Datasheet

4
LTC1875
1875f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
LOAD CURRENT (mA)
0 500 1000 1500 2000
OUTPUT VOLTAGE (V)
1875 G07
1.84
1.82
1.80
1.78
1.76
1.74
1.72
1.70
Burst Mode OPERATION
V
IN
= 3.6V
L = 4.7µH
Output Voltage vs Load Current
Load Step (Burst Mode Operation)
V
OUT
100mV/DIV
I
L
1A/DIV
I
TH
1V/DIV
50µs/DIV
1875 G08
V
IN
= 3.6V C
IN
= 22µF
V
OUT
= 1.5V C
OUT
= 47µF
L = 6.8µHI
LOAD
= 200mA to 1700mA
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125
REFERENCE VOLTAGE (mV)
1875 G13
805
804
803
802
801
800
799
798
797
796
795
V
IN
= 6V
OUTPUT CURRENT (mA)
EFFICIENCY (%)
95
90
85
80
75
70
65
60
55
50
0.1 10 100
1875 G14
1 1000
V
IN
= 6V
V
IN
= 4.2V
V
IN
= 3V
V
IN
= 3.6V
V
OUT
= 1.8V
L = 4.7µH
Burst Mode OPERATION
OUTPUT CURRENT (mA)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
10
0
0.1 10 100
1875 G15
1 1000
V
IN
= 3.6V
V
OUT
= 1.8V
L = 4.7µH
Burst Mode OPERATION
PULSE SKIPPING MODE
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 4.2V
INPUT VOLTAGE (V)
EFFICIENCY (%)
100
95
90
85
80
75
70
65
60
55
50
2
1875 G16
3 4 5 6
V
OUT
= 2.5V
L = 6.8µH
Burst Mode OPERATION
100mA
1mA
0.1mA
10mA
Reference Voltage vs
Temperature
Efficiency vs Output Current
Efficiency vs Input Voltage
Efficiency vs Output Current