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APPLICATIONS INFORMATION
V
IN
R
IN
C
CLKOUT
I
TH1
LTC3875
+
V
OSNS1
–
V
OSNS
+
SNSA1
–
SNS1
+
SNSD1
FREQ
I
LIM
f
MODE/PLLIN
IN
RUN1
RUN2
SGND
–
SNSA2
–
SNS2
+
SNSD2
–
V
OSNS2
+
V
OSNS2
I
TH2
TK/SS2
Figure 14. Recommended Printed Circuit Layout Diagram
SW1
D1
IN
SW2
D2
BOLD LINES INDICATE
HIGH SWITCHING
CURRENT. KEEP LINES
TO A MINIMUM LENGTH.
Figure 15. Branch Current Waveforms
For more information
TK/SS1
R
PU2
V
PULL-UP
PGOOD
PGOOD
PHASMD
IFAST
TG1
SW1
C
B1
BOOST1
BG1
V
IN
C
VIN
1µF
PGND
1µF
C
EXTV
INTVCC
CC
4.7µF
INTV
CC
BG2
BOOST2
C
B2
SW2
TG2
L1
V
OUT1
C
OUT1
L2
V
OUT2
C
OUT2
www.linear.com/LTC3875
LTC3875
L1
V
OUT1
M1
M2
D1
(OPT)
10µF ×2
R
IN
CERAMIC
2.2
C
OUT1
V
GND
IN
C
IN
C
OUT2
10µF ×2
CERAMIC
M4
M3
D2
(OPT)
V
OUT2
L2
3875 F14
R
L1
R
L2
3875 F15
3875fb
33
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