Datasheet

PM6641 Pin settings
Doc ID 13510 Rev 3 7/47
26 SS_1S5
Positive terminal of the external soft-start capacitor for 1.5 V rail.
See Chapter 7.6: Outputs soft-start on page 28 section for details.
27 COMP_1S5
Loop compensation output for 1.5 V rail. Chapter 7.3: SW regulators control
loop on page 24 and Chapter 8.4: SW regulator compensation components
selection on page 38 sections for details.
28 VFB_1S5
Feedback input for 1.5 V rail.
See Chapter 7.5: Output voltage divider on page 27 section for details
29 SGND_1S5 Switcher power ground for 1.5 V rail.
30 SGND_1S5 Switcher power ground for 1.5 V rail.
31 VSW_1S5 Switch node for 1.5 V rail.
32 VSW_1S5 Switch node for 1.5 V rail.
33 VIN_1S5 Power supply input for 1.5 V rail.
34 EN_1S05 Enable input for 1.05 V rail.
35 EN_1S5 Enable input for 1.5 V rail.
36 EN_VTT
Enable input for VTT rail. High in S0 system states. See Chapter 7.1.4: S3
and S5 power management pins on page 22 section for details.
37 EN_1S8
Enable input for 1.8 V (VDDQ) rail. High in S0-S3 system states.
See Chapter 7.1.4: S3 and S5 power management pins on page 22 section
for details.
38 AGND Analog and signal ground.
39 SET_PH1
Switching regulator phase control.
See Chapter 7.9: Phase management on page 30 section for details.
40 AGND Analog and signal ground.
41 AVCC Analog circuitry supply. Connect to +5 V by a simple RC filter.
42 VTTGND LDO linear regulator power ground.
43 VTT
LDO linear regulator output. DDR2-3 termination voltage. See Chapter 7.1:
Memory supply on page 20 and Chapter 7.1.2: VTT LDO and VTTREF
buffered reference on page 21 sections for details.
44 LDOIN LDO linear regulator input. Typically connected to the 1.8 V rail.
45 VTTREF
Reference voltage buffer output. See Chapter 7.1: Memory supply on
page 20 and Chapter 7.1.2: VTT LDO and VTTREF buffered reference on
page 21 sections for details.
46 DSCG
Tracking/non-tracking discharge selection for DDR2-3 section. See
Chapter 7.7: Outputs soft-end on page 29 section for details.
47 VTTFB Feedback input for VTT linear regulator output.
48 VCC +5 V switching circuitry supply. Bypass to AGND by a 100 nF capacitor.
Table 2. Pin functions (continued)
n° Pin Function