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LTC3549
4
3549f
INPUT VOLTAGE (V)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
3549 G03
0
1.5 2.5 3.5 4.5 5.5
0.1mA
1mA
I
OUT
:
10mA
100mA
300mA
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3549 G04a
0
1
0.1
0.01
0.001
0.0001
1
POWER LOSS (W)
V
IN
= 2.5V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 3.6V
EFFICIENCY
POWER LOSS
L = 4.7µH
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3549 G04b
0
1
V
IN
= 2.5V
V
IN
= 3.6V
V
IN
= 4.2V
EFFICIENCY
L = 4.7µH
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3549 G05a
0
1
V
IN
= 1.6V
V
IN
= 2.5V
V
IN
= 3.1V
TEMPERATURE (ºC)
–50
0.6069
REFERENCE VOLTAGE (V)
0.6090
0.6111
0.6132
–25 0 25 50
3549 G06
75 100 125
V
IN
= 1.6V
V
IN
= 2.2V
V
IN
= 4.2V
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3549 G05b
0
1
V
IN
= 1.6V
V
IN
= 2.5V
V
IN
= 3.1V
INPUT VOLTAGE (V)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
3549 G02
0
1.5 2.5 3.5 4.5 5.5
0.1mA
1mA
10mA
100mA
300mA
I
OUT
:
Effi ciency/Power Loss vs Load
Current, V
OUT
= 1.5V, Burst Mode
Effi ciency/Power Loss vs Load
Current, V
OUT
= 1.5V, Pulse Skip
Effi ciency vs Input Voltage
V
OUT
= 1.2V, Burst Mode Operation
Effi ciency vs Input Voltage
V
OUT
= 1.2V, Pulse Skip
Effi ciency vs Load Current
V
OUT
= 1.8V, Burst Mode
Effi ciency vs Load Current
V
OUT
= 1.8V, Pulse Skip
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(From Typical Application on the front page, except for the resistive divider resistor values)
Effi ciency vs Load Current
V
OUT
= 1.2V, Burst Mode
Effi ciency vs Load Current
V
OUT
= 1.2V, Pulse Skip
Reference Voltage
vs Temperature
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3549 G01a
0
1
0.1
0.01
0.001
0.0001
1
V
IN
= 1.8V
V
IN
= 2.5V
V
IN
= 3.1V
V
IN
= 1.8V
V
IN
= 2.5V
V
IN
= 3.1V
EFFICIENCY POWER LOSS
POWER LOSS (W)
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3549 G01b
0
1
0.1
0.01
0.001
0.0001
1
POWER LOSS (W)
V
IN
= 1.8V
V
IN
= 2.5V
V
IN
= 3.1V
V
IN
= 1.8V
V
IN
= 2.5V
V
IN
= 3.1V
EFFICIENCY POWER LOSS