LTC3731H Datasheet, PDF (30/32 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731H
TYPICAL APPLICATIO S
3-Phase Boost Converter. V_IN = 10V to 18V with 36V Load Dump, V_OUT = 50V at 3A
V_IN+
8
1
IN OUT
C18
1µF
LT3010
50V
5
2
SHDN ADJ
R2
1M
C19
1µF
10V
6.5V
GND
R5
4
249k
R1
10Ω
C1
1µF
R3
R4 _OPT
0Ω
C3
OPT
V_OUT+
R7
665k
R6
8.06k
R10 500Ω
S1⁺
R11 500Ω
S1^–
R12 500Ω
S2⁺
R13 500Ω
S2^–
R14 500Ω
S3⁺
R15 500Ω
S3^–
C4
1000pF
C5
1000pF
C6
1000pF
V_IN+
RUN/SS
RUN/SS
C7
0.1µF
R30
OPT
R16
10k
C8
1000pF
1
V_CC
2
PLLIN
CLK ³⁶
PGOOD ³⁵
3
34
PLLFLTR BOOST1
4 _FCB
TG1 ³³
5 _NC
SW1 ³²
6 _NC
BOOST2 ³¹
7 _NC
TG2 ³⁰
8
LTC3731H
29
EAIN
SW2
9 _SGND
V_DR ²⁸
10 _SENSE1+
27
BG1
11 _SENSE1–
26
PGND
12 _SENSE2+
25
BG2
13 _SENSE2–
24
BG3
14 _SENSE3–
23
SW3
15 _SENSE3+
22
TG3
16
21
RUN/SS BOOST3
17
I_TH
18
UVADJ
20
PHASMD
19
SGND
R17
121k
R18
845k
V_IN+
C53
1000pF
C9
220pF
L1
12µH ^D4
30BQ060
+ C17
150µF
63V
V_IN+ V_IN+
C_IN4-C_IN6
10µF
50V
10V TO 18V
V_IN–
WITH 36V
LOAD DUMP
Q1
Si7852DP
S1⁺
R23
0.007Ω
S1^–
C1
4.7µF
L2
12µH ^D4
30BQ060
Q2
Si7852DP
S2⁺
R23
0.007Ω
S2^–
L3
12µH ^D4
30BQ060
V_OUT+
V_OUT+
50V/3A
C16-C18, ₊
C20-C26
1µF
100V
C20
33µF
100V
V_OUT–
3731H TA01
Q3
Si7852DP
6.5V
S3⁺
R23
0.007Ω
S3^–
C_IN4-C_IN6: 10µF, 50V X5R TDK C5750X5R1H106M
C16-C26: 1µF, 100V X7R TAIYO YUDEN HMK432BJ105KM
C17: 150µF, 63V SANYO ALUMINUM ELECTROLYTIC 63MV150GX
C20: 33µF, 100V SANYO ALUMINUM ELECTROLYTIC 100CV33FS
L1-L3: 12µH SUMIDA CDRH127/LD-120
3731hf
30