LTC2977 datasheet(35/138 Pages) AD

35 / 138 page

LTM4664A

Rev. 0

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The LTM4664A Power System Management (PSM)

includes a highly configurable dual 25A/30A output

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. Two output voltages can be regulated

(VOUTC0, VOUTC1—collectively, VOUTn) with a few exter-

nal 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 anal-

ysis. See Figure 2 for Block Diagram.

PSM SECTION 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 Both Channels;

VOUT0/VOUT1 Both Programmable Up to 1.5V

Power-Up and Program EEPROM with EXTVCC

Input Voltage Up to 18V

ΔVBE 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 per channel

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 Timebase 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 configu-

rable. Two individual FAULT_C0, FAULT_C1 outputs are

provided, both of which can be masked independently.

DUAL 25A/30A PSM OPERATION

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