PM6641 데이터 시트보기 (PDF) - STMicroelectronics

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PM6641

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.

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Doc ID 13510 Rev 3

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