LTC3887
LTC3887-1
LTC3887-2

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

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Recommended for New Designs

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Alternative Parts

LTC3880

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

LTC3882

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

Features and Benefits

PMBus/I²C Compliant Serial Interface
- Telemetry Read Back includes V_IN, I_IN, V_OUT, I_OUT, 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
V_OUT Range: 0.5V to 5.5V (V_OUT0, V_OUT1)
Internal EEPROM and Fault Logging with ECC

Integrated N-Channel MOSFET Gate Drivers (LTC3887)
Minimum On-Time 45ns
Wide V_IN 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

Product Details

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 V_IN 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

Product Categories

Power Management

Power Monitor, Control, and Protection
- Buck Regulators with Digital Power System Management

Comparable Parts Click to see all in Parametric Search

Product Lifecycle 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 (6)

DC2578A

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

DC2394A

LTC3887EUJ-1 Demo Board (DCR Sense) | PMBus Buck with DrMOS, 7V ≤ V_IN ≤ 14V, V_OUT0/V_OUT1 = 0.8V to 1.8V @ 30A

DC2454A

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

DC2263A-B

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

DC2263A-A

LTC3887EUJ Demo Board (R_SENSE) | Dual PMBus Buck, 7V ≤ V_IN ≤ 18V, V_OUT0/V_OUT1 = 0.8V to 1.8V @ 25A

DC1709A

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

DC2578A

View Detailed Evaluation Kit Information

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.

Resources

DC2263A-B

View Detailed Evaluation Kit Information

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.

Resources

DC2263A-A

View Detailed Evaluation Kit Information

Resources

Documentation & Resources

Data Sheets

LTC3887/LTC3887-1/LTC3887-2: Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management Data Sheet (Rev. F)
5/3/2017

PDF

2 M

Reliability Data

R526 Reliability Data
3/26/2018

PDF

365 K

Application Notes

AN168 - Implementing Fast Telemetry with Power System Management Controllers
2/8/2018

PDF

161K
AN-166: In Flight Update with Linduino
4/10/2017

PDF

1M
AN-155: Fault Log Decoding with Linduino PSM
1/26/2017

PDF

224K
AN-153: Linduino for Power System Management
12/5/2016

PDF

1M
AN-152: Power System Management Addressing (Rev. A)
7/12/2016

PDF

164K
AN-145: Overview of the EEPROM in LTC PSM Devices
7/20/2015

PDF

2M
AN-137: Accurate Temperature Sensing with an External P-N Junction
9/20/2012

PDF

527K

User Guides

DC2578A - Demo Board Manual
1/18/2018

PDF

2M
DC2454A - Demo Manual
12/19/2016

PDF

1M
DC2263A - Demo Manual
2/3/2016

PDF

1M
DC2394A - Demo Manual
1/22/2016

PDF

693K
DC1709A - Demo Manual
3/20/2013

PDF

1M

Product Information

LTC3880 to LTC3887 - Migration Guide
9/4/2015

PDF

104K

Spec Notice

Product Errata - LTC3887
3/16/2015

PDF

166K

Product Selector Card

Digital Power System Management
4/4/2017

PDF

1M

Press Releases

Technical Articles

Care and Feeding of FPGA Power Supplies: A How and Why Guide to Success
11/1/2018 Analog Dialogue
AN168 - Implementing Fast Telemetry with Power System Management Controllers
2/8/2018

Tools & Simulations

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.

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.

LTspice downloads and documentation

LTspice Simulations

LTC3887 Demo Circuit - High Efficiency Dual 500kHz 3.3V/1.8V Step-Down Converter (6-24V to 3.3V & 1.8V @ 15A)

Models for the following parts are available in LTspice:

LTC3887

LTC3887-1

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.

To open the project file for this circuit:

Step 1: Download and install LTpowerCAD on your computer.

Step 2: Click on the link(s) in the section below to download part-specific project files.

Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.

LTpowerCAD download and documentation

LTpowerCAD Project Files

LTC3887 Project - Dual Output PolyPhase Step-Down DC/DC Controller with Inductor DCR Current Sensing (7-14V to 1V & 1.8V @ 25A)

LTC3887 Project - Dual Output PolyPhase Step-Down DC/DC Controller with Rsense Current Sensing (7-14V to 1V & 1.8V @ 25A)

LTC3887 Project - Dual Output PolyPhase Step-Down DC/DC Controller with Inductor DCR Current Sensing (7-14V to 1V @ 50A)

Design tools for the following parts are available in LTpowerCAD:

LTC3887

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

Linduino download and documentation

Code Files

LTC3887 - Linduino CPP File

LTC3887 - Linduino Header File

LTC3887 - DC2263A.ino

Design Tools

LTpowerPlay^®

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

Reference Designs (4)

Versal PRIME

AI XCXM1902 Minimum Rails and PL Performance

Versal PRIME

AI XCXM1802 for Optimized Efficiency

Versal PRIME

AI XCXM1802 for Full Management Mid to High Voltage

Versal PRIME

AI XCXM1802 for Low Voltage

Versal PRIME

AI XCXM1902 Minimum Rails and PL Performance

Versal PRIME

AI XCXM1902 Minimum Rails and PL Performance

View Detailed Reference Design Information

Features & 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.

Parts Used

Versal PRIME

AI XCXM1802 for Optimized Efficiency

Versal PRIME

AI XCXM1802 for Optimized Efficiency

View Detailed Reference Design Information

Features & 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.

Parts Used

Versal PRIME

AI XCXM1802 for Full Management Mid to High Voltage

Versal PRIME

AI XCXM1802 for Full Management Mid to High Voltage

View Detailed Reference Design Information

Features & 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.

Parts Used

Versal PRIME

AI XCXM1802 for Low Voltage

Versal PRIME

AI XCXM1802 for Low Voltage

View Detailed Reference Design Information

Features & 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.

Parts Used

Product Recommendations

LTC3887 Companion Parts

Recommended Related Parts

LTC2975, LTC3870-1.

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.

Quality And Reliability

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Request Product/Process Change Notifications

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Support & Discussions

LTC3887 Discussions

RE: DC2595A (LTC3889) on LTSketchbook library

RE: change LTC 3887 settings and program to EEPROM issue

All LTC3887 Discussions

Contact ADI Technical Support »

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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.