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Typical Performance Characteristics–ADP1148, ADP1148-3.3, ADP1148-5
–5–
REV. A
MAXIMUM OUTPUT CURRENT – A
200
0
0
5
123
4
150
100
50
R
SENSE
– m⍀
Figure 3. Selecting R
SENSE
vs. Maxi-
mum Output Current
OUTPUT CURRENT – A
EFFICIENCY/LOSS – %
100
95
80
0.01 0.03 3.00.1 0.3 1.0
90
85
I
Q
GATE CHARGE
I
2
R
Figure 6. Typical Efficiency Losses
LOAD CURRENT – A
⌬V
OUT
– mV
60
40
–60
0 0.5 2.51.0 1.5 2.0
20
0
–20
–40
FIGURE 1 CIRCUIT
V
IN
= 6V
V
IN
= 12V
Figure 9. Load Regulation
L = 50H
R
SENSE
= 0.02⍀
L = 25H
R
SENSE
= 0.02⍀
L = 50H
R
SENSE
= 0.05⍀
(V
IN
–V
OUT
) VOLTAGE – V
1000
800
0
052341
600
400
200
C
OUT
– F
Figure 5. Selecting Minimum Output
Capacitor vs. (V
IN
–V
OUT
) and Inductor
⌬V
OUT
– mV
V
IN
+40
+20
–60
04 166 8 10 12 14
0
–20
–40
FIGURE 1 CIRCUIT
I
LOAD
= 1A
I
LOAD
= 0.1A
Figure 8. ADP1148-5 Output Voltage
Change vs. Input Voltage
V
SHUTDOWN
= 2V
INPUT VOLTAGE – V
SUPPLY CURRENT – A
30
0
46 2081012141618
25
20
15
10
5
Figure 11. Supply Current in Shutdown
FREQUENCY – kHz
1000
0
0 300100 200
400
200
800
600
V
IN
= 12V
V
IN
= 10V
V
IN
= 7V
V
SENSE
= V
OUT
= 5V
CAPACITANCE – pF
Figure 4. Operating Frequency vs.
Timing Capacitor Value
INPUT VOLTAGE – V
100
86
80
0204 8 12 16
98
88
84
82
92
90
96
94
EFFICIENCY – %
FIGURE 1 CIRCUIT
I
LOAD
= 1A
I
LOAD
= 100mA
Figure 7. Efficiency vs. Input Voltage
INPUT VOLTAGE – V
SUPPLY CURRENT – mA
1.6
0.0
46 20
ACTIVE MODE
SLEEP MODE
8 1012141618
1.4
0.8
0.6
0.4
0.2
1.2
1.0
Figure 10. DC Supply Current