LTC3731 Datasheet, PDF (28/32 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731
TYPICAL APPLICATIO
Figure 14. 3-Phase 65A Power Supply
OPTIONAL FILTER FOR
SYNCHRONIZATION
1000pF
0.01µF
10k
1µF
1
V_CC
SYNC IN 2
300kHz ₃
4
100pF
6.04k
5
300pF
6
9.09k
7
8
9
0.01µF
S1⁺
S1^{– 1000pF}
S2⁺
S2^{– 1000pF}
S3^–
S3^{+ 1000pF}
10
11
12
13
14
15
16
I_{TH 17}
18
330pF _3.3nF V_IN
2.2k
18k
12k
10Ω
V_CC
PLLIN
CLK
PGOOD
PLLFLTR BOOST1
FCB
TG1
IN⁺
SW1
LTC3731
IN^–
BOOST2
DIFFOUT
TG2
EAIN
SW2
SGND
SENSE1⁺
SENSE1^–
SENSE2⁺
SENSE2^–
SENSE3^–
SENSE3⁺
V_DR
BG1
PGND
BG2
BG3
SW3
TG3
RUN/SS BOOST3
I_TH
PHASMD
UVADJ
SGND
36 _NC
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
V_CC
PGOOD
47k
0.1µF ^1Ω
M1
V_CC
5V TO 7V
V_IN
L1
0.002Ω
V_CC
0.1µF
1µF
10µF
M2
D1
S1⁺
S1^–
V_IN
M3
L2
0.002Ω
M4
D2
S2⁺
S2^–
0.1µF
V_CC
V_IN
M5
L3
0.002Ω
M6
D3
S3⁺
S3^–
V_IN: 3.3V TO 20V
V_OUT: 1.5V AT 65A
SWITCHING FREQUENCY: 300kHz
3731 TA01
C_IN: SANYO OS-CON 25SP68M
C_OUT: 270µF/2V ×8 PANASONIC SP EEUE0D271R
OR 470µF/2.5V ×6 SANYO POSCAP 2R5 TPD470M
D1 TO D3: DIODES INC. B340A
L1 TO L3: 0.8µH SUMIDA CEP125-0R8
M1, M3, M5: IRF7821W ×2, Si7860DP
OR HAT2168 ×2
M2, M4, M6: IRF7832 ×2, Si7892DP ×2
OR HAT2165 ×2
V_OUT
1.5V AT 65A
10µF +
6.3V
×3
C_OUT
10µF +
25V
×5
V_IN
C_IN ^{3.3V TO 20V}
68µF
25V
3731fa
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