Altera Stratix - Page 563

Altera Corporation 14–15
January 2005 Stratix Device Handbook, Volume 2
Designing with 1.5-V Devices
Figures 14–13 through 14–17 show the circuit diagrams of Elantec voltage
regulators listed in Table 14–6.
Figures 14–13 through 14–15 show the switching regulator that converts
5.0-V to 1.5-V with different output current.
Figure 14–13. EL7551C: 5.0-V-to-1.5-V/1-A Synchronous Switching Regulator
C
5
0.1 μF
C
6
0.1 μF
C
3
0.1 μF
C
1
10 μF
Ceramic
C
4
270 pF
C
7
47 μF
V
0
1.5 V
1 A
V
IN
5.0 V
L
1
10 μH
R
2
539 Ω
R
3
39 kΩ
R
1
1 kΩ
PGND
PGND
FB
LX
LX
V
REF
V
DRV
V
HI
SGND
EN
V
DD
PGND
V
IN
COSC
PGND
V
IN
EL7551C
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9