Datasheet

LOAD (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
0 1 10 100 1000
V
IN
= 5.5V
V
IN
= 3.3V
V
IN
= 3.6V
V
IN
= 2.5V
V
IN
= 2.7V
LOAD (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
0 1 10 100 1000
V
IN
= 5.0V
V
IN
= 3.6V
V
IN
= 2.5V
V
IN
= 2.7V
V
IN
= 5.5V
LOAD (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
0 1 10 100 1000
V
IN
= 5.5V
V
IN
= 5.0V
V
IN
= 3.6V
V
IN
= 2.5V
V
IN
= 2.7V
TEMPERATURE (°C)
ILIMIT (A)
2.00
1.95
1.90
1.85
1.80
1.75
1.70
-40 -20 0 20 40 60 80 100
V
IN
= 3.6V
LOAD (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
0 1 10 100 1000
V
IN
= 5.5V
V
IN
= 5.0V
V
IN
= 3.6V
V
IN
= 2.5V
V
IN
= 2.7V
LM3668
www.ti.com SNVS449M –JUNE 2007–REVISED MAY 2013
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Typical Application Circuit (Figure 1): V
IN
= 3.6V, L = 2.2 µH, C
IN
= 10 µF, C
OUT
= 22 µF
(1)
, T
A
= 25°C , unless otherwise
stated.
ILIMIT
vs.
Temperature Efficiency at V
OUT
= 2.8V
(V
OUT
= 3.4V) (Forced PWM Mode)
Figure 10. Figure 11.
Efficiency at V
OUT
= 2.8V Efficiency at V
OUT
= 3.0V
(Auto Mode) (Forced PWM Mode)
Figure 12. Figure 13.
Efficiency at V
OUT
= 3.0V Efficiency at V
OUT
= 3.3V
(Auto Mode) (Forced PWM Mode)
Figure 14. Figure 15.
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