PM6681ATR datasheet(3/47 Pages) STMICROELECTRONICS

Part #	PM6681ATR

Description	Dual synchronous step-down controller with adjustable LDO

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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3 / 47 page

PM6681A

Contents

3/47

9

Design guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

9.1

Switching frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

9.2

Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

9.3

Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

9.4

Input capacitors selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

9.5

Power MOSFETs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

9.6

Closing the integrator loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

9.7

Other parts design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

9.8

Design example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

9.8.1

Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

9.8.2

Output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

9.8.3

Power MOSFETs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

9.8.4

Current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

9.8.5

Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

9.8.6

Synchronous rectifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

9.8.7

Integrator loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

9.8.8

Output feedback divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

10

Layout guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

11

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

12

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

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