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LTC3547 Datasheet, PDF (4/16 Pages) Linear Technology – Dual Monolithic 300mA Synchronous Step-Down Regulator
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LTC3547
TYPICAL PERFOR A CE CHARACTERISTICS
Oscillator Frequency
vs Temperature
2.6
2.5
2.4
VIN = 4.2V
2.3
VIN = 3.6V
2.2
VIN = 2.7V
2.1
2.0
1.9
1.8
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3547 G04
Reference Voltage
vs Temperature
612
608
604
600
596
592
588
– 50 – 25 0
25 50
TEMPERATURE (°C)
75 100
3547 G07
Efficiency vs Load Current
100
VOUT = 1.2V
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1
10
100
OUTPUT CURRENT (mA)
1000
3547 G10
Switch Leakage vs Temperature
50
40
30
20
SYNCHRONOUS
SWITCH
10
MAIN SWITCH
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3547 G05
RDS(ON) vs Input Voltage
1.0
MAIN SWITCH
0.9
0.8
0.7 SYNCHRONOUS
SWITCH
0.6
0.5
0.4
2.5 3 3.5 4 4.5 5 5.5 6
VIN (V)
3547 G08
Efficiency vs Load Current
100
VOUT = 1.8V
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1
10
100
OUTPUT CURRENT (mA)
1000
3547 G11
Switch Leakage vs Input Voltage
500
400
300
SYNCHRONOUS
SWITCH
200
100
MAIN SWITCH
0
2.5 3 3.5 4 4.5 5 5.5 6
VIN (V)
3547 G06
RDS(ON) vs Temperature
1.3
VIN = 2.7V
1.2
1.1
1.0
VIN = 3.6V
0.9
0.8
0.7
0.6
0.5 VIN = 4.2V
0.4
– 50 – 25 0
MAIN SWITCH
SYNCHRONOUS
SWITCH
25 50 75 100 125
TEMPERATURE (°C)
3547 G09
Efficiency vs Load Current
100
VOUT = 2.5V
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
1
10
100
OUTPUT CURRENT (mA)
1000
3547 G12
3547fa
4
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