Datasheet

100 Ps/DIV
5V/DIV
5V/DIV
500
mA/DIV
SW2
SW1
V
OUT_AC
LOAD
200
mv/DIV
100 Ps/DIV
5V/DIV
5V/DIV
200 mV/DIV
500 mA/DIV
SW2
SW1
V
OUT_AC
LOAD
4.0V
3.4V
V
IN
V
OUT_AC
SW2
SW1
100 mV/DIV
5V/DIV
5V/DIV
100 Ps/DIV
3.4V
2.8V
100 mV/DIV
5V/DIV
5V/DIV
100 Ps/DIV
V
IN
V
OUT_AC
SW2
SW1
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
= 2.7V
V
IN
V
OUT_AC
100 Ps/DIV
4.5V
3.7V
100 mV/DIV
5V/DIV
5V/DIV
SW2
SW1
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.
Efficiency at V
OUT
= 5.0V Line Transient in Buck Mode
(Auto Mode) ( V
OUT
= 3.4V, Load = 500mA)
Figure 21. Figure 22.
Line Transient in Boost Mode Line Transient in Buck-Boost Mode
( V
OUT
= 3.4V, Load = 500mA) ( V
OUT
= 3.4V, Load = 500mA)
Figure 23. Figure 24.
Load Transient in Buck Mode Load Transient in Boost Operation
(Forced PWM Mode) (Forced PWM Mode)
V
IN
= 4.2V, V
OUT
= 3.4V, Load = 0-500mA V
IN
= 2.7V, V
OUT
= 3.4V, Load = 0-500mA
Figure 25. Figure 26.
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