Datasheet

500 Ps/DIV
5V/DIV
5V/DIV
50
mv/DIV
500
mA/DIV
SW2
SW1
V
OUT_AC
LOAD
500 Ps/DIV
2V/DIV
2V/DIV
50
mv/DIV
500
mA/DIV
SW2
SW1
V
OUT_AC
LOAD
5 Ps/DIV
5V/DIV
5V/DIV
50
mv/DIV
500
mA/DIV
SW2
SW1
V
OUT_AC
LOAD
200 ns/DIV
5V/DIV
5V/DIV
50
mv/DIV
500
mA/DIV
SW2
SW1
V
OUT_AC
LOAD
LM3668
SNVS449M –JUNE 2007–REVISED MAY 2013 www.ti.com
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.
Typical Switching Waveform in Buck Mode Typical Switching Waveform in Boost Mode
(PFM Mode) (PWM Mode)
V
IN
= 3.6V, V
OUT
= 3.0V, Load = 50mA V
IN
= 3V, V
OUT
= 3.4V, Load = 500mA
Figure 39. Figure 40.
Typical Switching Waveform in Buck Mode Typical Switching Waveform in Boost Mode
(PWM Mode) (PFM Mode)
V
IN
= 4V, V
OUT
= 3.4V, Load = 500mA V
IN
= 3V, V
OUT
= 3.4V, Load = 50mA
Figure 41. Figure 42.
Typical Switching Waveform in Buck Mode
(PFM Mode) Start up in PWM Mode
V
IN
= 4V, V
OUT
= 3.4V, Load = 50mA (V
OUT
= 3.4V, Load = 1mA)
Figure 43. Figure 44.
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