Datasheet

LTC3548
4
3548fc
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency vs Input Voltage
Oscillator Frequency
vs Supply Voltage
Oscillator Frequency
vs Temperature
Effi ciency vs Load Current
Load Regulation
Line Regulation
Reference Voltage vs Temperature R
DS(ON)
vs Input Voltage R
DS(ON)
vs Junction Temperature
T
A
= 25°C unless otherwise specifi ed.
INPUT VOLTAGE (V)
2
3548 G04
3
456
100
95
90
85
80
75
70
65
60
EFFICIENCY (%)
V
OUT
= 1.8V, CHANNEL 1
Burst Mode OPERATION
CIRCUIT OF FIGURE 3
800mA
10mA
100mA
1mA
2.5
2.4
2.3
2.2
2.1
2.0
FREQUENCY (MHz)
TEMPERATURE (°C)
–50 25 75
3548 G05
–25 0
50 100 125
V
IN
= 3.6V
10
8
6
4
2
0
–2
–4
–6
–8
–10
FREQUENCY DEVIATION (%)
SUPPLY VOLTAGE (V)
2
3548 G06
3
456
0.615
0.610
0.605
0.600
0.595
0.590
0.585
REFERENCE VOLTAGE (V)
TEMPERATURE (°C)
–50 25 75
3548 G07
–25 0
50 100 125
V
IN
= 3.6V
V
IN
(V)
1
500
450
400
350
300
250
200
46
3548 G08
2
3
57
R
DS(ON)
(mΩ)
MAIN
SWITCH
SYNCHRONOUS
SWITCH
T
A
= 25°C
JUNCTION TEMPERATURE (°C)
–50
550
500
450
400
350
300
250
200
150
100
25 75
3548 G09
–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
EFFICIENCY (%)
100
95
90
85
80
75
70
65
60
10 100 1000
3548 G11
V
IN
= 3.6V, V
OUT
= 1.8V
NO LOAD ON OTHER CHANNEL
CHANNEL 1; CIRCUIT OF FIGURE 3
Burst Mode OPERATION
PULSE-SKIPPING MODE
LOAD CURRENT (mA)
1
V
OUT
ERROR (%)
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
10 100 1000
3548 G12
Burst Mode OPERATION
PULSE-SKIPPING MODE
V
IN
= 3.6V, V
OUT
= 1.8V
NO LOAD ON OTHER CHANNEL
CHANNEL 1; CIRCUIT OF FIGURE 3
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
3548 G15
35
V
OUT
= 1.8V
I
OUT
= 200mA
T
A
= 25°C