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| LTC3633A-3_15 Datasheet, PDF (22/28 Pages) Linear Technology – Dual Channel 3A, 20V Monolithic Synchronous Step-Down Regulator | |||
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LTC3633A-2/LTC3633A-3
APPLICATIONS INFORMATION
VIN
12V
CIN
47µF
Ã2
R5
162k
VOUT2
3.3V AT 3A
COUT2
22µF
L2
1µH 0.1µF
R4
R3
54.9k 12.1k
PVIN2 PVIN1 SVIN
RUN1
RUN2
LTC3633A-2
INTVCC
ITH1
ITH2
RT
TRACKSS2
PGOOD2
BOOST2
MODE/SYNC
PHMODE
TRACKSS1
PGOOD1
BOOST1
SW2
VON2
VFB2 SGND PGND
SW1
VON1
VFB1
C2
2.2µF
L1
0.1µF 0.68µH
R1
R2
12.1k 24.3k
Figure 9. Design Example Circuit
VOUT1
1.8V AT 3A
COUT1
47µF
3633a23 F09
VIA TO BOOST1 VIA TO VON1/R2 (NOT SHOWN)
VOUT1
VIAS TO GROUND
PLANE
SGND
(TO NONPOWER
COMPONENTS)
L1
SW1
CBOOST1
COUT1
GND
VIAS TO GROUND
PLANE
CIN
CVCC
VIA TO GROUND
PLANE
VIN
CBOOST2
SW2
L2
CIN
COUT2
GND
VIAS TO GROUND
PLANE
VOUT2
VIAS TO GROUND
PLANE
SGND
(TO NONPOWER
COMPONENTS)
VIAS TO GROUND
PLANE
VIA TO VON1 AND R2 (NOT SHOWN)
COUT1
VIAS TO GROUND
PLANE
GND
CIN
CVCC
CIN
GND
VOUT1
L1
VIA TO BOOST1
SW1
CBOOST1
CBOOST2 VIN
SW2
VIA TO BOOST2
L2
VIAS TO GROUND
PLANE
COUT2
VOUT2
VIA TO BOOST2
3633a23 F10
VIA TO VON2/R4 (NOT SHOWN)
Figure 10. Example of Power Component Layout for QFN Package
3633a23 F11
VIA TO VON2 AND R4 (NOT SHOWN)
Figure 11. Example of Power Component
Layout for TSSOP Package
22
For more information www.linear.com/LTC3633A-2
3633a23fb
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