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