EL7531
Performance Curves and Waveforms (Continued)
All waveforms are taken at V =3.3V, V =1.8V, I =1A with component values shown on page 1 at room ambient temperature, unless otherwise
IN
O
O
noted.
0.1%
0.0%
12
10
8
V
=5V I =0A
IN
O
V
=3.3V I =0A
IN
O
-0.1%
-0.2%
-0.3%
-0.4%
-0.5%
V
=3.3V I =1A
6
4
2
0
IN
O
V
=5V I =1A
O
-0.6%
-0.7%
IN
-50
0
50
100
150
3.5
4
4.5
5
2.5
3
T
(°C)
J
V
(V)
S
FIGURE 7. PWM MODE LOAD/LINE REGULATIONS vs
JUNCTION TEMPERATURE
FIGURE 8. NO LOAD QUIESCENT CURRENT (PWM MODE)
140
100
V
=3.3V
O
1.4MHz
130
V
=1.8V
O
120
110
100
80
5MHz
12MHz
60
40
20
0
V
=1.5V
O
V
=1.2V V =1.0V
O
O
90
V
=0.8V
O
80
70
60
50
2.0
0
200
400
600
800
1K
1.2K
2.5
3.0
3.5
4.0
(V)
4.5
5.0
5.5
6.0
V
I
(mA)
S
O
FIGURE 9. NO LOAD QUIESCENT CURRENT (PFM MODE)
FIGURE 10. EFFICIENCY vs I (PWM MODE)
O
1
0.5
0.3
12MHz
0.6
1.4MHz
12MHz
0.2
0.1
5MHz
1.4MHz
-0.1
0
5MHz
-0.2
-0.6
-0.3
-0.5
2.5
0
200
400
600
800
1K
1.2K
3
3.5
4
4.5
5
5.5
I
(mA)
V
(V)
O
IN
FIGURE 11. LOAD REGULATION (PWM MODE)
FIGURE 12. LINE REGULATION @ 500mA (PWM MODE)
FN7428.6
August 5, 2005
5
INTERSIL [ Intersil ]
