Datasheet

MAX8686
Single/Multiphase, Step-Down,
DC-DC Converter Delivers Up to 25A Per Phase
16 ______________________________________________________________________________________
BST
31 32 33 34 35 36 37 38 39 40
LX1
GFREQ
POWER
OK
C1
270pF
C17
1μF
C18
0.22μF
C16
0.22μF
C15 0.1μF
C2
33nF
C4
2.2nF
C3
150pF
R5
5.6kΩ
R16
124kΩ
R3
200kΩ
R4
115kΩ
R2
150kΩ
C12 10μF
C11 10μF
INPUT: 6V-20V
30
29
28
27
26
25
24
23
22
21
POK SS ILIM COMP RS+ RS-
LX1
GFREQ
REFIN PHASE/REFO FREQ
IN
N.C.
LX
PGND
U1
PGND PGND PGND PGND
IN IN
LX
RTN
PGND
PGND
PGND
EN/SLOPE
GFREQ
CS+
CS-
AVL
GND
INA
IN
IN
IN
IN
IN
IN
VL
PGND
5
6
7
9
10
4
3
2
1
8
15 16 17 19 20 14 13 12 11 18
R13
10Ω
R1
10kΩ
ENABLE
(EN)
OUTPUT: 1.2V/150A
R46
124kΩ
R12
10Ω
C42 10μF
C71–C94 100μF x 24
C41 10μF
MAX8686
BST
31 32 33 34 35 36 37 38 39 40
PHASE
SHEDDING
(PS)
LX4
C47
1μF
C48
0.22μF
C46
0.22μF
C45 0.1μF
C49
10pF
R45
16.5kΩ
R44
54.9kΩ
30
29
28
27
26
25
24
23
22
21
POK SS ILIM COMP RS+ RS-
LX4
GFREQ
REFIN PHASE/REFO FREQ
IN
N.C.
LX
PGND
U4
PGND PGND PGND PGND
IN IN
LX
RTN
PGND
PGND
PGND
EN/SLOPE
GFREQ
CS+
CS-
AVL
GND
INA
IN
IN
IN
IN
IN
IN
VL
PGND
5
6
7
9
10
4
3
2
1
8
15 16 17 19 20 14 13 12 11 18
R43
10Ω
AVL4
AVL1
AVL4
R42
10Ω
MAX8686
R56
124kΩ
C52 10μF
C51 10μF
C54 1μF
R51 270Ω
L51 0.56μH
BST
31 32 33 34 35 36 37 38 39 40
LX5
C57
1μF
C58
0.22μF
C56
0.22μF
C55 0.1μF
C59
10pF
R55
16.5kΩ
R54
35.7kΩ
30
29
28
27
26
25
24
23
22
21
POK SS ILIM COMP RS+ RS-
LX5
GFREQ
REFIN PHASE/REFO FREQ
IN
N.C.
LX
PGND
U5
PGND PGND PGND PGND
IN IN
LX
RTN
PGND
PGND
PGND
EN/SLOPE
GFREQ
CS+
CS-
AVL
GND
INA
IN
IN
IN
IN
IN
IN
VL
PGND
5
6
7
9
10
4
3
2
1
8
15 16 17 19 20 14 13 12 11 18
R53
10Ω
AVL5
AVL1
AVL5
R52
10Ω
MAX8686
R66
124kΩ
C62 10μF
C61 10μF
C64 1μF
R61 270Ω
L61 0.56μH
BST
31 32 33 34 35 36 37 38 39 40
LX6
C67
1μF
C68
0.22μF
C66
0.22μF
C65 0.1μF
C69
10pF
R65
16.5kΩ
R64
24.3kΩ
30
29
28
27
26
25
24
23
22
21
POK SS ILIM COMP RS+ RS-
LX6
GFREQ
REFIN PHASE/REFO FREQ
IN
N.C.
LX
PGND
U6
PGND PGND PGND PGND
IN IN
LX
RTN
PGND
PGND
PGND
EN/SLOPE
GFREQ
CS+
CS-
AVL
GND
INA
IN
IN
IN
IN
IN
IN
VL
PGND
5
6
7
9
10
4
3
2
1
8
15 16 17 19 20 14 13 12 11 18
R63
10Ω
AVL6
AVL1
AVL6
R62
10Ω
MAX8686
R26
124kΩ
C2 10μF
C21 10μF
C24 1μF
R21 270Ω
L21 0.56μH
BST
31 32 33 34 35 36 37 38 39 40
LX2
C27
1μF
C28
0.22μF
C26
0.22μF
C25 0.1μF
C29
10pF
R25
16.5kΩ
R24
267kΩ
30
29
28
27
26
25
24
23
22
21
POK SS ILIM COMP RS+ RS-
LX2
GFREQ
REFIN PHASE/REFO FREQ
IN
N.C.
LX
PGND
U2
PGND PGND PGND PGND
IN IN
LX
RTN
PGND
PGND
PGND
EN/SLOPE
GFREQ
CS+
CS-
AVL
GND
INA
IN
IN
IN
IN
IN
IN
VL
PGND
5
6
7
9
10
4
3
2
1
8
15 16 17 19 20 14 13 12 11 18
R23
10Ω
AVL2
AVL1
AVL2
R22
10Ω
MAX8686
R36
124kΩ
C32 10μF
C31 10μF
C34 1μF
R31 270Ω
L31 0.56μH
BST
31 32 33 34 35 36 37 38 39 40
LX2
C37
1μF
C38
0.22μF
C36
0.22μF
C35 0.1μF
C39
10pF
R35
16.5kΩ
R34
97.6kΩ
30
29
28
27
26
25
24
23
22
21
POK SS ILIM COMP RS+ RS-
LX3
GFREQ
REFIN PHASE/REFO FREQ
IN
N.C.
LX
PGND
U3
PGND PGND PGND PGND
IN IN
LX
RTN
PGND
PGND
PGND
EN/SLOPE
GFREQ
CS+
CS-
AVL
GND
INA
IN
IN
IN
IN
IN
IN
VL
PGND
5
6
7
9
10
4
3
2
1
8
15 16 17 19 20 14 13 12 11 18
R33
10Ω
AVL3
AVL1
AVL3
R32
10Ω
MAX8686
R57
270Ω
C44 1μF
R48 270Ω
L41 0.56μH
R47
270Ω
R37
270Ω
R67
270Ω
R27
270Ω
C14 1μF
R11 270Ω
L11 0.56μH
R17
270Ω
Figure 4. Multiphase Application at V
IN
= 12V