Datasheet

MAX1917
Tracking, Sinking and Sourcing, Synchronous Buck
Controller for DDR Memory and Termination Supplies
______________________________________________________________________________________ 13
POK
V+
DDR
EN/HSD
REF
GND
ILIM
VTT
VTTR
PGND
VL
BST
DH
LX
DL
FSEL
2.5V
C2
2 x 330µF
6V
C1
1µF
6.3V
C8
0.47µF/10V
V+
V
DDR
PGND
C3
4.7µF
10V
C4
0.47µF
10V
C7
1µF/6.3V
C9
0.47µF/25V
2.5V
5.5V TO 14V
1.25V AT 7A
L1
0.68µH/9A
Q2
IRF7463
Q1
IRF7463
D1
CMPSH-3
Q3
2N7002K
R3
20kΩ
R2
5.1kΩ
VL
VL
SHDN
POK
VL
OUTPUT CAPACITORS ARE SELECTED TO COMPLY WITH JEDEC SPECIFICATIONS
C6
4 x 270µF
2V
V
OUT
V
IN
VTTR
MAX1917
2mΩ
3
10
2
1
7
5
6
8
11
14
15
16
12
13
4
9
Typical Application Circuits (continued)
POK
V+
DDR
EN/HSD
REF
GND
ILIM
VTT
VTTR
PGND
VL
BST
DH
LX
DL
FSEL
2.5V
C2
330µF
6V
C1
1µF
6.3V
C8
0.47µF/10V
V+
V
DDR
PGND
C3
2.2µF
10V
C4
0.22µF
10V
C7
1µF/6.3V
C9
0.47µF/25V
2.5V
5.5V TO 14V
1.25V AT 3.5A
L1
1.0µH/5A
Q2
IRF7811W
Q1
IRF7811W
D1
CMPSH-3
Q3
2N7002K
R3
20kΩ
R2
5.1kΩ
VL
VL
SHDN
POK
VL
OUTPUT CAPACITORS ARE SELECTED TO COMPLY WITH JEDEC SPECIFICATIONS.
C6
3 x 270µF
2V
C5
10µF
6.3V
V
OUT
V
IN
VTTR
MAX1917
3
10
2
1
7
5
6
8
11
14
15
16
12
13
4
9
Figure 5. Typical Application Circuit for 1.25V at 3.5A Output
Figure 4. Typical Application Circuit for 1.25V at 7A Output Using Voltage Positioning