Datasheet

4
LTC1879
1879f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Switch Leakage vs Temperature
Efficiency vs Output Current
Efficiency vs Input Voltage
Efficiency vs Output Current
TEMPERATURE (°C)
–50
0
SWITCH LEAKAGE (µA)
2
6
8
10
20
14
0
50
75
1879 G07
4
16
18
12
–25
25
100
125
V
IN
= 10V
MAIN SWITCH
SYNCHRONOUS
SWITCH
INPUT VOLTAGE (V)
0
SWITCH LEAKAGE (nA)
30
40
50
8
1879 G08
20
10
25
35
45
15
5
0
2
4
6
10
RUN = 0V
T
A
= 25°C
SYNCHRONOUS SWITCH
MAIN SWITCH
Switch Leakage vs Input Voltage Output Voltage vs Load Current
LOAD CURRENT (mA)
0
2.41
OUTPUT VOLTAGE (V)
2.42
2.44
2.45
2.46
2.51
2.48
400
800
1000
1879 G09
2.43
2.49
2.50
2.47
200 600
1200
1400
1600
PULSE SKIPPING MODE
V
IN
= 5V
L = 6.2µH
Reference Voltage
vs Temperature
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125
REFERENCE VOLTAGE (mV)
1879 G10
804
803
802
801
800
799
798
797
796
795
794
V
IN
= 6V
OUTPUT CURRENT (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
0.1 10 100
1879 G11
1 1000
V
IN
= 10V
V
IN
= 3.6V
V
OUT
= 1.8V
L = 6.2µH
Burst Mode OPERATION
V
IN
= 5V
V
IN
= 7.2V
OUTPUT CURRENT (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
0.1 10 100
1879 G12
1 1000
V
IN
= 10V
V
IN
= 3.6V
V
OUT
= 2.5V
L = 6.2µH
Burst Mode OPERATION
V
IN
= 7.2V
V
IN
= 5V
Efficiency vs Output Current
OUTPUT CURRENT (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
0.1 10 100
1879 G13
1 1000
V
OUT
= 3.1V
L = 6.2µH
Burst Mode OPERATION
PULSE SKIPPING MODE
V
IN
= 4.2V
V
IN
= 4.2V
V
IN
= 7.2V
V
IN
= 7.2V
INPUT VOLTAGE (V)
2
70
80
100
8
1879 G14
60
0.1mA
1mA
100mA 10mA
50
46 10
40
30
90
EFFICIENCY (%)
V
OUT
= 2.5V
L = 6.2µH
Burst Mode OPERATION