LTC3731 Linear Technology, LTC3731 Datasheet - Page 28

• Manufacturer Part Number: LTC3731
• Description: Synchronous Buck Switching Regulator Controller
• Manufacturer: Linear Technology

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TYPICAL APPLICATIO
LTC3731
28
OPTIONAL FILTER FOR
SYNCHRONIZATION
V
V
SWITCHING FREQUENCY: 300kHz
1000pF
100pF
330pF
IN
OUT
6.04k
2.2k
10k
: 3.3V TO 20V
: 1.5V AT 65A
0.01µF
0.01µF
3.3nF
S1
S1
S2
S2
S3
S3
V
9.09k
IN
+
–
+
–
–
+
1000pF
1000pF
1000pF
300pF
SYNC IN
300kHz
18k
V
CC
1µF
I
TH
12k
10
11
12
13
14
15
16
17
18
C
C
D1 TO D3: DIODES INC. B340A
1
2
3
4
5
6
7
8
9
IN
OUT
: SANYO OS-CON 25SP68M
U
V
PLLIN
PLLFLTR
FCB
IN
IN
DIFFOUT
EAIN
SGND
SENSE1
SENSE1
SENSE2
SENSE2
SENSE3
SENSE3
RUN/SS
I
UVADJ
: 270µF/2V ×8 PANASONIC SP EEUE0D271R
TH
CC
OR 470µF/2.5V ×6 SANYO POSCAP 2R5 TPD470M
+
–
LTC3731
+
–
+
–
–
+
PHASMD
BOOST1
BOOST2
BOOST3
PGOOD
10Ω
Figure 14. 3-Phase 65A Power Supply
PGND
SGND
SW1
SW2
SW3
BG1
BG2
BG3
CLK
TG1
TG2
V
TG3
DR
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
NC
3731 TA01
1µF
0.1µF
V
CC
0.1µF
0.1µF
V
CC
10µF
V
1Ω
CC
PGOOD
47k
L1 TO L3: 0.8µH SUMIDA CEP125-0R8
M1, M3, M5: IRF7821W ×2, Si7860DP
M2, M4, M6: IRF7832 ×2, Si7892DP ×2
M1
M2
M3
M4
M5
M6
V
5V TO 7V
V
V
V
CC
IN
IN
IN
D1
D2
D3
OR HAT2168 ×2
OR HAT2165 ×2
L1
L2
L3
S1
S2
S3
+
+
+
0.002Ω
0.002Ω
0.002Ω
S1
S2
S3
–
–
–
1.5V AT 65A
10µF
6.3V
×3
10µF
25V
×5
V
OUT
+
+
C
C
68µF
25V
OUT
IN
V
3.3V TO 20V
IN
3731fa