Data Sheet

LTC7897

analog.com

Rev. A

3 of 53

CIN and COUT Selection .....................................................................................................................................................................32

Setting the Output Voltage ............................................................................................................................................................32

RUN Pin and Overvoltage/Undervoltage Lockout .......................................................................................................................33

Soft-Start and Tracking (TRACK/SS Pin) .......................................................................................................................................34

DRVCC and INTVCC Regulators (OPTI-DRIVE)...................................................................................................................................35

Topside MOSFET Driver Supply (CB, DB).........................................................................................................................................37

Minimum On-Time Considerations ...............................................................................................................................................38

Fault Conditions: Current Limit and Foldback .............................................................................................................................38

Fault Conditions: Overvoltage Protection ....................................................................................................................................38

Fault Conditions: Overtemperature Protection ...........................................................................................................................38

Phase-Locked Loop and Frequency Synchronization .................................................................................................................38

Efficiency Considerations...............................................................................................................................................................39

Checking Transient Response .......................................................................................................................................................40

Design Example ..............................................................................................................................................................................41

PC Board Layout Checklist.............................................................................................................................................................42

PC Board Layout Debugging..........................................................................................................................................................43

Typical Application..................................................................................................................................................................................44

Related Parts............................................................................................................................................................................................50

Outline Dimensions .................................................................................................................................................................................51

Ordering Guide.........................................................................................................................................................................................52

REVISION HISTORY

REVISION

NUMBER

REVISION

DATE

DESCRIPTION

PAGE

NUMBER

0

2/25

Initial release

—

A

7/25

Updated Features and General Description sections

Updated Specifications and Absolute Maximum Ratings sections

Updated Pin Descriptions table

Updated Figure 4, Figure 23, Figure 25, and Figure 30

Updated DRVCC and INTVCC Regulators (OPTI-DRIVE) section

Updated Minimum On-Time Considerations section

Updated Efficiency Considerations section

Updated Figure 54 and Figure 58

1

4‒9

11, 12

14, 18, 19

35, 37

38

40

46, 48