Data Sheet

LTC7899

analog.com

Rev. 0

3 of 50

Power MOSFET Selection...............................................................................................................................................................31

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

Setting the Output Voltage ............................................................................................................................................................33

RUN Pin and Undervoltage Lockout .............................................................................................................................................33

Soft-Start (SS Pin)...........................................................................................................................................................................34

DRVCC and INTVCC Regulators (OPTI-DRIVE)...................................................................................................................................34

Topside MOSFET Driver Supply (CB, DB).........................................................................................................................................36

Minimum On-Time Considerations ...............................................................................................................................................36

Fault Conditions: Overtemperature Protection ...........................................................................................................................37

Phase-Locked Loop and Frequency Synchronization .................................................................................................................37

Efficiency Considerations...............................................................................................................................................................37

Checking Transient Response .......................................................................................................................................................38

Design Example ..............................................................................................................................................................................39

PC Board Layout Checklist.............................................................................................................................................................41

PC Board Layout Debugging..........................................................................................................................................................41

Typical Application..................................................................................................................................................................................43

Related Parts............................................................................................................................................................................................47

Outline Dimensions .................................................................................................................................................................................48

Ordering Guide.........................................................................................................................................................................................49

REVISION HISTORY

REVISION

NUMBER

REVISION

DATE

DESCRIPTION

PAGE

NUMBER

0

7/25

Initial release

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