PM6641(2008) 查看數據表（PDF） - STMicroelectronics

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PM6641
(Rev.:2008)

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

STMicroelectronics 

Pin settings

PM6641

2.2

Pin description

Table 2. Pin functions

N°

Pin

Function

1

AGND

Analog and signal ground.

2

SET_SWF

Switching Frequency Setting Input.

See Chapter 7.8: Switching frequency selection on page 29

3 VOUT_1S8 VDDQ/2 Divider Input and Discharge path for 1.8 V rail.

4

CSNS

Current Limit Setting Input for All rails.

See Chapter 7.10: Peak current limit on page 31

5 SGND_1S8 Switcher power ground for 1.8 V rail.

6 SGND_1S8 Switcher power ground for 1.8 V rail.

7

VSW_1S8 Switch node for 1.8 V rail.

8

VSW_1S8 Switch node for 1.8 V rail.

9

VIN_1S8 Power supply input for 1.8 V rail.

10

VIN_1S8 Power supply input for 1.8 V rail.

11

VFB_1S8

Feedback Input for 1.8 V rail.

See Chapter 7.5: Output voltage divider on page 27

Loop Compensation Output for 1.8 V rail. See Chapter 7.3: SW regulators

12 COMP_1S8 control loop on page 24 and Chapter 8.4: SW regulator compensation

components selection on page 38 sections for details.

13

SS_1S8

Positive Terminal of the external Soft-Start Capacitor for 1.8 V rail.

See Chapter 7.6: Outputs Soft-Start on page 28 section for details.

14

SS_1S05

Positive Terminal of the external Soft-Start Capacitor for 1.05 V rail.

See Chapter 7.6: Outputs Soft-Start on page 28 section for details.

Loop Compensation Output for 1.05 V rail. See Chapter 7.3: SW regulators

15 COMP_1S05 control loop on page 24 and Chapter 8.4: SW regulator compensation

components selection on page 38 for details.

16

VFB_1S05

Feedback Input for 1.05 V rail.

See Chapter 7.5: Output voltage divider on page 27 section for details

17 SGND_1S05 Switcher power ground for 1.05 V rail.

18 SGND_1S05 Switcher power ground for 1.05 V rail.

19 VSW_1S05 Switch node for 1.05 V rail.

20 VSW_1S05 Switch node for 1.05 V rail.

21

VIN_1S05 Power supply input for 1.05 V rail.

22

VIN_1S05 Power supply input for 1.05 V rail.

23

PG_1S05

Power-Good Signal for 1.05 V rail. Open Drain. See Chapter 7.2: Chipset

supply on page 22 section for details.

24

PG_1S8

Power-Good Signal for 1.8 V rail. Open Drain. See Chapter 7.1.1: VDDQ

switching regulator on page 20 section for details.

25

PG_1S5

Power-Good Signal for 1.5 V rail. Open Drain. See Chapter 7.2: Chipset

supply on page 22 section for details.

6/47

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