Low Power-Loss Voltage Regulators
PQ20WZ51/PQ20WZ11
Fig. 5 Overcurrent Protection
Fig. 6 Output Voltage Adjustment
Characteristics
Characteristics (Typical Value)
(PQ20WZ11)
20
4
VO=3.3V
R1=2kΩ
Vi–O =0.5V
15
10
3
2
Vi–O =1V
Vi
–O =2V
–O =3V
Vi
5
0
1
0
0
0.5
1.0
1.5
2.0
0.1
1
10
100
Output current I
O
(A)
R2 (kΩ)
Fig. 7 Reference Voltage Deviation vs.
Fig. 8 Output Voltage vs. Input Voltage
(PQ20WZ51)
Junction Temperature (Typical Value)
25
R
1
=2kΩ ,R =0.5kΩ
2
V
V
IN=7V
8
7
6
5
4
3
2
1
0
20
15
10
5
V
C
=2.7V , C
i
=0.33µF , C
0
=47µF
O
=3.3V(R
1
=2kΩ,R =0.5kΩ)
2
Tj
=25˚C
I
O
=0.3A (PQ20WZ51)
=0.5A (PQ20WZ11)
0
PQ20WZ11
RL
=∞Ω
–
5
–10
–15
–20
–25
RL=11Ω
PQ20WZ51
RL
=6.6Ω
–25
0
25
50
75
100 125
(˚C)
0
1
2
3
4
5
6
7
8
Junction temperature T
j
Input voltage VIN (V)
Fig. 9 Output Voltage vs. Input Voltage
(PQ20WZ11)
Fig.10 Dropout Voltage vs. Junction
Temperature (PQ20WZ51)
0.2
R
1
=2kΩ ,R =0.5kΩ
2
8
7
6
5
4
3
2
1
0
V
IN=3.135V, Vc=2.7V, R
1
=2kΩ, R
2
=500Ω, I =0.3A
O
0.19
0.18
0.17
0.16
0.15
0.14
0.13
0.12
0.11
0.1
V
C
=2.7V , C
i
=0.33µF , C
0
=47µF
Tj
=25˚C
R
L
=∞Ω
RL=6.6Ω
RL
=3.3Ω
0
1
2
3
4
5
6
7
8
–25
0
25
50
75
100 125
Input voltage VIN (V)
Junction temperature T
j
(˚C)
SHARP [ SHARP ELECTRIONIC COMPONENTS ]
