LTC3890
applicaTions inForMaTion
TRACK/SS1
R
PU2
V
PULL-UP
R
PGOOD2
ITH1
PU1
PGOOD2
V
PULL-UP
PGOOD1
V
PGOOD1
FB1
R1*
L1
R
SENSE
+
–
V
SENSE1
TG1
OUT1
C1*
SENSE1
FREQ
SW1
LTC3890
C
B1
M1
M2
BOOST1
D1*
PHASMD
CLKOUT
PLLIN/MODE
RUN1
BG1
R
IN
C
C
OUT1
f
IN
1µF
V
IN
+
C
CERAMIC
VIN
PGND
GND
RUN2
+
EXTV
CC
C
+
IN
V
SGND
C
IN
INTVCC
–
INTV
CC
SENSE2
OUT2
1µF
C2*
CERAMIC
+
BG2
SENSE2
R2*
M4
L2
M3
D2*
BOOST2
V
ITH2
C
B2
FB2
SW2
TG2
R
SENSE
V
OUT2
TRACK/SS2
ILIM
3890 F11
*R1, R2, C1, C2, D1, D2 ARE OPTIONAL.
Figure 11. Recommended Printed Circuit Layout Diagram
3890fb
28