Notebook CPU Step-Down Controller for Intel
-
Mobile Voltage Positioning (IMVP II)
V
BATT
GND IN
ALL ANALOG GROUNDS
CONNECT TO LOCAL PLANE ONLY
VIA TO GND
NEAR Q2 SOURCE
MAX1718
V
CC
CIN
GND
OUT
CC
Q1
REF
V
DD
D1
Q2
COUT
V
OUT
GND
VIA TO SOURCE
OF Q2
R6
CONNECT LOCAL ANALOG GROUND PLANE DIRECTLY TO GND FROM
THE SIDE OPPOSITE THE V CAPACITOR GND TO AVOID V GROUND
DD
DD
VIA TO FB
AND FBS
CURRENTS FROM FLOWING IN THE ANALOG GROUND PLANE.
L1
VIA TO LX
NOTES: "STAR" GROUND IS USED.
D1 IS DIRECTLY ACROSS Q2.
INDUCTOR DISCHARGE PATH HAS LOW DC RESISTANCE
Figure 19. Power-Stage PC Board Layout Example
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