Datasheet

LTC3633A-2/LTC3633A-3
22
3633a23f
APPLICATIONS INFORMATION
RUN1
RUN2
RT
TRACKSS2
PGOOD2
LTC3633A-2
BOOST2
3633a23 F09
0.1µF
L2
1µH
R4
54.9k
R3
12.1k
SW2
V
ON2
PV
IN2
PV
IN1
SV
IN
V
FB2
PHMODE
TRACKSS1
PGOOD1
BOOST1
SW1
V
ON1
V
FB1
C
OUT2
22µF
V
OUT2
3.3V AT 3A
0.1µF
L1
0.68µH
R2
24.3k
R1
12.1k
C
OUT1
47µF
V
OUT1
1.8V AT 3A
V
IN
12V
C
IN
47µF
×2
R5
162k
MODE/SYNC
ITH1
ITH2
INTV
CC
C2
2.2µF
PGNDSGND
Figure 9. Design Example Circuit
Figure 10. Example of Power Component Layout for QFN Package Figure 11. Example of Power Component
Layout for TSSOP Package
SW2
C
BOOST2
C
BOOST1
CV
CC
SW1
VIAS TO GROUND
PLANE
VIA TO GROUND
PLANE
VIAS TO GROUND
PLANE
VIAS TO GROUND
PLANE
VIA TO BOOST1
VIA TO BOOST2 VIA TO V
ON2
/R4 (NOT SHOWN)
VIA TO V
ON1
/R2 (NOT SHOWN)
V
OUT2
GND
V
IN
GND
V
OUT1
SGND
(TO NONPOWER
COMPONENTS)
3633a23 F10
C
OUT2
C
IN
C
IN
C
OUT1
L2
L1
SW1
SW2
VIAS TO GROUND
PLANE
VIAS TO GROUND
PLANE
VIAS TO GROUND
PLANE
VIAS TO GROUND
PLANE
VIA TO BOOST2
VIA TO BOOST1
VIA TO V
ON2
AND R4 (NOT SHOWN)
VIA TO V
ON1
AND R2 (NOT SHOWN)
V
OUT2
V
OUT1
SGND
(TO NONPOWER
COMPONENTS)
3633a23 F11
L1
L2
C
OUT2
C
OUT1
C
IN
C
IN
GND
GND
V
IN
C
BOOST1
C
BOOST2
CV
CC