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ManufacturerLinear Technology

Dual 13A or Single 26A µModule (Power Module) Regulator with Digital Power System Management


  • Download » Datasheet PDF, 2.2 Mb, File uploaded: Sep 25, 2017
    LTM4676: Dual 13A or Single 26A µModule (Power Module) Regulator with Digital Power System Management Data Sheet
    Docket ↓
    Dual 13A or Single 26A
    ВµModule Regulator with Digital
    Power System Management
    Description Features Dual, Fast, Analog Loops with Digital Interface
Control and Monitoring
    n Wide Input Voltage Range: 4.5V to 26.5V
    n Output Voltage Range: 0.5V to 5.4V (4V on V
    n В±1% Maximum DC Output Error Over Temperature
    n В±2.5% Current Readback Accuracy at 10A Load
    n 400kHz PMBus-Compliant I2C Serial Interface
    n Integrated 16-Bit ∆Σ ADC
    n Constant Frequency Current Mode Control
    n Parallel and Current Share Multiple Modules
    n 16 Slave Addresses; Rail/Global Addressing
    n 16mm Г— 16mm Г— 5.01mm BGA Package
    Readable Data:
    n Input and Output Voltages, Currents, and Temperatures
    n Running Peak Values, Uptime, Faults and Warnings
    n Onboard EEPROM Fault Log Record
    Writable Data and Configurable Parameters:
    n Output Voltage, Voltage Sequencing and Margining ...



Package16mm x 16mm x 5.01mm BGA
Package Outline Drawing
Package CodeBGA
Package Index05-08-1920
Pin Count144


Demo BoardsDC2087A,DC1811B-KIT,DC2269A-A
Design ToolsLTpowerPlay ,LTspice File,LTpowerCAD File,Linduino File
Export Controlno
FeaturesBurst Mode, Differential Remote Sense, PolyPhase, PMBus, I2C Control, Watchdog Timer, EEPROM, ADC, DCR Current Sense, Sequencing, Margining, Tracking, External Synchronization
FunctionDC/DC uModule Regulator With Power System Management
Isupply, mA15
MonitorsVin, Iin, Vout, Iout, Temperature and Faults
Number of Outputs2
Operating Temperature Range, °C0 to 85
Supply Voltage Range4.5V to 26.5V
Vin Max, V26.5
Vin Min, V4.5

Eco Plan


Application Notes

  • Download » Application Notes - AN137 PDF, 540 Kb, File published: Sep 20, 2012
    Accurate Temperature Sensing with an External P-N Junction
    Many Linear Technology devices use an external PNP transistor to sense temperature. Common examples are LTC3880, LTC3883 and LTC2974. Accurate temperature sensing depends on proper PNP selection, layout, and device configuration. This application note reviews the theory of temperature sensing and gives practical advice on implementation.
    Docket ↓
    Application Note 137
    May 2012
    Accurate Temperature Sensing with an External P-N
    Michael Jones
    Introduction Temperature Sensing Theory Many Linear Technology devices use an external PNP
    transistor to sense temperature. Common examples are
    LTC3880, LTC3883 and LTC2974. Accurate temperature
    sensing depends on proper PNP selection, layout, and
    device configuration. This application note reviews the
    theory of temperature sensing and gives practical advice
    on implementation. Linear Technology devices use an external bipolar transistor p-n junction to measure temperature. The relationship
    between forward voltage, current, and temperature is: Why should you worry about implementing temperature
    sensing? Can’t you just put the sensor near your inductor
    and lay out your circuit any way you want? Unfortunately,
    poor routing can sacrifice temperature measurement
    performance and compensation. The purpose of this application note is to allow you the opportunity to get it right
    the first time, so you don’t have to change the layout after
    your board is fabricated.
    Why Use Temperature Sensing?
    Some Linear Technology devices measure internal and
    external temperature. Internal temperature is used to
    protect the device by shutting down operation or locking ...
  • Download » Application Notes - AN145 PDF, 3.0 Mb, File published: May 10, 2014
    Overview of the EEPROM in LTC PSM Devices
    Docket ↓
    Application Note 145
    July 2015
    Overview of the EEPROM in LTC PSM Devices
    Nick Vergunst Introduction convenient List Of All Options Linear TechnologyВ® has a large family of devices that
    provide a great deal of power and configurability for all
    applications. These parts additionally provide onboard
    nonvolatile memory (NVM) in the form of EEPROM to
    store and recall configuration parameters and on some
    devices provide a fault log and user scratch pad. Option 1A. Manual programming with LTpowerPlayв„ў
    Built In Programming Utility (PC->NVM) These Power System Management(PSM) devices’ architectures allow them to power up and load the desired
    configuration parameters from this NVM autonomously
    with no I2C or firmware interaction required.
    A common question customers ask is, “Now that I have
    settled on a particular configuration, how do I program
    this configuration into the chip’s onboard nonvolatile
    memory (NVM).”
    Some available options are presented in rough order of
    increasing complexity throughout the document.
    NOTE: Linear Technology strongly recommends
    Option 1 for preproduction prototyping, and
    OptionВ 2, Option 3 or Option 4 for higher volume
    production. Option 5 is a convenient method to
    program a small quantity of loose ICs prior to board ...
  • Download » Application Notes - AN152 PDF, 169 Kb, File published: Jul 12, 2016
    Power System Management Addressing
    Docket ↓
    Application Note 152
    July 2016
    Power System Management Addressing
    Michael Jones Introduction
    The foundation of all PMBus applications, including LTCВ®
    Power System Management (PSM), is the ability for the
    PMBus master (system host) to communicate with all
    PMBus slaves (PSM controllers, PSM managers, PSM
    ВµModulesВ®, and PMBus monolithic devices) on the bus.
    Every slave on the bus must have a unique address that
    does not conflict with other devices.
    The bus master must also be able to communicate with
    PSM slaves in a few less than obvious situations: Address discovery Global actions Multiphase rails Invalid NVM Bus MUXes
    Device addressing is achieved with a combination of base
    registers plus external address select (ASEL) pins, as well
    as special global, rail, ARA, and other special addresses.
    This Application Note will present the fundamental design
    principles underlying the LTC PSM family, details on product
    family differences, as well practical examples and advice.
    Special cases, such as invalid NVM, will also be discussed.
    The benefit to you is a design that works on day one, and
    works even when things go wrong. For example, if you
    are writing to the NVM with LTpowerPlayв„ў, and power is ...
  • Download » Application Notes - AN153 PDF, 1.3 Mb, File published: Feb 24, 2016
    Linduino for Power System Management
    Docket ↓
    Application Note 153
    July 2016
    Linduino for Power System Management
    Michael Jones
    INTRODUCTION LTC3880, and the industry standards for I2C/SMBus/
    PMBus. Most Power System Management designs follow a set
    and forget model. Setup and debug of Power System
    Management (PSM) devices is simple with LTpowerPlayВ®
    and when combined with a bulk programing solution, there
    is no need for firmware. However, many large systems
    require a Board Management Controller (BMC), begging
    the question: “What can firmware do for PSM?” Linduino PSM hardware consists of a Linduino (DC2026),
    and a shield to connect (DC2294) the I2C pins of the
    Linduino to an PMBus/SMBus/I2C Bus of a demo board
    or product board. The foundation of PSM firmware is PMBus; the foundation
    of PMBus is SMBus; and the foundation of SMBus is I2C.
    Building a BMC that adds value with PSM firmware requires
    some level of knowledge of each protocol, or a pre-existing
    library that frees the programmer from the details. For optimal learning, start with a DC2026 (Linduino),
    DC2294 (Shield), DC1962 (Power Stick), and a Total
    Phase Beagle (I2C Sniffer). This allows programming,
    debugging, and learning of controllers (LTC388X) and
    managers (LTC297X). The LinduinoВ® libraries handle each protocol layer, and ...
  • Download » Application Notes - AN155 PDF, 230 Kb, File published: Jan 26, 2017
    Fault Log Decoding with Linduino PSM
    Docket ↓
    Application Note 155
    January 2017
    Fault Log Decoding with Linduino PSM
    Michael Jones Introduction
    LTC power system management devices are PMBus controlled point-of-load converters (LTCВ®388X) and power
    system managers (LTC297X). All LTC power system management (PSM) devices have a fault log that is written
    to EEPROM when there is a fault. Once the fault log is
    written, fault logs are no longer generated until they are
    re-enabled, typically after the data has been read back.
    LTpowerPlayВ® helps debug a system by reading the fault
    log, decoding it into human-readable format, displaying it
    and saving it to a file. A system with a board management
    controller (BMC), can also read the fault log from EEPROM
    and re-enable it. Firmware can store, transfer over a
    network and decode fault data read from a PSM device.
    The LinduinoВ® Sketchbook contains an example sketch
    that reads fault logs, along with the supporting libraries
    for PMBus and fault log decoding.
    This application note describes the basics of reading and
    decoding fault logs using Linduino.
    The hardware used for this application note is:
    1. DC2026 (Linduino) ...
  • Download » Application Notes - AN166 PDF, 1.1 Mb, File published: Apr 10, 2017
    In Flight Update with Linduino
    Docket ↓
    Application Note 166
    April 2017
    In Flight Update with Linduino
    Michael Jones
    INTRODUCTION TO INFLIGHT UPDATE INFLIGHT UPDATE PROCESS Inflight Update is a method of modifying the stored settings of LTC Power System Management (PSM) devices,
    including application of the new settings, to a live system1 . The general dataflow of Infight Update is a simple linear
    progression: Inflight Update is a two-stage process: EEPROM is modified
    first, and then EEPROM is copied to RAM. During stage
    one, a Board Management Controller sends new settings
    directly to the EEPROM via PMBus while the devices are
    operating normally, without impacting operation. During
    stage two, all devices switch to the new configuration via
    a reset or a power cycle2 .
    Decoupling “programming settings” from “application of
    settings” allows the EEPROM programming mechanism
    to stage, validate, and recover from programming failure
    without interruption of delivered power. This minimizes
    system downtime because all rails are power cycled only
    once per update.
    Inflight Update solves several technical and business
    problems. Fast product development increases the probability of field problems. For example, the supervisors
    might require more margin to reduce false positives.
    An FPGA image update might require small changes to ...

Design Notes

  • Download » Design Notes - DN524 PDF, 337 Kb, File published: Jan 14, 2014
    Dual 13A ОјModule Regulator with Digital Interface for Remote Monitoring & Control of Power
    Docket ↓
    Dual 13A ОјModule Regulator with Digital Interface for
    Remote Monitoring & Control of Power
    Design Note 524
    Jian Li and Gina Le
    standard I2C-based digital serial interface protocol.
    The LTM4676 combines best-in-class analog switching regulator performance with precision mixed signal
    data acquisition. It features В±1% maximum DC output
    voltage error and В±2.5% current read back accuracy
    over temperature (TJ = –40ºC to 125ºC), and integrated
    16-bit delta-sigma ADC and EEPROM. Digital Power System Management:
    Set, Monitor, Change and Log Power
    Managing power and implementing flexibility in a high
    rail count circuit board can be challenging, requiring
    hands-on probing with digital voltmeters and oscilloscopes, and often rework of PCB components. To
    simplify power management, especially from a remote
    location, there is a trend to configure and monitor
    power via a digital communications bus. Digital power
    system management (PSM) enables on-demand telemetry capability to set, monitor, change and log
    power parameters. The LTM4676’s 2-wire serial interface allows outputs
    to be margined, tuned and ramped up and down at
    programmable slew rates with sequencing delay times.
    Input and output currents and voltages, output power,
    temperature, uptime and peak values are readable. ...


  • Download » Articles - LT Journal PDF, 3.2 Mb, File published: Aug 25, 2016
    Avoid Debugging Cycles in Power Management for FPGA, GPU and ASIC Systems
    Docket ↓
    Avoid Debugging Cycles in Power Management for FPGA,
    GPU and ASIC Systems
    Afshin Odabaee When it comes to designing FPGA, GPU or ASIC controlled systems, the number of
    design challenges related to power management and analog systems pale in comparison
    to those related to digital design. Nevertheless, it is risky to assume that power system
    design can be left to “later,” or taken in line with digital design. Even seemingly innocuous
    problems in power supply design can significantly delay the release of a system, as any
    added time to the power system debugging cycle can halt all work on the digital side.
    A good way to put DC/DC regulation
    issues to rest is to use a verified development kit offered by the FPGA, GPU or
    ASIC vendor. Often, the design itself or
    a similar design is available as a board/
    kit by the suppliers of power products
    and FPGA, GPU and ASIC manufacturers. Using a tested and verified kit unburdens
    system designers of most power system
    and analog issues, allowing them instead
    to focus their energies on configuring the
    complex digital systems. The optimum
    power system layout is taken care of
    before significant design is undertaken. THOUGHTFUL POWER MANAGEMENT
    IS CHALLENGING AT THE START Every design task is initially daunting,
    and power management design is no
    exception. This is the case when power is ...

Moldel Line

Series: LTM4676 (1)

Manufacturer's Classification

  • µModule Solutions > µModule Regulators > µModule Buck Regulators
  • Monitor, Control and Protection > Digital Power System Management > DC/DC uModule With Power System Management
  • Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck
  • Power Management > Switching Regulator > Digitally Programmable Regulators

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