LTC3542_15 Datasheet, PDF (5/16 Pages) Linear Technology – 500mA, 2.25MHz Synchronous Step-Down DC/DC Converter

LTC3542
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified.
R_DS(ON) vs Temperature
0.9
0.8
0.7
MAIN SWITCH
0.6
0.5
0.4
0.3
0.2
0.1
0
–50 –25
SYNCHRONOUS
SWITCH
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
0 25 50 75 100 125
TEMPERATURE (°C)
3542 G13
Switch Leakage vs Input Voltage
1000
900
800
700
600
500
MAIN SWITCH
400
300
200
SYNCHRONOUS
SWITCH
100
0
0
1
2
3
4
5
6
V_IN (V)
3542 G14
Switch Leakage vs Temperature
300
250
200
150
100
50
MAIN SWITCH
SYNCHRONOUS SWITCH
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3542 G15
Efficiency vs Input Voltage
100
90
80
70
60
50
40
30
2.5
V_OUT = 1.8V
Burst Mode OPERATION
FIGURE 3a CIRCUIT
I_OUT = 500mA
I_OUT = 100mA
I_OUT = 10mA
I_OUT = 1mA
I_OUT = 0.1mA
3 3.5 4 4.5
INPUT VOLTAGE (V)
5 5.5
3542 G16
Efficiency vs Load Current
100
90
80
70
60
50
40
30
20 _{VOUT = 1.8V}
10 ^{Burst Mode OPERATION}
FIGURE 3a CIRCUIT
0
0.1
1
10
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
100
1000
OUTPUT CURRENT (mA)
3542 G17
Efficiency vs Load Current
100
90
80
70
60
50
40
30
20 _{VOUT = 1.2V}
10 ^{Burst Mode OPERATION}
FIGURE 3a CIRCUIT
0
0.1
1
10
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
100
1000
OUTPUT CURRENT (mA)
3542 G18
Efficiency vs Load Current
100
Burst Mode
90 _OPERATION
80
70
60
50
PULSE SKIP
MODE
40
30
20
10
0
0.1
V_IN = 3.6V
V_OUT = 1.8V
FIGURE 3a CIRCUIT
1
10
100
OUTPUT CURRENT (mA)
1000
3542 G19
3542fa
5