Operation; Power Module Introduction; Power Module Major Features Overview - Analog Devices LTM4683 Manual

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
2
and I C-based PMBus/ SMBus 2-wire serial communi-
cation interface capable of 400kHz SCL bus speed. Four
output voltages can be regulated (V
V ) with a few external input and output capacitors
OUT3
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 I
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
n
Direct Input and Chip Current Sensing
n
Programmable Loop Compensation Parameters
n
T Start-Up Time: 30ms
n INIT
PWM Synchronization Circuit (See the Switching
n
Frequency and Phase Section)
MFR_ADC_CONTROL for Fast ADC Sampling of
n
One Parameter (as Fast as 8ms) (See the PMBus
Command Details Section)
Fully Differential Output Sensing for All Four Channels;
n
V /V /V /V
OUT0 OUT1 OUT2
to 0.8V
Power-Up and Program EEPROM with V
n
Input Voltage Up to 14V
n
∆V Temperature Sensing
n BE
SYNC Contention Circuit (See the Switching Frequency
n
and Phase Section for Details)
, V , V
OUT0 OUT1 OUT2
2
C later,
All Programmable Up
OUT3
BIAS
For more information
Fault Logging
n
Programmable Output Voltage
n
Programmable Input Voltage On/Off Threshold
n
Voltage
Programmable Current Limit
n
,
Programmable Switching Frequency
n
Programmable OV/UV Threshold voltage
n
Programmable ON/Off Delay Times
n
Programmable Output Rise/Fall Times
n
Phase-Locked Loop for Synchronous PolyPhase
n
Operation (2, 3, 4 or 6 Phases)
Nonvolatile Configuration Memory with ECC
n
Optional External Configuration Resistors for Key
n
Operating Parameters
Optional Time Base Interconnect for Synchronization
n
Between Multiple Controllers
WP Pin to Protect Internal Configuration
n
Standalone Operation After User Factory
n
Configuration
PMBus, Version 1.2, 400kHz-Compliant Interface
n
The PMBus interface provides access to important power
management data during system operation, including:
Internal Controller Temperature
n
Internal Power Channel Temperature
n
Average Output Current
n
Average Output Voltage
n
Average Input Voltage
n
Average Input Current
n
Average Chip Input Current from V
n
Configurable, Latched and Unlatched Individual Fault
n
and Warning Status
Individual channels are accessed through the PMBus
using the PAGE command, i.e., PAGE 0 or 1.
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LTM4683
IN
Rev. 0
27