Datasheet

ADP5020
Rev. 0 | Page 11 of 28
V
IN
= 4.5 V, V
OUT1
= 2.8 V, V
OUT2
= V
OUT3
= 1.8 V, I
OUT
= 100 mA, C
4
= C
1
= 10 μF, C
2
= 4.7 μF, C
3
= 1 μF, T
J
= 25°C, unless otherwise noted.
EFF1 (1.1V)
EFF2 (1.2V)
EFF3 (1.3V)
EFF4 (1.4V)
EFF5 (1.5V)
EFF6 (1.6V)
EFF7 (1.7V)
EFF8 (1.8V)
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0 50 100 150 200 250 300
LOAD CURRENT (mA)
EFFICIENCY (%)
07774-012
Figure 12. Buck 2 Efficiency vs. Load Current
07774-013
BUCK 2 OUTPUT = 50mV/DIV
I
LOAD
= 100mA/DIV
TIME = 100µs/DIV
BUCK 2
I
LOAD
Figure 13. Buck 2 Load Transient Response
1.2
1.0
0.8
0.6
0.4
0.2
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
SHUTDOWN CURRENT (µA)
07774-014
I
SHTDN
(µA) @ –40°C
I
SHTDN
(µA) @ +25°C
I
SHTDN
(µA) @ +125°C
Figure 14. Shutdown Current vs. Input Voltage
07774-015
ENABLE
BUCK 2
BUCK 1 OUTPUT = 2V/DIV
BUCK 2 OUTPUT = 1V/DIV
TIME = 5ms/DIV
Figure 15. Startup Sequence of the Three Regulators, Set by Default
07774-016
BUCK 2 OUTPUT = 1V/DIV
SW2 OUTPUT = 2V/DIV
TIME = 500µs/DIV
SW2
BUCK 2
Figure 16. Buck 2 Enable Startup
07774-017
BUCK 1 OUTPUT = 1V/DIV
SW1 OUTPUT = 2V/DIV
TIME = 500µs/DIV
SW1
BUCK 1
Figure 17. Buck 1 Enable Startup