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ManufacturerLinear Technology
SeriesLTC3882

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

Datasheets

  • Download » Datasheet PDF, 1.4 Mb, File uploaded: Mar 27, 2018
    LTC3882: Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management Data Sheet
    Docket ↓
    LTC3882
    Dual Output PolyPhase
    Step-Down DC/DC Voltage Mode Controller
    with Digital Power System Management
    DESCRIPTION FEATURES PMBus/I2C Compliant Serial Interface
    nn Monitor Voltage, Current, Temperature and Faults
    nn Digitally Programmable Voltage, Current Limit,
    Soft-Start/Stop, Sequencing, Margining, AVP and
    UV/OV Thresholds
    nn 3V ≤ VINSNS ≤ 38V, 0.5V ≤ V
    OUT ≤ 5.25V
    nn ±0.5% Output Voltage Accuracy
    nn Programmable PWM Frequency or External Clock
    Synchronization from 250kHz to 1.25MHz
    nn Accurate PolyPhase® Current Sharing
    nn Internal EEPROM with Fault Logging and ECC
    nn IC Supply Range: 3V to 13.2V
    nn Resistor or Inductor DCR Current Sensing
    nn Optional Resistor Programming for Key Parameters
    nn 40-Pin (6mm × 6mm) QFN Package
    nn APPLICATIONS
    High Current Distributed Power Systems
    Servers, Network and Storage Equipment ...

Prices

Packaging

Parametrics

LTC3882EUJ#PBFLTC3882EUJ#TRPBFLTC3882IUJ#PBFLTC3882IUJ#TRPBF
ADC16-Bit16-Bit16-Bit16-Bit
DAC12-Bit12-Bit12-Bit12-Bit
Demo BoardsDC1936A,DC2174A-A,DC2174A-B,DC2252A-A,DC2291ADC1936A,DC2174A-A,DC2174A-B,DC2252A-A,DC2291ADC1936A,DC2174A-A,DC2174A-B,DC2252A-A,DC2291ADC1936A,DC2174A-A,DC2174A-B,DC2252A-A,DC2291A
Design ToolsLTspice Model,LTpowerCAD File,Linduino FileLTspice Model,LTpowerCAD File,Linduino FileLTspice Model,LTpowerCAD File,Linduino FileLTspice Model,LTpowerCAD File,Linduino File
Export Controlnononono
FeaturesBurst Mode, Differential Remote Sense, PolyPhase, PMBus, I2C Control, EEPROM, ADC, DCR Current Sense, Sequencing, Margining, Tracking, External SynchronizationBurst Mode, Differential Remote Sense, PolyPhase, PMBus, I2C Control, EEPROM, ADC, DCR Current Sense, Sequencing, Margining, Tracking, External SynchronizationBurst Mode, Differential Remote Sense, PolyPhase, PMBus, I2C Control, EEPROM, ADC, DCR Current Sense, Sequencing, Margining, Tracking, External SynchronizationBurst Mode, Differential Remote Sense, PolyPhase, PMBus, I2C Control, EEPROM, ADC, DCR Current Sense, Sequencing, Margining, Tracking, External Synchronization
FunctionDC/DC Regulator With Power System ManagementDC/DC Regulator With Power System ManagementDC/DC Regulator With Power System ManagementDC/DC Regulator With Power System Management
I/OPMBus/SMBus/I2CPMBus/SMBus/I2CPMBus/SMBus/I2CPMBus/SMBus/I2C
Isupply, mA32323232
MonitorsVin, Iin, Vout, Iout, Temperature and FaultsVin, Iin, Vout, Iout, Temperature and FaultsVin, Iin, Vout, Iout, Temperature and FaultsVin, Iin, Vout, Iout, Temperature and Faults
Number of Outputs2222
Operating Temperature Range, °C0 to 850 to 85-40 to 85-40 to 85
Supply Voltage Range3V to 13.2V3V to 13.2V3V to 13.2V3V to 13.2V
Vin Max, V13.213.213.213.2
Vin Min, V3333

Eco Plan

LTC3882EUJ#PBFLTC3882EUJ#TRPBFLTC3882IUJ#PBFLTC3882IUJ#TRPBF
RoHSCompliantCompliantCompliantCompliant

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
    Junction
    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 Technology® 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 LTpowerPlay™
    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
    Option 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 - AN149 PDF, 1.4 Mb, File published: Mar 23, 2015
    Modeling and Loop Compensation Design of Switching Mode Power Supplies
    Docket ↓
    Application Note 149
    January 2015
    Modeling and Loop Compensation Design of
    Switching Mode Power Supplies
    Henry J. Zhang
    Introduction Identifying The Problem Today’s electronic systems are becoming more and more
    complex, with an increasing number of power rails and
    supplies. To achieve optimum power solution density,
    reliability and cost, often system designers need to design
    their own power solutions, instead of just using commercial power supply bricks. Designing and optimizing high
    performance switching mode power supplies is becoming
    a more frequent and challenging task. A well-designed switching mode power supply (SMPS)
    must be quiet, both electrically and acoustically. An undercompensated system may result in unstable operations.
    Typical symptoms of an unstable power supply include:
    audible noise from the magnetic components or ceramic
    capacitors, jittering in the switching waveforms, oscillation
    of output voltage, overheating of power FETs and so on. Power supply loop compensation design is usually
    viewed as a difficult task, especially for inexperienced
    supply designers. Practical compensation design typically
    involves numerous iterations on the value adjustment
    of the compensation components. This is not only time
    consuming, but is also inaccurate in a complicated
    system whose supply bandwidth and stability margin ...
  • 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 LTC®
    Power System Management (PSM), is the ability for the
    PMBus master (system host) to communicate with all
    PMBus slaves (PSM controllers, PSM managers, PSM
    µModules®, 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 LTpowerPlay™, 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 LTpowerPlay®
    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 Linduino® 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 (LTC®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.
    LTpowerPlay® 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 Linduino® 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.
    Hardware
    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 ...

Articles

  • Download » Articles - LT Journal PDF, 406 Kb, File published: Oct 27, 2014
    High Step-Down Ratio Controller Combines Digital Power System Management with Sub-Milliohm DCR Sensing and Accurate PolyPhase Load Sharing
    Docket ↓
    High Step-Down Ratio Controller Combines Digital Power
    System Management with Sub-Milliohm DCR Sensing and
    Accurate PolyPhase Load Sharing
    James A. McKenzie The increasing complexity of electronics, particularly large computing systems, has
    exerted pressure on power supplies to improve efficiency, transient response, monitoring
    and reporting functionality, and digital control. High efficiency is paramount in distributed
    systems, where high step-down ratios from intermediate voltage busses are used to
    create local low voltage supplies sourcing high currents. Sensitive low voltage subsystems
    require accurate output voltage regulation single-cycle load step response. Such needs are
    frequently met with PolyPhase® designs located in close proximity to their point of load. VIN
    7V TO 14V

    330µF
    ×2 + VDD33
    10k
    4.99k 10k 10k 4.99k 10k VDD25 2.2µF
    4.99k 5 100nF
    VCC
    1µF
    VDD33 VDD25
    SDA
    ALERT
    GPIO0 SYNC 17.4k PGND FB0 SHARE_CLK 16.2k 100pF ...

Moldel Line

Series: LTC3882 (4)

Manufacturer's Classification

  • Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck | External Power Switch Buck Controllers
  • Power Management > Switching Regulator > Digitally Programmable Regulators
  • Monitor, Control and Protection > Digital Power System Management > DC/DC Regulator With Power System Management

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