PM6641 datasheet(2/47 Pages) STMICROELECTRONICS

Part #	PM6641

Description	Monolithic VR for chipset and DDR2/3 supply for ultra-mobile PC (UMPC) applications

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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2 / 47 page

Contents

PM6641

2/47

Contents

1

Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2

Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3

Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1

Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.2

Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3

Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5

Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

7

Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7.1

Memory supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7.1.1

VDDQ switching regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7.1.2

VTT LDO and VTTREF buffered reference . . . . . . . . . . . . . . . . . . . . . . 21

7.1.3

VTT and VTTREF Soft Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7.1.4

S3 and S5 power management pins . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.2

Chipset supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7.3

SW regulators control loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

7.4

SW regulators pulse skipping and PWM mode . . . . . . . . . . . . . . . . . . . . 26

7.5

Output voltage divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

7.6

Outputs Soft-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

7.7

Outputs Soft-End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.8

Switching frequency selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7.9

Phase management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

7.10

Peak current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

7.11

Fault management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

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