Datasheet PQ7RV4 Datasheet (Sharp)

Low Power-Loss Voltage Regulators PQ7RV4

PQ7RV4

Variable Output (1.5 to 7V), 4.6A 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)

¡TO-220 package
¡1.5V to 7V/4.6A output type
¡Low operating voltage (Minimum operating voltage:3.0V)
¡High-precision reference voltage type

Reference voltage precision : ±2.0%

¡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

PQ7RV4

29.1MAX

13.5MIN

●1 ●2 ●3 ●4

Internal connection diagram

1

Control circuit

3

φ3.2±0.1

4-1.4

4-0.6

3-(2.54)

2

4

3.6±0.2

+0.3

-0

+0.2

-0.1

(Unit : mm)

4.5±0.2

2.8±0.2

4.8MAX

15.6±0.5

(1.5)

(0.5)

1 DC input (VIN)
2 DC output (V
3 GND
4 Output adjustment

terminal (V

O)

ADJ)

■ Absolute Maximum Ratings

*1

Input voltage

*1

ON/OFF control terminal voltage
Output current

*2

Power dissipation

*3

Junction temperature
Operating temperature
Storage temperature
Soldering temperature

*1

All are open except GND and applicable terminals.

*2

P

D1

: No heat sink, PD2: With infinite heat sink

*3

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

V

IN

V

ADJ

I

O

P

D1

P

D2

T

j

T

opr

-20 to +80

T

stg

-40 to +150

T

sol

260 (For 10s)

j

=<150˚C.

(Ta=25˚C)

10

5

4.6

1.8
18

150

V
V

A
W
˚C

˚C
˚C
˚C

· Please refer to the chapter“ Handling Precautions ”.

Low Power-Loss Voltage Regulators PQ7RV4

■ Electrical Characteristics

(Unless otherwise specified, conditions shall be VIN=5V,VO=3.3V(R1=2kΩ),Io=2.0A,Ta=25˚C)

Parameter Symbol Conditions
Input voltage
Output voltage
Load regulation
Line regulation
Reference voltage
Temperature coefficient of reference voltage
Ripple rejection
Dropout voltage(1)
Dropout voltage(2)
Quiescent current

*4

Input voltage shall be the value when output voltage is 95% in comparison with the initial value.

V

RegL

R

V

TCV

RR
V
Vi-

V

eg

i-O(1)

I

IN

O

I

ref

ref

O(2)

q

O

=5mA to 4.6A

I

IN

=4 to 10V

V

j

=0 to125˚C

T

*4

, IO=4.0A

*4

, IO=4.6A

O

=0A

I

Fig.1 Test Circuit

V

IN

0.33µF

●2●1

R

2

●4

●3

R

A

Iq2kΩ

V

1

ref

V

47µF

+

V

O

O

I

A

R

V
=1.25

V

[R

L

Fig.2 Test circuit for Ripple Rejection

e

i

~

V

IN

0.33µF

●2●1

R

2

●4

●3

2kΩ

47µF

R

1

+

f=120Hz (sine wave)

I

O

+

R

e
VO=3V

e

o

V

V

~

I

L

RR=20 log (e

-

-

-

-

o

=V

ref X

(1+R2/R1)

X

(1+R2/R1)

1

=2kΩ,Vre=1.25V]

i

=0.5V

rms

IN

=5V (R1=2kΩ)

O

=0.5A

i/eo

7.0

2.0

2.5

0.5

1.0
17

UnitMAX.TYP.

V

V
%
%

V

%/˚C

­dB

-

V
V

mA

MIN.

3.0

1.5

-

-

1.225

-

45

-

-

-

)

-

-

0.5

0.5

1.25

±0.01

55

-

-

-

10.0

1.275

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 Reference Voltage Deviation vs.

Junction Temperature

5

V

IN

=5V

4

O

=3.3V

V

(mV)

O

1

=2kΩ

R

3

O

=2A

I

2
1

0

-1

-2

-3

-4

Reference voltage deviation ∆V

-5

-25 0 25 50 75 100 125
Junction temperature Tj (˚C)

Low Power-Loss Voltage Regulators PQ7RV4

Fig.5 Relative Output Voltage vs. Output

Current (Typical Value)

100

80

60

40

20

Relative output voltage (%)

0

0 2.0 4.0 6.0 8.0 1.0

Output current IO (A)

Fig.7 Circuit Operating Current vs. Input

Voltage

a

=25˚C

T

120

(mA)

100

BIAS

L

=0.72Ω

50

Curcuit operating current I

0

052413

Input voltage V

R

L

=1.65Ω

R

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

O

=3.3V

1

=2kΩ

R

0.8

(V)

-O

i

0.6

I

O

I

O

=4.6A

=4A

0.4

Dropout voltage V

0.2

0

-25 0 5025 10075 125
Junction temperature Tj (˚C)

Fig.9 Quiescent Current vs. Junction

Temperature

20

V

IN

=5

18

O

=3.3V

V

1

=2kΩ

R

16

O

=0A

I

(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 Ripple Rejection vs. Input Ripple

Frequency

100

80

60

40

20

Ripple rejection RR (dB)

VIN=5V
Io=0.5A
e

i=0.5Vrms

0

0.1 101 100
Input ripple frequency f

(kHz)

Low Power-Loss Voltage Regulators PQ7RV4

■ Standard Connection

D

1

V

V

IN

●1

C

IN

●2

●4

●3

+

R

2

C

ref

390Ω

1

R

to5kΩ

+

C

O

D1 : This device is necessary to protect the element from damage when reverse voltage may be applied to the regulator in case of

input short-circuiting.

Cref : This device is necessary when it is required to enhance the ripple rejection or to delay the output start-up time. Otherwise, it

is not necessary.
(Care must be taken since Cref may raise the gain,facilitating oscillation.)
* The output start-up time si proportional to Cref X R2.

CIN,CO : Be sure to mount the devices CIN and CO as close to the device terminal as possible so as to prevent oscillation.

The standard specification of CIN and CO is 0.33µF and 47µF, respectively. However, adjust them as necessary after
checking.

R1,R2 : These devices are necessary to set the output voltage. The output voltage VO is given by the following formula:

VO=Vref X (1+R2/R1)
(Vref is 1.25V TYP)
The standard value of R1 is 2kΩ. But value up to 390Ω to 5kΩ does not cause any trouble.

O

Load

■ Asjustment of Output Voltage

Output voltage is able to set (1.5V to 7V) when resistors R1,R2 are attached to ™, £, ¢ terminals. As for the external
resistors to set output voltage, refer to the following figure.

2

­+

V

ref

4

3

■ ON/OFF Operation

D1

VIN

●1

CIN

●2

R2

●4

●3

R1

VADJ

V

O

2

R

VO=Vref X (1+R2/R1)

R

1

D

2

+

R3

CO

High : Output OFF

VC

Low : Output ON

X (1+R

=1.25

1

=2kΩ,Vref =1.25V)

(R

VO

RL

2

/2000)

ADJ

V

R

R1

Equivalent Circuit
in OFF-state

D2

2

RL

RD

VO’

Low Power-Loss Voltage Regulators PQ7RV4

ON/OFF operation is available by mounting externally D2 and R3.
When VADJ is forcibly raised above Vref (1.25V TYP) by applying the external signal,the output is turned off (pass transistor of
regulator is turned off). When the output is OFF, VADJ must be higher than Vref MAX., and at the same time must be lower than
maximum rating 5V.
In OFF-state, the load current flows to RL from VADJ through R2. Therefore the value of R2 must be as high as possible.
In OFF state, as shown below,voltage
VO'=VADJ X RL/ (RL+R2)
occurs at the load. OFF-state equivalent circuit R1 up to 5kΩ is allowed.
Select as high value of RL and R2 as possible in thisrange. In some case, as output voltage is getting lower (VO<1V), impedance of load
resistance rises. In such condition, it is sometimes impossible to obtain the minimum value of VO'. So add the dummy resistance
indicated by RD in the figure to the circuit parallel to the load.