EL7531
Performance Curves and Waveforms
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.
100
95
90
85
80
75
70
65
60
55
50
45
40
100
90
80
70
60
50
40
30
20
10
0
V
=3.3V
O
V
=3.3V
O
V
=2.5V
O
V
=2.5V
O
V
=1.8V
O
V
=1.8V
O
V
=1.0V
V
=1.5V
O
O
V
=1.5V
O
V
=1.2V
O
V
=0.8V
O
V
=1.0V
O
V
=1.2V
O
V
=0.8V
O
V
=5V
IN
V
=5V
IN
0.001
0.010
0.100
1.000
0.001
0.010
0.100
1.000
I
(A)
O
I (A)
O
FIGURE 1. EFFICIENCY vs I (PFM/PWM MODE)
FIGURE 2. EFFICIENCY vs I (PWM MODE)
O
O
100
100
95
90
85
80
75
70
65
60
55
50
45
40
V
V
=2.5V
=1.8V
V
V
=2.5V
=1.8V
O
90
80
70
60
50
40
30
20
10
0
O
O
O
V
=1.5V
O
V
=1.2V
O
V
=1.5V
O
V
=1.2V
O
V
=1.0V
O
V
=1.0V
O
V
=0.8V
O
V
=0.8V
(A)
O
V
=3.3V
IN
V
=3.3V
IN
0.001
0.010
0.100
1.000
0.001
0.010
0.100
1.000
I
I
(A)
O
O
FIGURE 3. EFFICIENCY vs I (PFM/PWM MODE)
O
FIGURE 4. EFFICIENCY vs I (PWM MODE)
O
1.44
0.1%
0.0%
V
=3.3V I =1A
O
IN
V
=5V I =1A
O
IN
V
=5V I =0A
O
IN
1.42
1.4
-0.1%
V
=3.3V I =0A
O
IN
V
=3.3V
IN
1.38
1.36
1.34
1.32
-0.2%
-0.3%
-0.4%
-0.5%
V
=5V
IN
0
0.2
0.4
0.6
0.8
1
-50
0
50
100
150
T
(°C)
A
I
(A)
O
FIGURE 5. F vs JUNCTION TEMPERATURE (PWM MODE)
S
FIGURE 6. LOAD REGULATIONS (PWM MODE)
FN7428.6
August 5, 2005
4
INTERSIL [ Intersil ]
