LTC1879_15 Datasheet, PDF (4/20 Pages) Linear Technology – 1.2A Synchronous Step-Down Regulator with 15A Quiescent Current

LTC1879
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Leakage vs Temperature
20
18 ^{VIN = 10V}
16
14
12
MAIN SWITCH
10
8
6
4
SYNCHRONOUS
SWITCH
2
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
1879 G07
Switch Leakage vs Input Voltage
50
RUN = 0V
45 T_A = 25°C
40
35
30
25
MAIN SWITCH
20
15
10
5
SYNCHRONOUS SWITCH
0
0
2
4
6
8
10
INPUT VOLTAGE (V)
1879 G08
Output Voltage vs Load Current
2.51
2.50
2.49
2.48
2.47
2.46
2.45
2.44
2.43 _{PULSE SKIPPING MODE}
2.42 ^VIN ^{= 5V}
L = 6.2µH
2.41
0 200 400 600 800 1000 1200 1400 1600
LOAD CURRENT (mA)
1879 G09
Reference Voltage
vs Temperature
804
V_IN = 6V
803
802
801
800
799
798
797
796
795
794
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1879 G10
Efficiency vs Output Current
100
90 _{VIN = 3.6V}
80
70
V_IN = 5V
V_IN = 7.2V
60
V_IN = 10V
50
40
30
0.1
V_OUT = 1.8V
L = 6.2µH
Burst Mode OPERATION
1
10
100
OUTPUT CURRENT (mA)
1000
1879 G11
Efficiency vs Output Current
100
90 ^{VIN = 3.6V}
80
V_IN = 5V
70
V_IN = 7.2V
60
V_IN = 10V
50
40
30
0.1
V_OUT = 2.5V
L = 6.2µH
Burst Mode OPERATION
1
10
100
OUTPUT CURRENT (mA)
1000
1879 G12
Efficiency vs Output Current
100
90 ^{VIN = 7.2V VIN = 4.2V}
80
70
V_IN = 4.2V
60
50
V_IN = 7.2V
40
30
20
10
0
0.1
V_OUT = 3.1V
L = 6.2µH
Burst Mode OPERATION
PULSE SKIPPING MODE
1
10
100
OUTPUT CURRENT (mA)
1000
1879 G13
Efficiency vs Input Voltage
100
100mA
10mA
90
1mA
80
70
60
0.1mA
50
40
V_OUT = 2.5V
L = 6.2µH
Burst Mode OPERATION
30
2
4
6
8
INPUT VOLTAGE (V)
10
1879 G14
1879f
4