Datasheet

ADP2121
Rev. B | Page 6 of 20
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 3.6 V, V
OUT
= 1.82 V, L = 0.47 µH (1800 mA, 1008, LQM2HPNR47MG0L), C
IN
= 2.2 µF (6.3 V, 0402, X5R, GRM155R60J225M),
C
OUT
= 4.7 µF (6.3 V, 0402, X5R, GRM155R60J475ME87D), EN = V
IN
, and T
A
= 25°C, unless otherwise noted.
100
90
80
70
60
50
40
30
20
10
0
0.1 1 10 100 1000
LOAD CURRENT (mA)
EFFICIENCY (%)
07407-004
AUTO MODE
PWM MODE
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.0V
V
OUT
= 1.82V
Figure 4. Efficiency vs. Load Current
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100 1000
LOAD CURRENT (mA)
V
OUT
= 1.8V
V
OUT
= 1.82V
V
OUT
= 1.85V
V
OUT
= 1.875V
V
OUT
= 2.3V
PWM MODE
AUTO MODE
EFFICIENCY (%)
07407-049
Figure 5. Efficiency vs. Load Current for All Output Voltages
100
90
80
70
60
50
40
30
20
0.1 1 10 100 1000
LOAD CURRENT (mA)
EFFICIENCY (%)
07407-016
AUTO MODE
PWM MODE
L = 0.47µH
1008
L = 0.47µH
0805
L = 0.45µH
0603
V
IN
= 2.7V
V
OUT
= 1.82V
Figure 6. Efficiency vs. Load Current for Various Inductor Sizes
Figure 7. Efficiency vs. Input Voltage (Auto Mode)
75
78
81
84
87
90
93
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
I
NPUT VOLTAGE (V)
EFFICIENCY (%)
I
OUT
= 100mA
V
OUT
= 1.8V
V
OUT
= 1.82V
V
OUT
= 1.85V
V
OUT
= 1.875V
V
OUT
= 2.3V
07407-050
Figure 8. Efficiency vs. Input Voltage for All Output Voltages (Auto Mode)
100
95
90
85
80
75
70
65
60
55
50
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1
5.5
INP
UT VOLTAGE (V)
EFFICIENCY (%)
07407-019
L = 0.47µH
1008
L = 0.47µH
0805
L = 0.45µH
0603
AUTO MODE
V
IN
= 2.7V
VOUT = 1.82V
Figure 9. Efficiency vs. Input Voltage for Various Inductor Sizes