User Guide 053
UG053.1
October 26, 2015
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6
PCB Layout Recommendation
The PCB layout is a very important converter design step to make
sure the designed converter works well. For ISL8018, the power
loop is composed of the output inductor L’s, the output capacitor
C
OUT
, the PHASE’s pins and the PGND pin. It is necessary to make
the power loop as small as possible and the connecting traces
among them should be direct, short and wide. The switching
node of the converter, the PHASE pins and the traces connected
to the node are very noisy, so keep the voltage feedback trace
away from these noisy traces. The input capacitor should be
placed as close as possible to the VIN pin and the ground of the
input and output capacitors should be connected as close as
possible. The heat of the IC is mainly dissipated through the
thermal pad. Maximizing the copper area connected to the
thermal pad is preferable. In addition, a solid ground plane is
helpful for better EMI performance. It is recommended to add at
least 5 vias ground connection within the pad for the best
thermal relief.
CR0603-10W-1003FT
8
ea.
R2, R8, R10, R11, R12, R16, R23, R26 RES, SMD, 0603, 100k, 1/10W,
1%, TF, ROHS
VENKEL
CR0603-10W-2003FT
2
ea.
R1, R5
RES, SMD, 0603, 200k, 1/10W,
1%, TF, ROHS
VENKEL
RC0603FR-0747KL
1
ea.
R3
RES, SMD, 0603, 47k, 1/10W, 1%,
TF, ROHS
YAGEO
0
ea.
R17, R27
RES, SMD, 0603, DNP-PLACE
HOLDER, ROHS
0
ea.
R15
RES, SMD, 1210, DNP, DNP, DNP,
TF, ROHS
GT11MSCBE
3
ea.
S1, S4, S5
SWITCH-TOGGLE, SMD, 6PIN, SPDT,
2POS, ON-NONE-ON, ROHS
ITT INDUSTRIES/C&K DIVISION
GT13MSCBE
2
ea.
S2, S3
SWITCH-TOGGLE, SMD, 6PIN, SPDT,
3POS, ON-OFF-ON, ROHS
C&K COMPONENTS
SJ-5003SPBL
4
ea.
Bottom four corners.
BUMPONS, 0.44inW x 0.20inH,
DOMETOP, BLACK
3M
212403-013
1
ea.
Place assembly in bag.
BAG, STATIC, 5x8, ZIPLOC, ROHS
INTERSIL
0
ea.
C11, C12, C13, C14, C17, C18, C21,
C22, C25, C26, C27
DO NOT POPULATE OR PURCHASE
0
ea.
L2, L3
DO NOT POPULATE OR PURCHASE
0
ea.
LX2, VOUT2
DO NOT POPULATE OR PURCHASE
0
ea.
U3, SLAVE
DO NOT POPULATE OR PURCHASE
TABLE 3. BILL OF MATERIALS (Continued)
MANUFACTURER
PART NUMBER
QTY UNITS
REFERENCE
DESIGNATOR
DESCRIPTION
MANUFACTURER
