LTM4682 datasheet(27/130 Pages) AD

27 / 130 page

LTM4682

Rev. A

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OPERATION

POWER MODULE INTRODUCTION

The LTM4682 is a highly configurable quad 31.25A output

standalone nonisolated switching mode step-down DC/

DC power supply with built-in EEPROM NVM with error

correction coding (ECC) and I2C-based PMBus/SMBus

2-wire serial communication interface capable of 400kHz

SCL bus speed. Four output voltages can be regulated

(VOUT0, VOUT1, VOUT2, and VOUT3) with a few external input

and output capacitors and pull-up resistors. Readback

telemetry data of input and output voltages and input and

output currents, and module temperatures are continually

digitized cyclically by an integrated 16-bit analog-to-digi-

tal converter (ADC). Many fault thresholds and responses

are customizable. Data can be autonomously saved to

EEPROM when a fault occurs, and the resulting fault log

can be retrieved over I2C later, for analysis. See Figure 2

and Figure 3 for the Block Diagrams. One controller for

Channels 0 and 1, and second controller for Channels 2

and 3.

POWER MODULE OVERVIEW, MAJOR FEATURES

Major Features Include:

Dedicated Power Good Indicators

Direct Input and Chip Current Sensing

Programmable Loop Compensation Parameters

TINIT Start-Up Time: 30ms

PWM Synchronization Circuit, (See the Switching

Frequency and Phase Section for More Details)

MFR_ADC_CONTROL for Fast ADC Sampling of One

Parameter (as Fast as 8ms) (See the PMBus Command

Details Section)

Fully Differential Output Sensing for All Four Channels;

VOUT0, VOUT1, VOUT2, and VOUT3. All Programmable Up

to 1.2V

Power-Up and Program EEPROM with VBIAS

Input Voltage Up to 16V

∆VBE Temperature Sensing

SYNC Contention Circuit (See the Switching Frequency

and Phase Section for More Details)

Fault Logging

Programmable Output Voltage

Programmable Input Voltage On and Off

Threshold Voltage

Programmable Current Limit

Programmable Switching Frequency

Programmable OV and UV Threshold Voltage

Programmable ON and Off Delay Times

Programmable Output Rise/Fall Times

Phase-Locked Loop for Synchronous PolyPhase®

Operation (2, 3, 4 or 6 Phases)

Nonvolatile Memory Configuration with ECC

Optional External Configuration Resistors for Key

Operating Parameters

Optional Time Base Interconnect for Synchronization

Between Multiple Controllers

WP Pin to Protect Internal Configuration

Stand Along Operation After User Factory Configuration

PMBus, Version 1.2, 400kHz-Compliant Interface

The PMBus interface provides access to important power

management data during system operation including:

Internal Controller Temperature

Internal Power Channel Temperature

Average Output Current

Average Output Voltage

Average Input Voltage

Average Input Current

Average Chip Input Current from VIN

Configurable, Latched and Unlatched Individual Fault

and Warning Status

Individual channels are accessed through the PMBus

using the PAGE command, i.e., PAGE 0 or 1.

Fault reporting and shutdown behavior are fully con-

figurable. Four individual FAULT0, FAULT1, FAULT2,

LTM4682 Datasheet(PDF) 27 Page - Analog Devices

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