LTC3731H_15 Datasheet, PDF (28/34 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731H
Typical Applications
OPTIONAL FILTER FOR
SYNCHRONIZATION
1000pF
0.01µF
10k
1µF
V_CC
1
SYNC IN 2
300kHz ₃
4
100pF
5
6.04k _9.09k
6
7
300pF
8
9
0.01µF
S1⁺
S1^{– 1000pF}
S2⁺
S2^{– 1000pF}
S3^–
S3^{+ 1000pF}
10
11
12
13
14
15
16
I_{TH 17}
330pF _3.3nF V_IN
2.2k
18k
18
12k
10Ω
V_CC
PLLIN
CLK
PGOOD
PLLFLTR BOOST1
FCB
TG1
NC
SW1
LTC3731HG
NC
BOOST2
NC
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
V5
PGOOD
47k
0.1µF ^1Ω
M1
V5
5V TO 7V
V_IN
L1
0.002Ω
V5
0.1µF
1µF
10µF
M2
D1
S1⁺
S1^–
V_IN
M3
L2
0.002Ω
M4
D2
S2⁺
S2^–
0.1µF
V5
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
3731H F14
C_IN: SANYO OS-CON 25SP68M
C_OUT: 270µF/2V s8 PANASONIC SP EEUE0D271R
OR 470µF/2.5V s6 SANYO POSCAP 2R5 TPD470M
D1 TO D3: DIODES INC. B340A
L1 TO L3: 0.8µH SUMIDA CEP125-0R8
M1, M3, M5: IRF7821W s2, Si7860DP
OR HAT2168 s2
M2, M4, M6: IRF7832 s2, Si7892DP s2
OR HAT2165 s2
Figure 14. 3-Phase 65A Power Supply
V_OUT
1.5V AT 65A
10µF +
6.3V
s3
C_OUT
10µF +
25V
s5
V_IN
C_IN ^{3.3V TO 20V}
68µF
25V
3731Hfb
28