Low Power-Loss Voltage Regulators
Fig. 5 Output Voltage Adjustment
Characteristics
8
7
R
1
=2kΩ
PQ7DV10
Fig. 6 Output Voltage Deviation vs. Junction
Temperature
10
6
5
4
3
2
1
0
10
2
10
3
R
2
(Ω)
10
4
Output voltage deviation
∆V
O
(mV)
Output voltage V
O
(V)
V
IN
=5V
8 V
O
=3V(R
1
=2kΩ,R
2
=2.8kΩ)
6 I
O
=2.5A
4
2
0
–2
–4
–6
–8
–10
–25
0
25
50
75
100
Junction temperature T
j
(˚C)
125
Fig. 7 Output Voltage vs. Input Voltage
4
T
j
=25˚C
V
O
=3V(R
1
=2kΩ,R
2
=2.8kΩ)
R
L
=0.6Ω
R
L
=∞
R
L
=0.3Ω
Fig. 8 Circuit Operating Current vs. Input
Voltage
160
Output voltage V
O
(V)
3
Circuit operating current I
BIAS
(mA)
T
j
=25˚C
V
O
=3V(R
1
=2kΩ,R
2
=2.8kΩ)
120
2
80
R
L
=0.3Ω
40
R
L
=0.6Ω
R
L
=∞
0
0
1
2
3
4
Input voltage V
IN
(V)
5
1
0
0
1
2
3
4
Input voltage V
IN
(V)
5
Fig. 9 Dropout Voltage vs. Junction
Temperature
0.5
0.4
0.3
0.2
0.1
0
–25
V
O
=3V(R
1
=2kΩ,R
2
=2.8kΩ)
V
IN
: Input voltage when output voltage
is 95% in comparison with the initial value
Fig.10 Ripple Rejection vs. Junction
Temperature
100
80
60
40
20
V
IN
=7V
V
O
=3V(R
1
=2kΩ,R
2
=2.8kΩ)
I
O
=0.5A,e
i(rms)
=0.5V
f=120Hz
0
25
50
75
100
Junction temperature T
j
(˚C)
125
Dropout voltage V
i–
O
(V)
Ripple rejection RR (dB)
0
25
50
75
100
Junction temperature T
j
(˚C)
125
0
–25
SHARP [ SHARP ELECTRIONIC COMPONENTS ]
