Rainbow Electronics MAX1718 - Manual (Page 33)

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