LTC3882 - Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

Features

  • Order Custom Programmed Parts
  • PMBus/I2C Compliant Serial Interface
    – Monitor Voltage, Current, Temperature and Faults
    – Digitally Programmable Voltage, Current Limit, Soft-Start/Stop, Sequencing, Margining, AVP and UV/OV Thresholds
  • 3V ≤ VINSNS ≤ 38V, 0.5V ≤ VOUT ≤ 5.25V
  • ±0.5% Output Voltage Accuracy
  • Programmable PWM Frequency or External Clock Synchronization from 250kHz to 1.25MHz
  • Accurate PolyPhase® Current Sharing
  • Internal EEPROM with Fault Logging
  • IC Supply Range: 3V to 13.2V
  • Resistor or Inductor DCR Current Sensing
  • Optional Resistor Programming for Key Parameters
  • 40-Pin (6mm × 6mm) QFN Package

Typical Application

LTC3882 Typical Application
LTC3882 Typical Application

Description

The LTC®3882 is a dual, PolyPhase DC/DC synchronous step-down switching regulator controller with PMBus compliant serial interface. It uses a constant frequency, leading-edge modulation, voltage mode architecture for excellent transient response and output regulation. Each PWM channel can produce output voltages from 0.5V to 5.25V using a wide range of 3.3V compatible power stages, including power blocks, DrMOS or discrete FET drivers. Up to four LTC3882s can operate in parallel for 2-, 3-, 4-, 6- or 8-phase operation.

LTC3882 system configuration and monitoring is supported by the LTpowerPlay™ software tool. The device’s serial interface can be used to read back input voltage, output voltage and current, temperature and fault status. A wide range of operating parameters can be set via the digital interface or stored in internal EEPROM for use at power up. Switching frequency and phase, output voltage and device address can also be programmed using external configuration resistors.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

6x6 QFN-40

LTC3882 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3882EUJ#PBF QFN 40 E $7.64 $5.35 View
LTC3882EUJ#TRPBF QFN 40 E $5.41 View
LTC3882IUJ#PBF QFN 40 I $8.86 $6.20 View
LTC3882IUJ#TRPBF QFN 40 I $6.26 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1936A LTC3882EUJ Demo Board | Dual Buck Voltage Mode Controller with PSM, 7V ≤ VIN ≤ 14V; 0.8V ≤ VOUT0 ≤ 1.8V @ 30A, 0.8V ≤ VOUT1 ≤ 1.8V @ 30A Contact Factory
DC2174A-A LTC3882EUJ Demo Board | Dual Phase, Dual Output PMBus Buck, 7V ≤ VIN ≤ 14V; 0.5V ≤ VOUT0 ≤ 2V @ 35A, 0.5V ≤ VOUT1 ≤ 2V @ 35A Contact Factory
DC2174A-B LTC3882EUJ Demo Board | Dual Phase, Single Output PMBus Buck, 7V ≤ VIN ≤ 14V; 0.5V ≤ VOUT0 ≤ 2V @ 70A Contact Factory
DC2252A-A LTC3882EUJ Demo Board | EEPROM Programming Board for LTC3882 Contact Factory
Buy Now

Companion Boards

Part Number Description Price Documentation
DC1613A USB-to-PMBus Controller $50.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • High Current Distributed Power Systems
  • Servers, Network and Storage Equipment
  • Intelligent Energy Efficient Power Regulation
  • Industrial/Telecom/ATE Systems

Product Notifications

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Design Tools

Linduino

Linduino is an Arduino compatible platform for developing and distributing firmware libraries and code for SPI and I²C-compatible integrated circuits. The Linduino One board interfaces to more than 300 QuikEval demonstration cards, supporting a variety of product types including analog-to-digital converters (ADCs)digital-to-analog converters (DACs)power monitors, and more. Firmware libraries for individual devices are written in C and designed to be portable to a wide variety of processors and microcontrollers. Each library has a demonstration program that can be uploaded to the Linduino One platform to allow the circuit and software to be quickly and easily verified.

Click here for more information on Linduino

LTspiceIV

LTspice® IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

Models for the following parts are available in LTspice IV:
LTC3882

Code

Linduino is Linear Technology's Arduino compatible system for developing and distributing firmware libraries and example code for Linear Technology’s integrated circuits. The code below can be downloaded or copied and pasted into your project. Please visit the Linduino Home Page for demo board, manual and setup information.

This part is Code Supported: There is example code available for this part. The code below may rely on other drivers available in the full library.

Download LTC3882 - DC1936A Linduino .INO File

/*
Linear Technology DC1936A Demonstration Board
LTC3882: Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

@verbatim

NOTES
  Setup:
   Set the terminal baud rate to 115200 and select the newline terminator.

@endverbatim
 
http://www.linear.com/product/LTC3882
http://www.linear.com/demo/DC1936A

REVISION HISTORY
$Revision: 3214 $
$Date: 2015-03-03 09:54:52 -0800 (Tue, 03 Mar 2015) $

Copyright (c) 2014, Linear Technology Corp.(LTC)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The views and conclusions contained in the software and documentation are those
of the authors and should not be interpreted as representing official policies,
either expressed or implied, of Linear Technology Corp.

The Linear Technology Linduino is not affiliated with the official Arduino team.
However, the Linduino is only possible because of the Arduino team's commitment 
to the open-source community.  Please, visit http://www.arduino.cc and 
http://store.arduino.cc , and consider a purchase that will help fund their 
ongoing work.
*/

#include 
#include 
#include "Linduino.h"
#include "UserInterface.h"
#include "LT_I2CBus.h"
#include "LT_SMBusNoPec.h"
#include "LT_SMBusPec.h"
#include "LT_PMBus.h"

#define LTC3882_I2C_ADDRESS 0x5C

// Global variables
static uint8_t ltc3882_i2c_address;
static LT_SMBus *smbus = new LT_SMBusPec();
static LT_PMBus *pmbus = new LT_PMBus(smbus);

//! Initialize Linduino
void setup()
{
  Serial.begin(115200);         //! Initialize the serial port to the PC
  print_title();
  ltc3882_i2c_address = LTC3882_I2C_ADDRESS;
  print_prompt();
}

//! Repeats Linduino loop
void loop()
{
  uint8_t user_command;
  uint8_t res;
  uint8_t model[7];
  uint8_t *addresses = NULL;
  
  if (Serial.available())                          //! Checks for user input
  {
    user_command = read_int();                     //! Reads the user command
    if (user_command != 'm')
  	Serial.println(user_command);
  
    switch (user_command)                          //! Prints the appropriate submenu
    {
  	case 1:
  	  menu_1_basic_commands();                 // Print single-ended voltage menu
  	  break;
  	case 2:
  	  pmbus->readModel(ltc3882_i2c_address, model);
  	  Serial.print(F("MODEL "));
  	  Serial.print((char*)model);
  	  Serial.println();
  	  break;
  	case 3:
  	  res = pmbus->readPmbusRevision(ltc3882_i2c_address);
  	  Serial.print(F("REVISION "));
  	  Serial.println(res, HEX);    
  	  break;
  	case 4:
  	  pmbus->enablePec(ltc3882_i2c_address); 
          delete smbus;
          delete pmbus;
  	  smbus = new LT_SMBusPec();
  	  pmbus = new LT_PMBus(smbus);
  	  break;
  	case 5:
  	  pmbus->disablePec(ltc3882_i2c_address);    
          delete smbus;
          delete pmbus;
  	  smbus = new LT_SMBusNoPec();
  	  pmbus = new LT_PMBus(smbus);
  	  break;
  	case 6:
  	  addresses = smbus->probe(0);
  	  while(*addresses != 0)
  	  {
  		Serial.print(F("ADDR 0x"));
  		Serial.println(*addresses++, HEX);
  	  }
  	  break;
  	case 7 :
  	  pmbus->resetGlobal();
  	  break;
  	default:
  	  Serial.println(F("Incorrect Option"));
  	  break;
    }
    print_prompt();
  }

}

// Function Definitions

//! Prints the title block when program first starts.
void print_title()
{
  Serial.print(F("\n*****************************************************************\n"));
  Serial.print(F("* DC1936A Demonstration Program                                 *\n"));
  Serial.print(F("*                                                               *\n"));
  Serial.print(F("* This program demonstrates how to send and receive data from   *\n"));
  Serial.print(F("* the DC1936A demo board.                                       *\n"));
  Serial.print(F("*                                                               *\n"));
  Serial.print(F("* Set the baud rate to 115200 and select the newline terminator.*\n"));
  Serial.print(F("*                                                               *\n"));
  Serial.print(F("*****************************************************************\n"));
}

//! Prints main menu.
void print_prompt()
{
  Serial.print(F("\n  1-Basic Commands\n"));
  Serial.print(F("  2-Model Number\n"));
  Serial.print(F("  3-Revision Number\n"));
  Serial.print(F("  4-PEC On\n"));
  Serial.print(F("  5-PEC Off\n"));
  Serial.print(F("  6-Bus Probe\n"));
  Serial.print(F("  7-Reset\n"));
  Serial.print(F("\nEnter a command:"));
}

//! Prints a warning if the demo board is not detected.
void print_warning_prompt()
{
  Serial.println(F("\nWarning: Demo board not detected. Linduino will attempt to proceed."));
}

void print_all_voltages()
{
  float   voltage;
  uint8_t page;
  
  for (page = 0; page < 2; page++)
  {
    voltage = pmbus->readVoutWithPage(ltc3882_i2c_address, page);
    Serial.print(F("LTC3882 VOUT "));
    Serial.println(voltage, DEC);
  }
}

void print_all_currents()
{
  float   current;
  uint8_t page;
  
  for (page = 0; page < 2; page++)
  {
    current = pmbus->readIoutWithPage(ltc3882_i2c_address, page);
    Serial.print(F("LTC3882 IOUT "));
    Serial.println(current, DEC);
  }
}

void print_all_status()
{
  uint8_t b;
  uint16_t w;
  uint8_t page;
  
  for (page = 0; page < 2; page++)
  {
    Serial.print(F("PAGE "));
    Serial.println(page, DEC);
    pmbus->setPage(ltc3882_i2c_address, page);
    b = pmbus->readStatusByte(ltc3882_i2c_address);
    Serial.print(F("LTC3880 STATUS BYTE 0x"));
    Serial.println(b, HEX);
    w = pmbus->readStatusWord(ltc3882_i2c_address);
    Serial.print(F("LTC3882 STATUS WORD 0x"));
    Serial.println(w, HEX);  
  }
}

void sequence_off_on()
{
  pmbus->sequenceOffGlobal();
  delay (2000);
  pmbus->sequenceOnGlobal();
}

void margin_high()
{
  pmbus->marginHighGlobal();
}

void margin_low()
{
  pmbus->marginLowGlobal();
}

void margin_off()
{
  pmbus->sequenceOnGlobal();
}

void menu_1_basic_commands()
{
  uint8_t user_command;
  
  do
  {
    //! Displays the Read/Write menu
    Serial.print(F("\nRead/Write\n\n"));
    Serial.print(F("  1-Read All Voltages\n"));
    Serial.print(F("  2-Read All Currents\n"));
    Serial.print(F("  3-Read All Status\n"));
    Serial.print(F("  4-Sequence Off/On\n"));
    Serial.print(F("  5-Margin High\n"));
    Serial.print(F("  6-Margin Low\n"));
    Serial.print(F("  7-Margin Off\n"));
    Serial.print(F("  m-Main Menu\n"));
    Serial.print(F("\nEnter a command: "));

    user_command = read_int();                              //! Reads the user command
    if (user_command == 'm')                                // Print m if it is entered
    {
      Serial.print(F("m\n"));
    }
    else
      Serial.println(user_command);                         // Print user command

    switch (user_command)
    {
      case 1:
        print_all_voltages();
        break;
      case 2:
        print_all_currents();
        break;
      case 3:
        print_all_status();
        break;
      case 4:
        sequence_off_on();
        break;
      case 5:
        margin_high();
        break;
      case 6:
        margin_low();
        break;
      case 7:
        margin_off();
        break;
      default:
        if (user_command != 'm')
          Serial.println(F("Invalid Selection"));
        break;
    }
  }
  while (user_command != 'm');
}


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