–Performance Characteristics
ADP1147-3.3/ADP1147-5
1000
800
1000
200
L = 50H
V
= V
= +5V
SENSE
OUT
R
= 0.02⍀
SENSE
800
600
L = 25H
= 0.02⍀
150
100
R
SENSE
600
400
200
0
V
= +12V
IN
400
200
0
L = 50H
= 0.05⍀
R
50
0
V
= +10V
SENSE
IN
V
= +7V
IN
0
100
200
300
0
1
2
3
4
5
0
1
2
3
4
5
(V – V
) VOLTAGE – Volts
FREQUENCY – kHz
MAXIMUM OUTPUT CURRENT – Amps
IN
OUT
Figure 3. Selecting RSENSE vs.
Maxim um Output Current
Figure 4. Operating Frequency vs.
Tim ing Capacitor
Figure 5. Selecting Minim um Output
Capacitor vs. (VIN – VOUT) and Inductor
5.11
100
100
95
FIGURE 1 CIRCUIT
FIGURE 1 CIRCUIT
5.10
2
I R
GATE CHARGE
95
1 AMP
5.09
ADP1147 I
Q
100mA
5.08
90
0.1 AMP
85
5.07
90
SCHOTTKY
DIODE
300mA
5.06
80
75
70
5.05
85
80
5.04
1 AMP
5.03
4
8
12
16
5
8
11
14
17
20
10m
30m
0.1
0.3
– Amps
1
3
INPUT VOLTAGE – V
INPUT VOLTAGE – Volts
I
OUT
Figure 6. Typical Efficiency Losses
Figure 7. Efficiency vs. Input Voltage
Figure 8. ADP1147-5 Output Voltage
vs. Input Voltage
5.11
1.6
1.4
40
35
FIGURE 1 CIRCUIT
5.10
V
= +2V
SHUTDOWN
ACTIVE MODE
1.2
5.09
5.08
30
25
20
15
10
5
1.0
0.8
0.6
0.4
V
= 6 VOLTS
IN
5.07
5.06
5.05
5.04
V
= 12 VOLTS
IN
SLEEP MODE
0.2
5.03
5.02
0
0
0
400
800
1200
1600
2000
4
6
8
10
12
14
16 18 20
4
6
8
10 12 14
16 18
20
LOAD CURRENT – mA
INPUT VOLTAGE – Volts
INPUT VOLTAGE – Volts
Figure 9. Load Regulation
Figure 10. DC Supply Current
Figure 11. Supply Current in
Shutdown
–4–
REV. 0