Datasheet

LTC3548A
5
3548afa
TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage
vs Temperature R
DS(ON)
vs Input Voltage R
DS(ON)
vs Temperature
Efficiency vs Load Current Efficiency vs Load Current Load Regulation
Efficiency vs Load Current Efficiency vs Load Current Line Regulation
T
A
= 25°C unless otherwise specifi ed.
0.615
0.610
0.605
0.600
0.595
0.590
0.585
REFERENCE VOLTAGE (V)
TEMPERATURE (°C)
–50 25 75
3548A G08
–25 0
50 100 125
V
IN
= 3.6V
V
IN
(V)
1
500
450
400
350
300
250
200
46
3548A G09
2
3
57
R
DS(ON)
(mΩ)
MAIN
SWITCH
SYNCHRONOUS
SWITCH
TEMPERATURE (°C)
–50
550
500
450
400
350
300
250
200
150
100
25 75
3548A G10
–25 0
50 100 150125
R
DS(ON)
(mΩ)
MAIN SWITCH
SYNCHRONOUS SWITCH
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 2.7V
LOAD CURRENT (mA)
1
0
EFFICIENCY (%)
30
20
10
70
60
50
40
100
90
80
10 100 1000
3548A G11
2.7V
V
OUT
= 2.5V
Burst Mode OPERATION
FIGURE 3 CIRCUIT
3.3V
4.2V
LOAD CURRENT (mA)
1
0
EFFICIENCY (%)
30
20
10
70
60
50
40
100
90
80
10 100 1000
3548A G12
Burst Mode OPERATION
PULSE-SKIPPING MODE
V
IN
= 3.6V
V
OUT
= 1.8V
NO LOAD ON OTHER CHANNEL
LOAD CURRENT (mA)
1
–4
V
OUT
ERROR(%)
–3
1
0
–1
–2
4
3
2
10 100 1000
3548A G13
Burst Mode OPERATION
PULSE-SKIPPING MODE
V
IN
= 3.6V
V
OUT
= 1.8V
NO LOAD ON OTHER CHANNEL
LOAD CURRENT (mA)
1
0
EFFICIENCY (%)
30
20
10
70
60
50
40
100
90
80
10 100 1000
3548A G14
2.7V
4.2V
V
OUT
= 1.2V
Burst Mode OPERATION
3.3V
LOAD CURRENT (mA)
1
0
EFFICIENCY (%)
30
20
10
70
60
50
40
100
90
80
10 100 1000
3548A G15
2.7V
4.2V
V
OUT
= 1.5V
Burst Mode OPERATION
3.3V
V
IN
(V)
2
V
OUT
ERROR (%)
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
4
6
3548A G16
35
V
OUT
= 1.8V
I
OUT
= 200mA