Datasheet

LTC3547
4
3547fa
Effi ciency vs Load Current Effi ciency vs Load Current Effi ciency vs Load Current
TYPICAL PERFOR A CE CHARACTERISTICS
UW
V
IN
(V)
2.5
R
DS(ON)
(Ω)
4
3547 G08
0.9
0.8
0.6
3 3.5 4.5
0.5
0.4
1.0
0.7
5 5.5 6
SYNCHRONOUS
SWITCH
MAIN SWITCH
TEMPERATURE (°C)
–50
R
DS(ON)
(Ω)
1.2
1.1
25
3547 G09
0.8
0.6
–25 0 50
0.5
0.4
1.3
1.0
0.9
0.7
75 100 125
MAIN SWITCH
SYNCHRONOUS
SWITCH
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3547 G10
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
OUT
= 1.2V
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3547 G11
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
OUT
= 1.8V
TEMPERATURE (°C)
–50
V
FB
(mV)
25
3547 G07
604
596
–25 0 50
592
588
612
608
600
75 100
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3547 G12
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
OUT
= 2.5V
TEMPERATURE (°C)
–50
FREQUENCY (MHz)
2.5
25
3547 G04
2.2
2.0
–25 0 50
1.9
1.8
2.6
2.4
2.3
2.1
75 100 125
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 2.7V
TEMPERATURE (°C)
–50
LEAKAGE CURRENT (nA)
25
3547 G05
40
20
–25 0 50
10
0
50
30
75 100 125
SYNCHRONOUS
SWITCH
MAIN SWITCH
V
IN
(V)
2.5
LEAKAGE CURRENT (pA)
4
3547 G06
400
200
3 3.5 4.5
100
0
500
300
5 5.5 6
SYNCHRONOUS
SWITCH
MAIN SWITCH
Oscillator Frequency
vs Temperature
Switch Leakage vs Temperature Switch Leakage vs Input Voltage
Reference Voltage
vs Temperature R
DS(ON)
vs Input Voltage R
DS(ON)
vs Temperature