Analog Devices ADP1148-5 Manuale Utente
Typical Performance Characteristics–ADP1148, ADP1148-3.3, ADP1148-5
–5–
REV. A
MAXIMUM OUTPUT CURRENT – A
200
0
0
5
1
2
3
4
150
100
50
R
SENSE
– m
V
Figure 3. Selecting R
SENSE
vs. Maxi-
mum Output Current
OUTPUT CURRENT – A
EFFICIENCY/LOSS – %
100
95
80
0.01
0.03
3.0
0.1
0.3
1.0
90
85
I
Q
GATE CHARGE
I
2
R
Figure 6. Typical Efficiency Losses
LOAD CURRENT – A
D
V
OUT
– mV
60
40
–60
0
0.5
2.5
1.0
1.5
2.0
20
0
–20
–40
FIGURE 1 CIRCUIT
V
IN
= 6V
V
IN
= 12V
Figure 9. Load Regulation
L = 50
m
H
R
SENSE
= 0.02
V
L = 25
m
H
R
SENSE
= 0.02
V
L = 50
m
H
R
SENSE
= 0.05
V
(V
IN
–V
OUT
) VOLTAGE – V
1000
800
0
0
5
2
3
4
1
600
400
200
C
OUT
–
m
F
Figure 5. Selecting Minimum Output
Capacitor vs. (V
IN
–V
OUT
) and Inductor
D
V
OUT
– mV
V
IN
+40
+20
–60
0
4
16
6
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
Change vs. Input Voltage
V
SHUTDOWN
= 2V
INPUT VOLTAGE – V
SUPPLY CURRENT –
m
A
30
0
4
6
20
8
10
12
14
16
18
25
20
15
10
5
Figure 11. Supply Current in Shutdown
FREQUENCY – kHz
1000
0
0
300
100
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
Timing Capacitor Value
INPUT VOLTAGE – V
100
86
80
0
20
4
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
4
6
20
ACTIVE MODE
SLEEP MODE
8
10
12
14
16
18
1.4
0.8
0.6
0.4
0.2
1.2
1.0
Figure 10. DC Supply Current