LTC3549 Datasheet, PDF (4/16 Pages) Linear Technology – 250mA Low VIN Buck Regulator in 2mm × 3mm DFN

LTC3549
TYPICAL PERFOR A CE CHARACTERISTICS
(From Typical Application on the front page, except for the resistive divider resistor values)
Efficiency/Power Loss vs Load
Current, V_OUT = 1.5V, Burst Mode
100
1
90
80
0.1
70
60
50
0.01
40
30
0.001
20
10
0
0.1
1
10
100
LOAD CURRENT (mA)
EFFICIENCY
V_IN = 1.8V
V_IN = 2.5V
V_IN = 3.1V
POWER LOSS
V_IN = 1.8V
V_IN = 2.5V
V_IN = 3.1V
0.0001
1000
3549 G01a
Efficiency vs Input Voltage
V_OUT = 1.2V, Pulse Skip
100
90
80
70
60
50
40
30
20
10
0
1.5
I_OUT :
2.5
3.5
4.5
5.5
INPUT VOLTAGE (V)
3549 G03
0.1mA
1mA
10mA
100mA
300mA
Efficiency vs Load Current
V_OUT = 1.2V, Burst Mode
100
90
80
70
60
50
40
30
20
10
0
0.1
V_IN = 1.6V
V_IN = 2.5V
V_IN = 3.1V
1
10
100
LOAD CURRENT (mA)
1000
3549 G05a
4
Efficiency/Power Loss vs Load
Current, V_OUT = 1.5V, Pulse Skip
100
1
90
80
0.1
70
60
50
0.01
40
30
20
10
0
0.1
EFFICIENCY
POWER LOSS ^0.001
V_IN = 1.8V
V_IN = 2.5V
V_IN = 3.1V
V_IN = 1.8V
V_IN = 2.5V
V_IN = 3.1V _0.0001
1
10
100
1000
LOAD CURRENT (mA)
3549 G01b
Efficiency vs Input Voltage
V_OUT = 1.2V, Burst Mode Operation
100
90
80
70
60
50
40
30
I_OUT :
0.1mA
20
1mA
10mA
10
100mA
300mA
0
1.5
2.5
3.5
4.5
INPUT VOLTAGE (V)
5.5
3549 G02
Efficiency vs Load Current
V_OUT = 1.8V, Burst Mode
100
1
L = 4.7µH
90
80
0.1
70
60
50
0.01
40
30
20
10
0
0.1
EFFICIENCY
V_IN = 2.5V
V_IN = 3.6V
V_IN = 4.2V
0.001
POWER LOSS
V_IN = 3.6V
0.0001
1
10
100
1000
LOAD CURRENT (mA)
3549 G04a
Efficiency vs Load Current
V_OUT = 1.8V, Pulse Skip
100
L = 4.7µH
90
80
70
60
50
40
30
20
10
0
0.1
EFFICIENCY
V_IN = 2.5V
V_IN = 3.6V
V_IN = 4.2V
1
10
100
LOAD CURRENT (mA)
1000
3549 G04b
Efficiency vs Load Current
V_OUT = 1.2V, Pulse Skip
100
V_IN = 1.6V
90
V_IN = 2.5V
80
V_IN = 3.1V
70
60
50
40
30
20
10
0
0.1
1
10
100
LOAD CURRENT (mA)
1000
3549 G05b
Reference Voltage
vs Temperature
0.6132
V_IN = 1.6V
V_IN = 2.2V
V_IN = 4.2V
0.6111
0.6090
0.6069
–50 –25
0 25 50 75
TEMPERATURE (ºC)
100 125
3549 G06
3549f