Datasheet

ADP2121
Rev. B | Page 9 of 20
180
160
140
120
100
80
60
40
20
0
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
AUTO MODE SWITCHING THRESHOLD (mA)
07407-014
PWM OPERATION
PFM OPERATION
V
OUT
= 1.82V
Figure 22. Auto Mode Switching Threshold vs. Input Voltage
110
120
130
140
150
160
170
180
190
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
AUTO MODE RISING SWITCHING THRESHOLD (mA)
V
OUT
= 1.8V
V
OUT
= 1.82V
V
OUT
= 1.85V
V
OUT
= 1.875V
V
OUT
= 2.3V
PFM OPERATION
07407-054
Figure 23. Auto Mode Rising Switching Threshold vs. Input Voltage for All
Voltage Options
40
60
80
100
120
140
160
180
200
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
AUTO MODE FALLING SWITCHING THRESHOLD (mA)
V
OUT
= 1.8V
V
OUT
= 1.82V
V
OUT
= 1.85V
V
OUT
= 1.875V
V
OUT
= 2.3V
PWM OPERATION
07407-055
Figure 24. Auto Mode Falling Switching Threshold vs. Input Voltage for All
Voltage Options
07407-022
TIME (20µs/DIV)
OUTPUT VOLTAGE (50mV/DIV)
LOAD CURRENT (100mA/DIV)
Figure 25. Load Transient Response, 0 mA to 150 mA
(V
IN
= 2.5 V, Auto Mode)
07407-023
TIME (20µs/DIV)
OUTPUT VOLTAGE (50mV/DIV)
LOAD CURRENT (100mA/DIV)
Figure 26. Load Transient Response, 0 mA to 150 mA
(V
IN
= 3.6 V, Auto Mode)
07407-024
TIME (20µs/DIV)
OUTPUT VOLTAGE (50mV/DIV)
LOAD CURRENT (100mA/DIV)
Figure 27. Load Transient Response, 0 mA to 150 mA
(V
IN
= 4.5 V, Auto Mode)