Linear LTC3875, Datasheet

Page: 40 / 46

LTC3875
40
3875fb
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TYPICAL APPLICATIONS
Figure
19. 1.0
V/80
A 2-
Phase
High
Efficiency
Step
-Down
Converter
with
AcBel
Power
Block
TK/SS1 V
OSNS1
+
V
OSNS1
–
ITH1 ITH2 V
OSNS2
+
V
OSNS2
–
TK/SS2 SNSA2
+
SNS2
–
SGND/PGND
30 29 28 27 26 25 24 23 22 21 20
SW1
TG1
BOOST1
BG1
V
IN
INT
V
CC
EXT
V
CC
BG2
BOOST2
TG2
SW2
INT
V
CC
INT
V
CC
INT
V
CC
V
IN
1 2 3 4 5 6 7 8 9
10 41
SNSA1
+
SNS1
–
SNSD1
+
TCOMP1
TRSET1
TCOMP1
TRSET1
LTC3875
ILIM
RUN1
RUN INT
V
CC
MODE/PLLIN
PHASMD
CLKOUT CLKOUT
SNSD2
+
11
12
13
14
15
16
17
18
19
C18 0.1
µF
D2
D1, CMDSH-3
R18, 2.2Ω
CMDSH-3
31
32
33
34
35
36
37
38
39
40
ITH
C11, 100pF
R19, 10k
C12 1.5nF
V
OSNS
+
V
OSNS
–
TA
VG
TRSET2
TCOMP2
TA
VG
TRSET2
TCOMP2
FREQ
RUN2
RUN
IF
AST
ENTMPB
PGOOD
3875 F19
V
FB
TK/SS
C16 47nF
R32 100k 1%
C2 0.1
µF
C19, 47nF
1%
R13 13.3k R14 20k
R16, 10Ω
C4 47nF
C3 47nF
C
OUT3
100µF 6.3V 1210 ×
2
C
OUT4
330µF 2.5V 7343 ×
2
V
OUT
C13 1µ
F
C14 4.7µF 10V
C7 0.1
µF
+
C
OUT1
100µF 6.3V 1210 ×
2
C
OUT2
330µF 2.5V 7343 ×
2
V
OUT
V
OSNS
+
+
C
IN4
10µF 1210
R20, 10Ω
V
OSNS
–
V
OUT
1V/80A GND
V
IN
7V TO 14V
V
IN
V
IN
GND
J1
J3 J4
J2
C
IN1
270µF 16V
+
V
IN1
V
IN2
PWMH PWML V
GA
TE
GND GND GND GND
V
OUT1
V
OUT2
TEMP
P
TEMP
N
C
N
C
P
1 7 5 4 3 2 6 9
13
11 12 15 14 10 8
U102
VRA001-4COG
V
IN1
V
IN2
PWMH PWML V
GA
TE
GND GND GND GND
V
OUT1
V
OUT2
TEMP
P
TEMP
N
C
N
C
P
1 7 5 4 3 2 6 9
13
11 12 15 14 10 8
U103
VRA001-4COG
C
IN3
10µF 1210
C
IN2
10µF 1210
V
IN
R34 4.75k 1%
R11 4.75k 1%
C
IN5
10µF 1210
V
IN