LTM4680 datasheet(28/132 Pages) AD

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LTM4681

Rev. 0

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OPERATION

POWER MODULE INTRODUCTION

The LTM4681 is a highly configurable quad 31.25A out-

put standalone nonisolated switching mode step-down

DC/DC power supply with built-in EEPROM NVM (non-

volatile memory) with 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, 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 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 at a later time, for analysis. See

Figure 2 and Figure 3 for Block Diagrams. One controller

for channels 0 and 1, 2nd 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 Frequency and

Phasing Section for Details)

MFR_ADC_CONTROL for Fast ADC Sampling of One

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

for Details)

Fully Differential Output Sensing for All Four Channels;

VOUT0/VOUT1/VOUT2/VOUT3 All Programmable Up to

3.3V

Power-Up and Program EEPROM with VBIAS

Input Voltage Up to 16V

∆VBE Temperature Sensing

SYNC Contention Circuit (Refer to Frequency and

Phase Section for 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 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

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.

LTM4680 Datasheet(PDF) 28 Page - Analog Devices

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