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| LTC3543_15 Datasheet, PDF (3/20 Pages) Linear Technology – 600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum | |||
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ELECTRICAL CHARACTERISTICS
Note 3: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula: TJ = TA + (PD)(64°C/W)
Note 4: The LTC3543 is tested in a proprietary test mode that connects
VFB to the output of the error ampliï¬er. This test mode is equivalent to
continuous mode operation.
LTC3543
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
TYPICAL PERFORMANCE 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
VIN = 2.7V
90 Burst Mode OPERATION
80 ENABLED
70
VIN = 4.2V
60
50
VIN = 3.6V
40
30
20
10
0
0.1
VOUT = 1.2V
1
10
100
LOAD CURRENT (mA)
1000
3543 G02
Efï¬ciency vs Load Current
100
Burst Mode OPERATION
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
LOAD CURRENT (mA)
1000
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
Efï¬ciency vs Load Current
100
Burst Mode OPERATION
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
Efï¬ciency vs Load Current
100
Burst Mode OPERATION
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
3543fa
3
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