LTC3731_15 Datasheet, PDF (30/34 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731
TYPICAL APPLICATIONS
V_CC
1µF ^10Ω
+
V5
V_CC
330pF
8.2k
V_CC ¹ V_CC
2 _PLLIN
CLKOUT ³⁶ CLK1
PGOOD ³⁵
PGOOD
BOOST1
BOOST3
10k
BOOST2
10µF 10µF
CER 10V
3.3k
V_OUTS+
3 _{PLLFLTR BOOST1} 34
4 _FCB
TG1 ³³
5 _IN+
SW1 ³²
0.1µF ^1Ω
V_IN
M1
L1 _0.002Ω
V_OUTS–
4.7k
15k
220pF
6
LTC3731G
IN^–
BOOST2
31
7 _DIFFOUT
TG2 ³⁰
0.1µF
X2
M2,3
D1
S1⁺
S1^–
DIFFOUT
EAIN
S1^{+ 10Ω ×6}
8 _EAIN
9 _SGND
10 _SENSE1+
SW2 ²⁹
V_DR ²⁸
BG1 ²⁷
1µF ⁺
V_IN
M4
L2 _0.002Ω
S1^–
1000pF
11 _{SENSE1– PGND} 26
CER
4.7µF
X2
M5,6
D2
S2⁺
12 _SENSE2+
BG2 ²⁵
S2⁺
S2^–
S2^–
1000pF
13 _SENSE2–
BG3 ²⁴
S3^–
0.1µF S3⁺
1000pF
357k
V_IN
RUN/SS
14 _SENSE3–
SW3 ²³
15 _SENSE3+
TG3 ²²
16 _{RUN/SS BOOST3} 21
17 _ITH
18 _UVADJ
PHASMD ²⁰
SGND2 ¹⁹
0.1µF
V_CC
M7
X2
M8,9
V_IN
L3
0.002Ω
D3
S3⁺
S3^–
121k
270pF
I_TH
1.2k
2700pF
100pF 1000pF
1000pF
UVADJ
0.01µF
10k
V_CC
CLK1
1000pF
V_OUTS+
V_OUTS–
DIFFOUT
EAIN 10pF
100pF
S4^{+ 10Ω ×6}
S4^–
1000pF
S5⁺
S5^–
1000pF
S6^–
S6⁺
1000pF
RUN/SS
UVADJ
1 _VCC
2 _PLLIN
CLKOUT ³⁶ CLKOUT ^PGOOD
PGOOD ³⁵
3 _{PLLFLTR BOOST4} 34
4 _FCB
TG4 ³³
0.1µF ^10Ω
5 _IN+
SW4 ³²
6
LTC3731G
IN^–
BOOST5
31
7 _DIFFOUT
TG5 ³⁰
0.1µF
8 _EAIN
SW5 ²⁹
9 _SGND
10 _SENSE4+
11 _SENSE4–
V_DR ²⁸
BG4 ²⁷
PGND ²⁶
1µF ⁺
CER
4.7µF
12 _SENSE5+
BG5 ²⁵
13 _SENSE5–
BG6 ²⁴
14 _SENSE6–
SW6 ²³
15 _SENSE6+
TG6 ²²
16 _{RUN/SS BOOST6} 21
0.1µF
17 _ITH
18 _UVADJ
PHASMD ²⁰
SGND2 ¹⁹
V5
BOOST4
BOOST6
BOOST5
V_IN
M10
L4
0.002Ω
X2
M11,12
D4
S4⁺
S4^–
V_IN
M13
L5 _0.002Ω
X2
M14,15
D5
S5⁺
S5^–
M16
X2
M17,18
V_IN
L6
0.002Ω
3731 F15
D6
S6⁺
S6^–
V_OUT
+
C_OUT
+
V_IN
C_IN
NOTES:
V5: 5V TO 7V
V_IN: 10V TO 14V; V_OUT: 2.5V/100A
SWITCHING FREQUENCY: 500kHz (V5 = 5V)
M1, M4, M7, M10, M13, M16:
SILICONIX Si7390DP OR HAT2168
M2, M3, M5, M6, M8, M9, M11, M12, M14, M15,
M17, M18: SILICONIX Si7356DP OR HAT2165
D1 TO D6: B320A
L1 TO L6: TOKO FDH1040: 0.56µH
C_IN: 10µF/16V CERAMIC × 10 + 270F/16V SANYO OS-CON
C_OUT: 100µF/6.3V/X5R × 10 + 330F/4V × 8
Figure 15. 2.5V/100A Power Supply
3731fc
30