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| LTC3543 Datasheet, PDF (3/16 Pages) Linear Technology – 600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum | |||
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LTC3543
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted. (From Figure 1a)
Efï¬ciency vs Input Voltage (VIN)
100
IOUT = 200mA
90
80
IOUT = 600mA
70
IOUT = 10mA
60
50
40 VOUT = 1.8V
2.5 3.0 3.5 4.0 4.5
INPUT VOLTAGE (V)
5.0 5.5
3543 G01
Efï¬ciency vs Load Current
100 Burst Mode
90 ENABLED
VIN = 2.7V
80
70
VIN = 4.2V
60
50
VIN = 3.6V
40
30
20
10
0
0.1
VOUT = 1.2V
1
10
100
1000
LOAD CURRENT (mA)
3543 G02
Efï¬ciency vs Load Current
100 Burst Mode
90 ENABLED
80
70
VIN = 4.2V
60
50
VIN = 3.6V
40
30
20
VIN = 2.7V
10
0
0.1
VOUT = 1.5V
1
10
100
1000
LOAD CURRENT (mA)
3543 G03
Power Loss vs Load Current
500
VOUT = 1.2V
VOUT = 1.5V
400
VOUT = 1.8V
VOUT = 2.5V
300
200
100
0
0.1
1
10
100
1000
LOAD CURRENT (mA)
3543 G04
RDS(ON) vs Input Voltage (VIN)
500
450
400
350
MAIN SWITCH
300
250
SYNCHRONOUS SWITCH
200
150
100
50
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
3543 G07
Efï¬ciency vs Load Current
100 Burst Mode
90 ENABLED
80
70
VIN = 4.2V
60
50
VIN = 3.6V
40
30
20
10
0
0.1
VIN = 2.7V
VOUT = 1.8V
1
10
100
LOAD CURRENT (mA)
1000
3543 G05
Main Switch Resistance vs
Temperature
500
450
VIN = 2.7V
400
VIN = 3.6V
350
300
VIN = 4.2V
250
200
â40 â25 â10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
3543 G08
Efï¬ciency vs Load Current
100 Burst Mode
90 ENABLED
80
70
VIN = 4.2V
60
50
VIN = 3.6V
40
30
20
10
0
0.1
VIN = 2.7V
VOUT = 2.5V
1
10
100
LOAD CURRENT (mA)
1000
3543 G06
Synchronous Switch Resistance
vs Temperature
500
450
400
VIN = 2.7V
VIN = 3.6V
350
300
VIN = 4.2V
250
200
â40 â25 â10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
3543 G09
3543f
3
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