Datasheet
LTC3127
4
3127f
Typical perForMance characTerisTics
Average Input Current Limit
vs V
IN
(Normalized)
Average Input Current Limit
vs Temperature (Normalized)
Quiescent Current vs V
IN
(Fixed
Frequency Mode–Not Switching)
Burst Mode Quiescent Current
vs V
IN
No Load Input Current vs V
IN
in
Burst Mode Operation
Efficiency vs Load Current Efficiency vs Load Current
Efficiency vs Load Current
(T
J
= 25°C, unless otherwise noted )
V
IN
(V)
1.8
INPUT CURRENT LIMIT (%)
–1
2
2.6
3.4
4.2
–3
–2
–4
–5
1
0
2.2
3
5
3.8
4.6
5.4
3127 G04
V
OUT
= 3.3V
R
PROG
= 32.4k
TEMPERATURE (°C)
–45
INPUT CURRENT LIMIT (%)
–1
2
–15
15
45
–3
–2
–4
–5
1
0
–30
0
75
30
60
90
3127 G05
V
OUT
= 3.3V
R
PROG
= 32.4k
PWM
BURST
LOAD CURRENT (mA)
EFFICIENCY (%)
0.1 10 100 10001
3127 G01
V
IN
= 1.8V
V
IN
= 3.6V
V
IN
= 5V
40
50
60
70
80
30
20
10
0
90
100
V
OUT
= 1.8V
BURST
PWM
LOAD CURRENT (mA)
EFFICIENCY (%)
0.1 10 100 10001
3127 G02
V
IN
= 2.9V
V
IN
= 3.6V
V
IN
= 4.3V
40
50
60
70
80
30
20
10
0
90
100
V
OUT
= 3.3V
10010 100010.1 10000
BURST
PWM
LOAD CURRENT (mA)
EFFICIENCY (%)
3127 G03
V
IN
= 4.5V
V
IN
= 5V
V
IN
= 5.5V
40
50
60
70
80
30
20
10
0
90
100
V
OUT
= 5V
V
IN
(V)
1.8
INPUT CURRENT (µA)
51.5
52.0
4.6
51.0
50.5
2.6 3.4
2.2
3 3.8
5
4.2 5.4
49.0
48.5
50.0
52.5
49.5
3127 G08
V
OUT
= 3.3V
V
IN
(V)
1.8
INPUT CURRENT (µA)
390
410
4.6
370
350
2.6 3.4
2.2
3 3.8
5
4.2 5.4
290
270
330
430
310
3127 G06
V
IN
(V)
1.8
INPUT CURRENT (µA)
35
38
2.6
3.4
4.2
33
34
32
37
36
2.2
3
5
3.8
4.6
5.4
3127 G07