Datasheet
MAX8537/MAX8538/MAX8539
Dual-Synchronous Buck Controllers for Point-of-
Load, Tracking, and DDR Memory Power Supplies
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MAX8539
DL2
COMP2
GND
POK2
EN1
VTTR
FB2
SS2
FB1
ILIM2
PGND
LX2
ILIM1
FREQ
AVL
V+
VL
DL1
LX1
DH1
BST1
U1
BST2
DH2
EN2
REFIN
SS1
COMP1
POK1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
C17
1.8nF
C16
1µF
VL
VL
VL
C2
10µF
VOUT1
C3
1000µF
C28
1000µF
C29
1000µF
C5
0.47µF
C6
0.47µF
C11, C30,
C31, C32
680uF
C12, C36, C37
680µF
C13
10µF
C14
1µF
C40
2.2nF
C15
1µF
C19
2.2nF
C18
10pF
C20
56pF
C21
15nF
C22
2.7nF
C24
0.01µF
C25
220pF
D1 D2
R19
100kΩ
R20
100kΩ
R5
100kΩ
R6
100kΩ
R7
2.2Ω
R8
4.7Ω
R9
51.1kΩ
R10
10.0kΩ
R11
82kΩ
R12
2.2kΩ
R13
2.2kΩ
R15
12.7kΩ
R17
10.0kΩ
R18
10.0kΩ
N1
N5
N7
N8
L1
0.8µH
L2
0.5uH
C39
1.0nF
POK1
POK2
EN1
EN2
VIN (10.8V TO 13.2V)
VOUT2
0.9V/
±7A
VOUT1
1.8V/15A
VOUT1
VTTR
R16
10.0kΩ
C23
0.01µF
R14
12kΩ
C4
10µF
N4N3
R21
2.2Ω
R2
750Ω
C7
0.1µF
R22
1.5Ω
R3
1.0kΩ
C10
0.1µF
R25
1Ω
R24
1Ω
Figure 2. MAX8539 DDR Memory Application (400kHz Switching)