Datasheet

ADP2121
Rev. B | Page 8 of 20
90
80
75
85
70
65
60
55
50
45
0.1 1 10 100 1000
LOAD CURRENT (mA)
EFFICIENCY (%)
07407-006
AUTO MODE
V
IN
= 3.6V
V
OUT
= 1.82V
T
A
= –40°C
T
A
= +85°C
T
A
= +25°C
Figure 16. Efficiency vs. Load Current Over Temperature
1.87
1.86
1.85
1.84
1.83
1.82
0.1 1 10 100 1000
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
07407-005
AUTO MODE
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.0V
V
OUT
= 1.82V
Figure 17. Output Voltage Accuracy (Auto Mode)
360
340
320
300
280
260
240
220
200
180
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
N-CHANNEL R
DSON
(mΩ)
07407-015
T
A
= –40°C
T
A
= +85°C
T
A
= +25°C
Figure 18. N-Channel Drain-Source On Resistance
100
90
80
70
60
50
40
30
20
10
0
250
200
150
100
50
0
0.1 1 10 100 1000
LOAD CURRENT (mA)
EFFICIENCY (%)
POWER LOSS (mW)
07407-009
EFFICIENCY
V
OUT
= 1.82 V
POWER
LOSS
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.0V
Figure 19. Efficiency and Power Loss vs. Load Current (Auto Mode)
1.835
1.830
1.825
1.820
1.815
1 10 100 1000
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
07407-008
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
PWM MODE
V
IN
= 5.0V
V
OUT
= 1.82V
Figure 20. Output Voltage Accuracy (PWM Mode)
400
350
300
250
200
150
100
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
P-CHANNEL R
DSON
(mΩ)
07407-012
T
A
= –40°C
T
A
= +85°C
T
A
= +25°C
Figure 21. P-Channel Drain-Source On Resistance