Altera Stratix - Page 566

14–18 Altera Corporation
Stratix Device Handbook, Volume 2 January 2005
Voltage Regulators
Figures 14–16 and 14–17 show the switching regulator that converts 3.3 V
to 1.5 V with different output currents.
Figure 14–16. EL7562CM: 3.3-V to 1.5-V/2-A Synchronous Switching Regulator
Figure 14–17. EL7563CM: 3.3-V to 1.5-V/4-A Synchronous Switching Regulator
V
OUT
1.5 V
2 A
V
IN
3.3 V
SGND
V
DD
PGND
V
IN
V
IN
EN
C
OSC
PGND
PGND
FB
LX
V
HI
LX
PGND
V
REF
V
DRV
EL7562CM
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
R
3
39 Ω
C
5
0.1 μF
C
6
0.1 μF
C
8
0.1 μF
C
2
0.1 μF
C
3
0.1 μF
C
4
270 pF
C
1
100 μF
C
9
0.1 μF
C
7
100 μF
L
1
2.5 μH
R
2
539 Ω
R
1
1 kΩ
D
2
D
3
D
4
V
OUT
1.5 V
4 A
V
IN
3.3 V
V
REF
C
OSC
V
TJ
PGND
PGND
V
IN
SGND
V
DD
EN
PG
V
HI
LX
LX
PGND
FB
V
DRV
EL7563CM
20
19
18
17
16
15
14
13
PGND
PGND
STP
STN
12
11
9
10
1
2
3
4
5
6
7
8
R
4
22 Ω
C
7
330 μF
L
1
2.5 μH
R
2
513 Ω
R
1
1 kΩ
C
3
0.22 μF
C
6
0.22 μF
C
10
2.2 nF
C
1
330 μF
C
9
0.1 μF
C
8
0.22 μF
C
2
2.2 nF
C
4
390 pF
C
5
0.1 μF
D
1
D
3
D
2
D
4