LTC3729_15 Datasheet, PDF (26/30 Pages) Linear Technology – 550kHz, PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator

LTC3729
TYPICAL APPLICATIONS
OPTIONAL
SYNC
CLOCK IN
0.33µF
8.06k, 1%
0.3µF
47k
1000pF
6800pF
100pF
25.5k, 1%
470pF
1
28
2
3
4
RUN/SS
SENSE1⁺
SENSE1^–
CLKOUT ₂₇
TG1 ₂₆
SW1 ₂₅
5 ^EAIN
BOOST1 ₂₄
6
7
8
PLLFLTR
V_IN
PLLIN ^LTC3729 BG1
PHASMD
EXTV_CC
23
22 _5V
21
9 ^ITH
INTV_{CC 20}
10 ^SGND
PGND ₁₉
11
12
13
14
V_DIFFOUT
V_OS–
V_OS+
SENSE2^–
SENSE2⁺
BG2 ₁₈
BOOST2 ₁₇
SW2 ₁₆
TG2 ₁₅
PGOOD
1000pF
24k
75k
47pF
10k
0.01µF ^1nF
1000pF ¹
2
3
4
5
6
7
8
100pF 9
NC ¹⁰
11
12
13
14
RUN/SS
SENSE1⁺
SENSE1^–
CLKOUT
TG1
SW1
EAIN
BOOST1
PLLFLTR
V_IN
PLLIN ^LTC3729 BG1
PHASMD
I_TH
SGND
EXTV_CC
INTV_CC
PGND
V_DIFFOUT
V_OS–
V_OS+
SENSE2^–
SENSE2⁺
BG2
BOOST2
SW2
TG2
PGOOD
28
27
26
25
24
23
22 _5V
21
20
19
18
17
16
15
1000pF
0.47µF
D7
1µF,6.3V
D8
0.47µF
0.47µF
D9
1µF,6.3V
D10
0.47µF
M1
10Ω
1µF
22µF
6.3V
M4
L1
M2
2X150µF GND
16V
M5
L2
0.003Ω
M3
D1
MBRS
340T3
D2
MBRS
340T3
M6
0.003Ω
3X330µF, 6.3V
POSCAP
V_OUT
3.3V/90A
L3
0.003Ω
M7
10Ω
1µF
M8
M9
D3
MBRS
340T3
3X330µF, 6.3V
22µF
2X150µF GND
6.3V
16V
POSCAP
V_IN
12V
D4
MBRS
340T3
M10
M11
M12
L4
0.003Ω
47pF
10k
0.01µF ^1nF
1000pF ¹
2
3
4
5
6
7
8
100pF 9
NC ¹⁰
11
12
13
14
RUN/SS
SENSE1⁺
SENSE1^–
CLKOUT
TG1
SW1
EAIN
BOOST1
PLLFLTR
V_IN
PLLIN ^LTC3729 BG1
PHASMD
I_TH
SGND
EXTV_CC
INTV_CC
PGND
V_DIFFOUT
V_OS–
V_OS+
SENSE2^–
SENSE2⁺
BG2
BOOST2
SW2
TG2
PGOOD
28
27
26
25
24
23
22 _5V
21
20
19
18
17
16
15
1000pF
0.47µF
D11
1µF,6.3V
M13
10Ω
1µF
22µF
6.3V
D12
0.47µF
M16
V_IN: 12V
V_OUT: 3.3V/90A
SWITCHING FREQUENCY = 400kHz
MI – M18: Si7440DP
L1 – L6: 1µH PANASONIC ETQP6F1R0S
D7 – D12: CENTROL CMDSH-3TR
OUTPUT CAPACITORS: SANYO 6TPB330M
L5
0.003Ω
M14
2X150µF GND
16V
M15
D5
MBRS
340T3
3X330µF, 6.3V
POSCAP
M17
M18
D6
MBRS
340T3
L6
0.003Ω
3729 TA03
Figure 11. High Current 3.3V/90A 6-Phase Application
3729fb
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