Datasheet

LTC3542
5
3542fa
R
DS(ON)
vs Temperature
Switch Leakage vs Input Voltage
Effi ciency vs Input Voltage
TEMPERATURE (°C)
–50
0
R
DS(ON)
(Ω)
0.1
0.3
0.4
0.5
50
0.9
3542 G13
0.2
0
–25
75 100
25 125
0.6
0.7
0.8
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
SYNCHRONOUS
SWITCH
MAIN SWITCH
Switch Leakage vs Temperature
TEMPERATURE (°C)
–50
SWITCH LEAKAGE (nA)
200
250
300
25 75
3542 G15
150
100
–25 0
50 100 125
50
0
MAIN SWITCH
SYNCHRONOUS SWITCH
V
IN
(V)
0
0
LEAKAGE CURRENT (pA)
200
400
600
1
2
34
3542 G14
5
800
1000
100
300
500
700
900
6
SYNCHRONOUS
SWITCH
MAIN SWITCH
INPUT VOLTAGE (V)
2.5
100
90
80
70
60
50
40
30
45
3542 G16
3 3.5
4.5 5.5
EFFICIENCY (%)
I
OUT
= 500mA
I
OUT
= 100mA
I
OUT
= 10mA
I
OUT
= 1mA
I
OUT
= 0.1mA
V
OUT
= 1.8V
Burst Mode OPERATION
FIGURE 3a CIRCUIT
Effi ciency vs Load Current
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3542 G17
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
OUT
= 1.8V
Burst Mode OPERATION
FIGURE 3a CIRCUIT
Effi ciency vs Load Current Effi ciency vs Load Current
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3542 G18
0
1
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
OUT
= 1.2V
Burst Mode OPERATION
FIGURE 3a CIRCUIT
OUTPUT CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3542 G19
0
1
Burst Mode
OPERATION
V
IN
= 3.6V
V
OUT
= 1.8V
FIGURE 3a CIRCUIT
PULSE SKIP
MODE
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise specifi ed.