LTM4673 datasheet(27/132 Pages) AD

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LTM4683

Rev. 0

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OPERATION

POWER MODULE INTRODUCTION

The LTM4683 is a highly configurable quad 31.25A output

standalone nonisolated switching mode step-down DC/

DC power supply with built-in EEPROM NVM with ECC

and I2C-based PMBus/ SMBus 2-wire serial communi-

cation interface capable of 400kHz SCL bus speed. Four

output voltages can be regulated (VOUT0, VOUT1, VOUT2,

VOUT3) with a few external input and output capacitors

and pull-up resistors. Readback telemetry data of input

and output voltages, input and output currents, and mod-

ule temperatures are continually digitized cyclically by an

integrated 16-bit ADC (analog-to-digital converter). 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 Block Diagrams.

One controller for Channels 0 and 1, 2nd for controller

Channels 2 and 3.

POWER MODULE MAJOR FEATURES OVERVIEW

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)

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/VOUT3 All Programmable Up

to 0.8V

Power-Up and Program EEPROM with VBIAS

Input Voltage Up to 14V

∆VBE Temperature Sensing

SYNC Contention Circuit (See the Switching Frequency

and Phase Section for Details)

Fault Logging

Programmable Output Voltage

Programmable Input Voltage On/Off Threshold

Voltage

Programmable Current Limit

Programmable Switching Frequency

Programmable OV/UV Threshold voltage

Programmable ON/Off Delay Times

Programmable Output Rise/Fall Times

Phase-Locked Loop for Synchronous PolyPhase

Operation (2, 3, 4 or 6 Phases)

Nonvolatile Configuration Memory 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

Standalone 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.

LTM4673 Datasheet(PDF) 27 Page - Analog Devices

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