficiency synchronous monolithic capable of switching up to 2.25MHz.
  • LTC3634 is a single chip solution for DDR rails providing VDD, VTT, and Vref in a monolithic solution.
View Detailed Reference Design external link

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