Datasheet
MAX8537/MAX8538/MAX8539
Dual-Synchronous Buck Controllers for Point-of-
Load, Tracking, and DDR Memory Power Supplies
10 ______________________________________________________________________________________
MAX8537
DL2
COMP2
GND
POK2
EN1
VTTR
FB2
SS2
FB1
ILIM2
PGND
LX2
ILIM1
FREQ
AVL
V+
VL
DL1
LX1
DH1
U1
BST1
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
3.9nF
C16
1µF
VL
VL
VL
C2
10µF
C3
1000µF
C28
1000µF
C29
1000µF
C5
0.47µF
C8
47pF
C6
0.47µF
C9
47pF
C11, C30,
C31, C32
680µF
C12, C36
220
µF
C13
10µF
C14
1µF
C15
1µF
C19
8.2nF
C18
15pF
C20
39pF
C21
3.9nF
C22
820pF
C24
0.01µF
C25
220pF
D1 D2
R2
402Ω
R3
402Ω
R19
100kΩ
R20
100kΩ
R5
100kΩ
R6
100kΩ
R7
2.2Ω
R8
4.7Ω
R9
51.1kΩ
R10
10.0kΩ
R11
51kΩ
R12
510Ω
R13
1.2kΩ
R15
21.5kΩ
R17
10.0kΩ
R18
10.0kΩ
N1
N5
N8
N7
L1
0.9µH
L2
0.8uH
POK1
POK2
EN1
EN2
VIN (10.8V TO 13.2V)
VOUT2
1.25V/
±12A
VOUT1
2.5V/20A
VTTR
R16
10.0kΩ
C23
0.01µF
R14
22kΩ
C4
10µF
N3N4
C1
1000µF
C26
1000µF
C27
1000µF
R1
0.005Ω
R24
3.3Ω
C41
47nF
C42
0.15µF
R4
0.003Ω
R25
3.3Ω
Figure 1. Typical Application Circuit: MAX8537 DDR Memory Application (400kHz Switching)