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| LTC3539 Datasheet, PDF (4/12 Pages) Linear Technology – 2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converters | |||
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LTC3539/LTC3539-2
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted)
Efï¬ciency vs Load Current and
VIN, VOUT = 1.8V
100
1000
90
80
100
70
EFFICIENCY
60
10
50
POWER LOSS
40
1
30
20
10
0
0.1
VIN = 1V 0.1
VIN = 1.2V
VIN = 1.5V 0.01
1
10
100
1000
LOAD CURRENT (mA)
3539 G01
Efï¬ciency vs Load Current and
VIN, VOUT = 3.3V
100
1000
90
80
100
70
EFFICIENCY
60
50
10
40
30
20
10
0
0.1
POWER LOSS
1
VIN = 1.2V
VIN = 1.8V
VIN = 3V 0.1
1
10
100
1000
LOAD CURRENT (mA)
3539 G02
Efï¬ciency vs Load Current and
VIN, VOUT = 5V
100
1000
90
80
100
70
EFFICIENCY
60
50
10
40
POWER LOSS
30
20
10
0
0.1
1
VIN = 2.4V
VIN = 3.6V
VIN = 4.2V 0.1
1
10
100
1000
LOAD CURRENT (mA)
3539 G03
No Load Input Current vs VIN
100
VOUT = 1.8V
90
VOUT = 2.5V
80
VOUT = 3.3V
VOUT = 5V
70
60
50
40
30
20
10
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VIN (V)
3539 G04
Maximum Output Current vs VIN
2000
1800
1600
1400
1200
1000
800
600
400
VOUT = 1.8V
VOUT = 2.5V
200
VOUT = 3.3V
VOUT = 5V
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VIN (V)
3539 G05
Minimum Load Resistance During
Start-Up vs VIN
10000
VOUT = 3.3V
1000
100
10
0.1
0.65 0.75 0.85 0.95 1.05 1.15
VIN (V)
3539 G06
Burst Mode Threshold Current vs
VIN and VOUT
60
50
40
30
20
VOUT = 1.8V
10
VOUT = 2.5V
VOUT = 3.3V
VOUT = 5V
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
INPUT VOLTAGE (V)
3539 G11
Normalized Current Limit vs VOUT
1.10
1.05
1.00
0.95
0.90
0.85
0.80
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VOUT (V)
3539 G16
3539f
4
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