Data Sheet

LT7170/LT7170-1

TABLE OF CONTENTS

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Rev. A | 2 of 36

Features................................................................ 1

Applications........................................................... 1

Typical Application.................................................1

General Description...............................................1

Functional Block Diagrams....................................3

Electrical Characteristics....................................... 5

Absolute Maximum Ratings...................................9

Thermal Resistance........................................... 9

ESD Caution.......................................................9

Pin Configuration and Function Descriptions...... 10

Typical Performance Characteristics................... 12

Theory of Operation.............................................17

Overview.......................................................... 17

Switching Regulator Control Loop....................17

NVM................................................................. 17

Power-Up and Initialization...............................18

Soft Start.......................................................... 18

Shutdown......................................................... 18

Warning and Fault Handling.............................18

PGOOD Pin......................................................20

ALERT Pin........................................................20

Applications Information...................................... 21

Using Resistor Configuration Pins....................21

Setting Output Voltage..................................... 21

Setting SYNC and PWM Configuration............ 22

Single Phase for the LT7170............................ 23

Dual Phase for the LT7170-1........................... 24

Operating Frequency Trade-Offs......................24

Minimum On-Time and Minimum Off-Time

Considerations............................................... 24

Programmable Current Limit............................ 24

Inductor Selection.............................................25

Input and Output Capacitors............................ 25

Programmable PWM Control Loop

Compensation................................................ 25

Event-Based Sequencing.................................27

LTpowerPlay GUI............................................. 27

PMBus/I2C Serial Interface Summary................. 28

Layout Considerations.........................................32

Thermal Considerations...................................... 34

Typical Applications............................................. 35

Related Parts....................................................35

Outline Dimensions............................................. 36

Ordering Guide.................................................36

Evaluation Boards............................................ 36

REVISION HISTORY

9/2024—Rev. 0 to Rev. A

Changed PGOOD and ALERT Open-Drain Outputs, Output High Voltage, VOL Parameter to PGOOD

and ALERT Open-Drain Outputs, Output Low Voltage, VOL Parameter, Table 1...........................................5

Changes to Table 5........................................................................................................................................10

Changed Setting Switching Frequency and PWM Mode Section to Setting SYNC and PWM

Configuration Section...................................................................................................................................22

Changes to Setting SYNC and PWM Configuration Section......................................................................... 22

Changes to Table 9 and Table 10.................................................................................................................. 25

Changes to Figure 43.................................................................................................................................... 35

Changes to Ordering Guide........................................................................................................................... 36

1/2024—Revision 0: Initial Version