Datasheet

ADP1821
Rev. C | Page 7 of 24
TYPICAL PERFORMANCE CHARACTERISTICS
97
87
0
16
LOAD CURRENT (A)
EFFICIENCY (%)
96
95
94
93
92
91
90
89
88
2 4 6 8 10 12 14
1.8V OUTPUT
3.3V OUTPUT
T
A
= 25°C
FREQUENCY = 300kHz
05310-005
Figure 5. Efficiency vs. Load Current, V
IN
= 5 V, V
OUT
= 3.3 V, 1.8 V
94
80
0
16
LOAD CURRENT (A)
EFFICIENCY (%)
92
90
88
86
84
82
2 4 6 8 10 12 14
1.8V OUTPUT
3.3V OUTPUT
T
A
= 25°C
FREQUENCY = 300kHz
05310-006
Figure 6. Efficiency vs. Load Current, V
IN
= 12 V, V
OUT
= 3.3 V, 1.8 V
1400
0
0
6
VCC VOLTAGE (V)
VCC CURRENT (µA)
1200
1000
800
600
400
200
12345
05310-007
Figure 7. VCC Supply Current vs. VCC Voltage
0.6003
0.5996
–50
110
TEMPERATURE (°C)
FEEDBACK VOLTAGE (V)
0.6002
0.6001
0.6000
0.5999
0.5998
0.5997
–30 –10 10 30 50 70 90
05310-008
Figure 8. FB Regulation Voltage vs. Temperature
700
0
–50
100
TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)
600
500
400
300
200
100
050
300kHz
600kHz
05310-009
Figure 9. Switching Frequency vs. Temperature
OUTPUT VOLTAGE
(20mV/DIV)
LOAD CURRENT
(5A/DIV)
0
5310-010
Figure 10. Load Transient Response, 1.5 A to 15 A