EP1C12F256I7N Datasheet, PDF (269/385 Pages) List of Unclassifed Manufacturers – Cyclone Device Handbook, Volume 1

Voltage Regulators
Figures 12–13 through 12–17 show the circuit diagrams of Elantec voltage
regulators listed in Table 12–6.
Figures 12–13 through 12–15 show the switching regulator that converts
5.0-V to 1.5-V with different output current.
Figure 12–13. EL7551C: 5.0-V-to-1.5-V/1-A Synchronous Switching Regulator
V_IN
5.0 V
R₃
39 kΩ
C₃
0.1 μF
C₄
270 pF
C₁
10 μF
Ceramic
1
SGND
2
COSC
3
V_DD
4
PGND
5
PGND
16
PGND
15
V_REF
14
FB
13
V_DRV
12
LX
6
V_IN
7
V_IN
8
EN
11
LX
10
V_HI
9
PGND
EL7551C
R₂
539 Ω
C₅
0.1 μF
R₁
1 kΩ
L₁
10 μH
C₆
0.1 μF
C₇
47 μF
V₀
1.5 V
1A
Altera Corporation
May 2008
12–15
Preliminary