LT7184S datasheet(22/52 Pages) AD

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Data Sheet

LT7184S

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Rev. 0

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THEORY OF OPERATION

Overview

The LT7184S is a dual-output monolithic PolyPhase DC/DC synchronous step-down regulator. The S in the LT7184S

refers to the second-generation Silent Switcher® technology, which provides fast and clean switching edges, reduces

overall solution size, improves efficiency, and minimizes EMI emissions. The I2C-based serial interface is compatible

with PMBus 1.3, which supports bus speeds up to 1MHz.

Major features include:



Programmable Output Voltage.



Programmable Current Limit.



Programmable Switching Frequency.



Programmable Output Overvoltage and Undervoltage Fault and Warning Thresholds.



Programmable On and Off Delay Times.



Programmable Output Rise/Fall Times.



Programmable Control Loop Compensation.



Programmable Input Undervoltage Threshold.



Dedicated Power Good Output Pin for Each Channel.



Phase-Locked Loop (PLL) for Synchronous, PolyPhase Operation (2, 3, 4, 6, or 8 Phases).



Input and Output Voltage, Output Current, and Die Temperature Telemetry.



Fully Differential Remote VOUT Sense.



Nonvolatile Configuration Memory (NVM) with Error Correcting Code (ECC).



Nonvolatile Event-Based Fault Log.



Optional External Configuration Resistors for Key Operating Parameters.



Optional Time-Based Interconnect for Synchronization Between Multiple Devices.



WP Pin to Write-Protect Internal Configuration.



Standalone Operation using Configuration Resistors or NVM.

A variety of mechanisms for fault and warning handling are available. Fault and warning detection capabilities

include:



Output Undervoltage/Overvoltage Fault and Warning.



Internal Overtemperature Fault and Warning.



Communication, Memory, or Logic (CML) Fault.



Input Overvoltage Fault and Undervoltage Warning.



Output Overcurrent Fault and Warning.



Internal Reference Fault.



External Fault Detection via the Bidirectional FAULT Pins.

A dedicated ALERT pin is provided to indicate that faults or warnings have occurred.

Individual status commands enable fault and warning reporting to identify the specific event.

The LT7184S's FAULT pins enable fault sharing between channels and with other Analog Devices’ power system

management products, including the LTC3880, LTC2974, LTC2978, LTC4676 μModule®, etc. Fault reporting and

shutdown behavior are fully configurable using the FAULT pins and the MFR_FAULT_PROPAGATE_LT7184S

command. Faults can be individually masked, and the fault responses can be programmed to retry (unlatched) or

latch off the regulator output.

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