Datasheet

LTC3568
4
3568fa
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 100mA
V
OUT
10mV/
DIV
I
L
500mA/
DIV
S
W
2V/DIV
10µs/DIV
3568 G01
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 100mA
V
OUT
10mV/
DIV
I
L
200mA/
DIV
S
W
2V/DIV
2µs/DIV
3568 G02
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 100mA
V
OUT
10mV/
DIV
I
L
500mA/
DIV
2µs/DIV
3568 G03
S
W
2V/DIV
Typical perForMance characTerisTics
Burst Mode Operation Pulse Skipping Mode Forced Continuous Mode
Efficiency
vs Load Current Efficiency vs V
IN
Load Step
LOAD CURRENT (mA)
EFFICIENCY (%)
100
95
90
85
80
75
70
1 100 1000 10000
3568 G04
10
V
IN
= 3.3V
V
OUT
= 2.5V
CIRCUIT OF FIGURE 7
Burst Mode
OPERATION
PULSE SKIP
FORCED CONTINUOUS
2.5 3.5 4.5 5.53.0 4.0 5.0 6.0
V
IN
(V)
EFFICIENCY (%)
100
95
90
85
80
75
70
65
60
3568 G05
I
OUT
= 500mA
I
OUT
= 1.8A
V
OUT
= 2.5V
CIRCUIT OF FIGURE 7
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 180mA TO 1.8A
V
OUT
100mV/
DIV
I
L
1A/
DIV
50µs/DIV
3568 G06
1 10 100 1000 10000
LOAD CURRENT (mA)
V
OUT
ERROR (%)
3568 G07
Burst Mode
OPERATION
PULSE SKIP
FORCED
CONTINUOUS
V
IN
= 3.3V
V
OUT
= 1.8V
0.6
0.5
0.4
0.3
0.2
0.1
–0.4
–0.3
–0.2
–0.1
0
2.0 3.0 4.0 5.02.5 3.5 4.5 5.5 6.0
V
IN
(V)
V
OUT
ERROR (%)
0.20
0.15
0.10
0.05
–0.20
–0.15
–0.10
–0.05
0
3568 G08
V
OUT
= 1.8V
I
OUT
= 1.8A
I
OUT
= 500mA
2 3 4 5 6
V
IN
(V)
FREQUENCY VARIATION (%)
10
8
6
4
2
0
–2
–4
–6
–8
–10
3568 G09
V
OUT
= 1.8V
I
OUT
= 1.25A
T
A
= 25°C
Load Regulation Line Regulation Frequency vs V
IN