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Notice
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( 0.9 )
Reference voltage precision : ±2.5%
q
Built-in ON/OFF control function
q
Low dissipation current at OFF-state (Iqs : MAX. 5µA)
q
2.5 MIN.
0.5±
0.2
0.1
( 0.5 )
( 1.7 )
Low power-loss
(Dropout voltage : MAX. 0.5V)
q
Surface mount package (equivalent to SC-63)
q
Variable output voltage (3.0 to 20V)
q
Output current (0.5A :
PQ20WZ51)
(1.0A :
PQ20WZ11)
( 0.5 )
3
5.5
±
0.5
Model No.
Epoxy resin
Low Power-Loss Voltage Regulators
PQ20WZ51/PQ20WZ11
s
(Unless otherwise specified, conditions shall be V
IN
=5V, Vo=3.3V,
❇4
,R
1
=2kΩ, R
2
=500Ω, Vc=2.7V, T
a
=25˚C)
Parameter
Symbol
Conditions
MIN.
TYP.
MAX.
Unit
––
Input voltage
24
––
V
V
IN
3.5
––
Output voltage
V
Vo
20
––
3.0
❇5
Load regulation
%
R
eg
L
2.0
––
––
V
IN
=4 to 10V, Io=5mA
Line regulation
R
eg
I
%
2.5
––
––
Refer to Fig. 2
Ripple rejection
RR
dB
––
60
45
❇4
Reference voltage
V
ref
V
2.706
2.64
2.574
T
j
=0 to 125˚C, Io=5mA
Temperature coefficient of Reference voltage VcV
ref
%
––
±1.0
––
❇4,
6
Dropout voltage
V
i
-o
V
0.5
––
––
Io=0A
Quiescent current
I
q
mA
8
––
––
❇7
ON-state voltage for control
––
Vc(
ON
)
V
––
––
2.0
––
ON-state current for control
Ic(
ON
)
µA
200
––
––
OFF-state voltage for control
Vc(
OFF
) Io=0A
V
0.8
––
––
OFF-state current for control
Io=0A, Vc=0.4V
Ic(
OFF
)
µA
2.0
––
––
Output OFF-state consumption current
Io=0A, Vc=0.4V
I
qs
µA
5.0
––
––
PQ20WZ51:Io=0.3A, PQ20WZ11:Io=0.5A
PQ20WZ51:Io=5mA
to 0.5A,
PQ20WZ11:Io=5mA
to 1.0A
Input voltage shall be the value when output voltage is 95% in comparison with the initial value.
In case of opening control terminal
2
, output voltage turns off.
Electrical Characteristics
❇4
❇5
❇6
❇7
Fig. 1 Test Circuit
V
IN
0.33µF
1
3
Fig. 2 Test Circuit for Ripple Rejection
47µF
R
2
V
ref
R
1
V
V
O
A
I
O
0.33µF
1
3
R
2
ei
V
IN
2
5
4
V
C
2
5
4
+
R
L
47µF
R
1
2kΩ
I
O
+
R
L
V
V
eo
A
I
C
A
I
q
2kΩ
V
C
2.7V
R
2
V
O
=V
ref
X 1+ –––––
R
1
[R
1
=2kΩ,Vref Nearly =2.64V]
f=120Hz(sine wave)
e
i(rms)
=0.5V
I
O
=0.3A
RR=20 log(e
i(rms)
/e
o(rms)
)
V
IN
=5V
V
O
=3.3V(R
1
=2kΩ)
Fig. 3 Power Dissipation vs. Ambient
Temperature
10
8
P
D
P
D
:With infinite heat sink
Fig. 4 Overcurrent Protection
Characteristics (Typical Value)
(PQ20WZ51)
4
V
O
=3.3V
Power dissipation P
D
(W)
Output voltage V
O
(V)
3
5
2
V
i
–O
=0.5V
V
i
–O
=1V
V
i
–O
=2V
V
i
–O
=3V
1
50
80 100
150
0
Ambient temperature T
a
(˚C)
Note) Oblique line portion : Overheat protection may operate in this area.
0
–20
0
0
0.5
1.0
1.5
Output current I
O
(A)
2.0
Low Power-Loss Voltage Regulators
Fig. 5 Overcurrent Protection
Characteristics (Typical Value)
(PQ20WZ11)
4
V
O
=3.3V
V
i
–O
=0.5V
Output voltage V
O
(V)
15
PQ20WZ51/PQ20WZ11
Fig. 6 Output Voltage Adjustment
Characteristics
20
R
1
=2kΩ
Output voltage V
O
(V)
3
V
i
–O
=1V
V
i
–O
=2V
2
V
i
–O
=3V
10
1
5
0
0
0
0.5
1.0
1.5
Output current I
O
(A)
2.0
0.1
1
R
2
(kΩ)
10
100
Fig. 7 Reference Voltage Deviation vs.
Junction Temperature (Typical Value)
Reference voltage deviation
∆V
ref
(mV)
Output voltage V
O
(V)
V
IN
=7V
20
V
O
=3.3V(R
1
=2kΩ,R
2
=0.5kΩ)
15
I
O
=0.3A (PQ20WZ51)
=0.5A (PQ20WZ11)
10
25
Fig. 8 Output Voltage vs. Input Voltage
(PQ20WZ51)
8
7
6
5
4
3
2
1
R
L
=∞Ω
R
L
=11Ω
R
L
=6.6Ω
0
1
2
3
4
5
6
Input voltage V
IN
(V)
7
8
R
1
=2kΩ ,R
2
=0.5kΩ
V
C
=2.7V , C
i
=0.33µF , C
0
=47µF
T
j
=25˚C
5
0
–5
–10
–15
–20
–25
–25
0
25
50
75
100
Junction temperature T
j
(˚C)
125
PQ20WZ51
PQ20WZ11
0
Fig. 9 Output Voltage vs. Input Voltage
(PQ20WZ11)
8
7
6
5
4
3
2
1
0
0
1
2
3
4
5
6
Input voltage V
IN
(V)
7
8
R
L
=∞Ω
R
L
=6.6Ω
R
L
=3.3Ω
R
1
=2kΩ ,R
2
=0.5kΩ
V
C
=2.7V , C
i
=0.33µF , C
0
=47µF
T
j
=25˚C
Fig.10 Dropout Voltage vs. Junction
Temperature (PQ20WZ51)
0.2
0.19
V
IN
=3.135V, Vc=2.7V, R
1
=2kΩ, R
2
=500Ω, I
O
=0.3A
Output voltage V
O
(V)
Dropout voltage V
i
–O
(V)
0.18
0.17
0.16
0.15
0.14
0.13
0.12
0.11
0.1
–25
0
25
50
75
100 125
Junction temperature T
j
(˚C)
Low Power-Loss Voltage Regulators
Fig.11 Dropout Voltage vs. Junction
Temperature (PQ20WZ11)
0.18
0.17
PQ20WZ51/PQ20WZ11
Fig.12 Quiescent Current vs. Junction
Temperature
5
4
3
2
1
0
–25
0
25
50
75 100
Junction temperature T
j
(˚C)
125
V
IN
=5V
I
O
=0A
V
C
=2.7V
R
1
=2kΩ
R
2
=500Ω
Dropout voltage V
i
–O
(V)
0.16
0.15
0.14
0.13
0.12
0.11
0.1
V
IN
=3.135V, Vc=2.7V, R
1
=2kΩ, R
2
=500Ω, I
O
=0.5A
–25
0
25
50
75
100
Junction temperature T
j
(˚C)
125
Fig.13 Ripple Rejection vs. Input Ripple
Frequency
80
75
Ripple rejection RR (dB)
Fig.14 Ripple Rejection vs. Output Current
(PQ20WZ51)
80
75
70
65
60
55
50
45
40
T
j
=25˚C
V
IN
=5V
R
1
=2kΩ
R
2
=0.5kΩ
e
i(rms)
=0.5V
f=120Hz (sine wave)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Output current I
O
(A)
Ripple rejection RR (dB)
70
65
60
55
PQ20WZ51
PQ20WZ11
T
j
=25˚C I
O
=0.3A
45 V
IN
=5V e
i(rms)
=0.5V (sine wave)
R
1
=2kΩ RR=20 log(e
i(rms)
/e
o(rms)
)
R
2
=0.5kΩ
40
0.1
1
10
100
Input ripple frequency f (kHz)
50
Fig.15 Ripple Rejection vs. Output Current
(PQ20WZ11)
80
75
70
65
60
55
50
45
40
T
j
=25˚C
V
IN
=5V
R
1
=2kΩ
R
2
=0.5kΩ
e
i(rms)
=0.5V
f=120Hz (sine wave)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Output current I
O
(A)
Ripple rejection RR (dB)
Fig.16 Circuit Operating Current vs. Input
Voltage (PQ20WZ51)
20
Quiescent current I
q
(mA)
Circuit operating current I
BIAS
(mA)
Vc=2.7V,
R
1
=2kΩ, R
2
=500Ω
(Vo=3.3V)
15
R
L
=6.6Ω
10
R
L
=11Ω
5
R
L
=∞Ω
0
0
1
2
3
4
5
Input voltage V
IN
(V)
6
Low Power-Loss Voltage Regulators
Fig.17 Circuit Operating Current vs. Input
Voltage (PQ20WZ11)
30
25
20
15
R
L
=6.6Ω
10
5
0
R
L
=∞Ω
Circuit operating current I
BIAS
(mA)
PQ20WZ51/PQ20WZ11
Vc=2.7V,
R
1
=2kΩ, R
2
=500Ω
(Vo=3.3V)
R
L
=3.3Ω
0
1
2
3
4
5
6
Input voltage V
IN
(V)
7
8
Fig.18 Power Dissipation vs. Ambient
Temperature
3
Power dissipation P
D
(W)
Cu area 740mm
2
Cu area 180mm
2
Cu area 100mm
2
Cu area 70mm
2
Cu area 36mm
2
2
PWB
PWB
Cu
1
0
–20
Material
: Glass-cloth epoxy resin
Size
: 50 X 50 X 1.6mm
Cu thickness : 35µm
0
20
40
60
80
Ambient temperature T
a
(˚C)
100
s
Typical Application
DC input
Cin
1
3
V
O
R
2
2
V
IN
5
4
C
O
+
R
1
2kΩ
Load
ON/OFF signal
High : Output ON
Low or Open : Output OFF
s
Model Line-ups for Tape-packaged Products
Output current
0.5A output
1.0A output
Sleeve-packaged products Tape-packaged products
High-precision output type High-precision output type
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