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| LTC3555 Datasheet, PDF (10/32 Pages) Linear Technology – High Effi ciency USB Power Manager + Triple Step-Down DC/DC | |||
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LTC3555/LTC3555-X
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Regulators 1, 2
Pulse Skip Mode Efï¬ciency
100
90
VOUT1,2 = 2.5V
80
70
VOUT1,2 = 1.2V
60
VOUT1,2 = 1.8V
50
40
30
20
10
0
VIN1,2 = 3.8V
1
10
100
1000
LOAD CURRENT (mA)
3555 G28
Switching Regulator 3
Pulse Skip Mode Efï¬ciency
100
VIN3 = 3.8V
90
80
VOUT3 = 2.5V
70
VOUT3 = 1.2V
60
VOUT3 = 1.8V
50
40
30
20
10
0
1
10
100
1000
LOAD CURRENT (mA)
3555 G31
Switching Regulators 1, 2 Load
Regulation at VOUT1,2 = 1.2V
1.230
VIN1,2 = 3.8V
1.215
Burst Mode
OPERATION
1.200
PULSE SKIP
MODE
1.185
1.170
0.1
FORCED
Burst Mode
OPERATION
1
10
100
LOAD CURRENT (mA)
1000
3555 G34
Switching Regulators 1, 2
Burst Mode Efï¬ciency
100
VOUT1,2 = 2.5V
90
80
VOUT1,2 = 1.2V
70
VOUT1,2 = 1.8V
60
50
40
30
20
10
0
0.1
VIN1,2 = 3.8V
1
10
100
LOAD CURRENT (mA)
1000
3555 G29
Switching Regulator 3
Burst Mode Efï¬ciency
100
VIN3 = 3.8V
90
VOUT3 = 2.5V
80
70
VOUT3 = 1.2V
VOUT3 = 1.8V
60
50
40
30
20
10
0
0.1
1
10
100
LOAD CURRENT (mA)
1000
3555 G32
Switching Regulators 1, 2 Load
Regulation at VOUT1,2 = 1.8V
1.845
VIN1,2 = 3.8V
Burst Mode OPERATION
1.823
PULSE SKIP MODE
1.800
FORCED
Burst Mode
OPERATION
1.778
1.755
0.1
1
10
100
LOAD CURRENT (mA)
1000
3555 G35
Switching Regulators 1, 2
Forced Burst Mode Efï¬ciency
100
VOUT1,2 = 2.5V
90
80
VOUT1,2 = 1.2V
70
VOUT1,2 = 1.8V
60
50
40
30
20
10
0
0.1
VIN1,2 = 3.8V
1
10
100
LOAD CURRENT (mA)
1000
3555 G30
Switching Regulator 3
Forced Burst Mode Efï¬ciency
100
VIN3 = 3.8V
90
VOUT3 = 2.5V
80
VOUT3 = 1.2V
70
VOUT3 = 1.8V
60
50
40
30
20
10
0
0.1
1
10
100
1000
LOAD CURRENT (mA)
3555 G33
Switching Regulators 1, 2 Load
Regulation at VOUT1,2 = 2.5V
2.56
VIN1,2 = 3.8V
2.53 Burst Mode OPERATION
PULSE SKIP MODE
2.50
FORCED
Burst Mode
OPERATION
2.47
2.44
0.1
1
10
100
LOAD CURRENT (mA)
1000
3555 G36
3555fd
10
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