Datasheet

LTC3731
29
3731fc
TYPICAL APPLICATIONS
0.01µF
1µF
10k
V
CC
SYNC IN
300kHz
300pF
1000pF
S1
+
S1
S2
+
S2
S3
S3
+
V
CC
PLLIN
PLLFLTR
FCB
IN
+
IN
DIFFOUT
LTC3731G
EAIN
SGND
SENSE1
+
SENSE1
SENSE2
+
SENSE2
SENSE3
SENSE3
+
RUN/SS
I
TH
I
TH
UVADJ
CLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
PGOOD
BOOST1
TG1
SW1
BOOST2
TG2
SW2
V
DR
BG1
PGND
BG2
BG3
SW3
TG3
BOOST3
PHASMD
SGND
1000pF
OPTIONAL FILTER FOR
SYNCHRONIZATION
100pF
6.04k
9.09k
10Ω
V
CC
5V TO 7V
V
IN
M1
M2 D1
S1
+
S1
L1
0.002Ω
0.01µF
2.2k
3.3nF
330pF
1000pF
1µF
NC
3731 F14
V
IN
: 3.3V TO 20V
V
OUT
: 1.5V AT 65A
SWITCHING FREQUENCY: 300kHz
PGOOD
47k
1000pF
10µF
0.1µF
V
CC
0.1µF
0.1µF
V
CC
V
CC
V
IN
M3
M4 D2
S2
+
S2
L2
0.002Ω
V
IN
M5
M6 D3
S3
+
S3
L3
0.002Ω
10µF
6.3V
×3
C
OUT
V
IN
3.3V TO 20V
V
OUT
1.5V AT 65A
+
10µF
25V
×5
C
IN
68µF
25V
+
C
IN
: SANYO OS-CON 25SP68M
C
OUT
: 270F/2V ×8 PANASONIC SP EEUE0D271R
OR 470F/2.5V ×6 SANYO POSCAP 2R5 TPD470M
D1 TO D3: DIODES INC. B340A
L1 TO L3: 0.8H SUMIDA CEP125-0R8
M1, M3, M5: IRF7821W ×2, Si7860DP
OR HAT2168 ×2
M2, M4, M6: IRF7832 ×2, Si7892DP ×2
OR HAT2165 ×2
V
IN
18k
12k
Figure 14. 3-Phase 65A Power Supply