Low Power-Loss Voltage Regulators
PQ3RF43
PQ3RF43
3.3V/4.6V Output Low Power-Loss Voltage Regulator
■ Features
¡Low power-loss
(Dropout voltage : MAX.0.5V at Io = 4.0A)
(Dropout voltage : MAX.1.0V at Io = 4.6A)
¡Compact resin full-mold package (TO-220 package)
¡3.3V/4.6A output type
¡High-precision output voltage type
Output voltage precision : ±2.5%
¡Built-in ON/OFF control function
¡Built-in overcurrent protection, overheat protection
function
■ Applications
¡Power supplies for various electronic equipment such as
personal computers
■ Outline Dimensions
10.2MAX
7.4±0.2
PQ3RF43
29.1MAX
13.5MIN
●1 ●2 ●3 ●4
Internal connection diagram
12
Control circuit
3
3.6±0.2
φ3.2±0.1
+0.3
4-1.4
-0
+0.2
4-0.6
-0.1
3-(2.54)
4
(Unit : mm)
4.5±0.2
2.8±0.2
(0.5)
1 DC input (VIN)
2 DC output (V
3 GND
4 ON/OFF control
terminal (V
C
)
4.8MAX
(1.5)
O
)
15.6±0.5
■ Absolute Maximum Ratings
*1
Input voltage
*1
ON/OFF control terminal voltage
Output current
Power dissipation (No heat sink)
Power dissipation (With infinite heat sink)
*2
Junction temperature
Operating temperature
Storage temperature
8 Soldering temperature
*1
All are open except GND and applicable terminals.
*2
Overheat protection may operate at 125=<T
“ In the absence of confirmation by device specification sheets,SHARP takes no responsibility for any defects that may occur in equipment using any SHARP devices
shown in catalogs,data books,etc.Contact SHARP in order to obtain the latest version of the device specification sheets before using any SHARP's device. ”
Parameter Symbol Rating Unit
j
=<150˚C.
V
IN
V
C
I
O
P
D1
P
D2
T
j
T
opr
T
stg
T
sol
(Ta=25˚C)
10
10
4.6
1.8
18
150
-20 to +80
-40 to +150
260 (For 10s.)
V
V
A
W
˚C
˚C
˚C
˚C
· Please refer to the chapter“ Handling Precautions ”.
Low Power-Loss Voltage Regulators
PQ3RF43
■ Electrical Characteristics
(Unless otherwise specified, conditions shall be VIN=5V,IO=2.0A,Ta=25˚C)
Parameter Symbol Conditions
Output voltage
Load regulation
Line regulation
Temperature coefficient of output voltage
Ripple rejection
Dropout voltage (1)
Dropout voltage (2)
*4
ON-state voltage for control
ON-state current for control
OFF-state voltage for control
OFF-state current for control
Quiescent current
*3
Input voltage shall be the value when output voltage is 95% in comparison with the initial value.
*4
In case of opening control terminal4, output voltage turns on.
RegL
R
T
V
Vi-
V
I
C (ON)
V
C (OFF)
I
C (OFF)
V
O
eg
CVO
RR
i-O(1)
O(2)
C (ON)
I
q
I
O
=5mA to 4.6A
I
IN
=4 to 10V
V
j
=0 to 125˚C
T
*3
, IO=4.0A
*3
, IO=4.6A
C
=2.7V
V
C
=0.4V
V
O
=0A
I
Fig.1 Test Circuit
V
IN
0.33µF
●2●1
V
C
●4
●3
A
A
I
q
I
C
47µF
+
V
O
I
O
A
V
R
L
~
-
-
-
-
3.218
-
-
-
45
-
-
2.0
-
-
-
-
3.3
0.5
0.5
±0.02
55
-
-
-
-
-
-
-
3.382
2.0
2.5
-
-
0.5
1.0
-
20
0.8
- 0.4
17
Fig.2 Test Circuit for Ripple Rejection
+
47µF
●2●1
e
i
0.33µF
V
IN
●4
●3
I
O
+
R
V
C
e
V
L
~
f=120Hz (sine wave)
i
=0.5V
e
o
IO=0.5A
RR=20 log (e
rms
UnitMAX.TYP.NIN.
V
%
%
%/˚C
dB
V
V
V
µA
V
mA
mA
i/eo
)
Fig.3 Power Dissipation vs. Ambient
Temperature
20
P
D2
15
(W)
D
10
PD1 :No heat sink
P
D2
:With infinite heat sink
5
Power dissipation P
P
D1
0
-20 0
Ambient temperature Ta (˚C)
Note) Oblique line portion:Overheat protection may
operate in this area.
20 40 60 80
Fig.4 Overcurrent Protection
Characteristics(Typical Value)
100
80
60
40
20
Relative output voltage (%)
0
0 2.0 4.0 6.0 8.0 10.0
Output current IO (A)
Low Power-Loss Voltage Regulators PQ3RF43
Fig.5 Output Voltage Deviation vs.
Junction Temperature
5
V
IN
=5V
4
I
O
=2A
(mV)
O
3
2
1
0
-1
-2
-3
-4
Output voltage deviation ∆V
-5
-25 0 25 50 75 100 125
Junction temperature Tj (˚C)
Fig. 7 Circuit Operating Current vs. Input
Voltage
a
=25˚C
T
120
(mA)
100
BIAS
L
=0.72Ω
50
Circuit operating current I
0
052413
Input voltage V
R
R
L
=1.65Ω
L
=∞
R
IN
(V)
Fig. 6 Output Voltage vs. Input Voltage
4
a =25˚C
T
3
2
1
Output voltage VO (V)
0
012345
L=1.65Ω
R
L=∞
R
L=0.72Ω
R
Input voltage VIN (V)
Fig.8 Dropout Voltage vs. Junction
Temperature
1.0
V
IN
=0.95V
O
0.8
(V)
-O
i
0.6
0.4
Dropout voltage V
0.2
0
-25 0 5025 10075 125
Junction temperature Tj (˚C)
IO =4.6A
I
O
=4A
Fig.9 Quiescent Current vs. Junction
Temperature
20
V
IN
=5V
18
O
=0A
I
16
(mA)
14
q
12
10
8
6
4
Quiescent current I
2
0
-25 0 25 50 75 100 125
Junction temperature Tj (˚C)
Fig.10 Input Ripple Frequency vs. Ripple
Rejection
100
80
60
40
V
IN
=5V
Io=0.5A
20
Ripple rejection RR (dB)
Vo=3.3A
e
i
=0.5V
rms
1
R
0
0.1 101 100
,
=2kΩ
Input ripple frequency f
(kHz)
Low Power-Loss Voltage Regulators
■ Typical Application
PQ3RF43
DC input
0.33µF
●1
Specific IC
ON/OFF Control
O
●2
4
●
●3
V
+
C
O
High or Open :output ON
Low :output OFF
Load
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