LTC3875
37
3875fb
For more information
www.linear.com/LTC3875
TYPICAL APPLICATIONS
Figure
17
a. 4-
Phase
1.0
V/120
A
Step
-Down
Converter
with
Thermal
Balancing
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
CC1
INT
V
CC1
INT
V
CC1
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
CC1
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
Q4 BSC010NE2LSI
Q3 BSC050NE2LS
Q2 BSC010NE2LSI
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
TRSET1
TRSET2
TA
VG
FREQ
RUN2
RUN
IF
AST
ENTMPB
PGOOD
3875 F17a
V
FB
TK/SS
C
IN4
10µF 1210
V
IN
V
IN
C
IN5
10µF 1210
0.25µH
DCR = 0.32mΩ
744301025
L2
C16 220nF
R32 100k 1%
C2 0.1
µF
C19, 220nF
1%
R13 13.3k
R14 20k
R10 1k
R9, 3.01k
R11 3.57k 1%
R16, 10Ω
R12 715Ω 1%
C4
220nF
C3
220nF
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
R34 3.57k 1%
R35 715Ω 1%
+
0.25µH
DCR = 0.32mΩ
744301025
L1
C
OUT1
100µF 6.3V 1210
×
2
C
OUT2
330µF 2.5V 7343
×
2
V
OUT
V
OSNS
+
+
Q1 BSC050NE2LS
C
IN3
10µF 1210
C
IN2
10µF 1210
R20, 10Ω
V
OSNS
–
V
OUT
1V/120A
GND
V
IN
4.5V TO 14V
V
IN
V
IN
GND
J1
J2
J3
J4
C
IN1
270µF 16V
+
R37, 10k
TCOMP1
THERMAL SENSOR
R40, 10k
R43, 2.49k
TCOMP2
THERMAL SENSOR
