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Low Power-Loss Voltage Regulators
PQ7RV4
PQ7RV4
Variable Output(1.5 to 7V), 4.6A Output Low Power-loss Voltage Regulator
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Features
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Outline Dimensions
10.2MAX 4.50.2
(Unit : mm)
Low power-loss (Dropout voltage: MAX.0.5V at Io=4.0A) (Dropout voltage: MAX.1.0V at Io=4.6A) q TO-220 package q 1.5V to 7V/4.6A output type q Low operating voltage(Minimum operating voltage: 3.0V) q High-precision reference voltage type Reference voltage precision: 2.0% q Built-in ON/OFF control function q Built-in overcurrent protection, overheat protection function
2.80.2
7.40.2
3.60.2
29.1MAX
PQ7RV4
4-1.4 +0.3 -0
13.5MIN
4-0.6 +0.2 -0.1
(1.5)
3-(2.54)
(0.5)
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Applications
Power supplies for various electronic equipment such as personal computers
Internal connection diagram
Control circuit

DC input(VIN) DC output(VO) GND Output adjustment terminal(VADJ)
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Absolute Maximum Ratings
Parameter Symbol VIN VADJ IO PD1 PD2 Tj Topr Tstg Tsol
(Ta=25C) Rating 10 5 4.6 1.8 18 150 -20 to +80 -40 to +150 260(For 10s) Unit V V A W C C C C
Input voltage 1 ON/OFF control terminal voltage Output current
2 3
Power dissipation Junction temperature Operating temperature Storage temperature Soldering temperature
1 2 3
All are open except GND and applicable terminals. PD1: No heat sink, PD2: With infinite heat sink Overheat protection may operate at 125<=Tj<=150C.
*Please refer to the chapter " Handling Precautions ".
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 device specification sheets before using any SHARP device. Internet Internet address for Electronic Components Group http://sharp-world.com/ecg/
Notice
15.60.5
o3.20.1
4.8MAX
Low Power-Loss Voltage Regulators
PQ7RV4
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Electrical Characteristics
Parameter
(Unless otherwise specified, conditions shall be VIN=5V,VO=3.3V(R1=2k),Io=2.0A,Ta=25C) Symbol VIN VO RegL RegI Vref TCVref RR Vi-O(1) Vi-O(2) Iq Conditions - - IO=5mA to 4.6A VIN=4 to 10V - Tj=0 to125C Refer to Fig. 2 4, IO=4.0A 4, IO=4.6A IO=0A MIN. 3.0 1.5 - - 1.225 - 45 - - - TYP. - - 0.5 0.5 1.25 0.01 55 - - - MAX. 10.0 7.0 2.0 2.5 1.275 - - 0.5 1.0 17 Unit V V % % V %/C dB V V mA
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.
Fig. 1 Test Circuit
VIN 1 2 R2 3 0.33F 4 R1 Iq 2k
+
47F
VO
A
Vref
IO
V
RL
Vo=Vref(1+R2/R1) [R1=2k,Vref Nearly=1.25V]
A
V
Fig. 2 Test circuit for Ripple Rejection
1 ei VIN 0.33F 3 4 R1 2k 2 R2 47F
+ +
IO
f=120Hz(sine wave) ei(rms)=0.5V VO=3V V eo VIN=5V(R1=2k) IO=0.5A RL RR=20 log(ei(rms)/eo(rms))
Fig. 3 Power Dissipation vs. Ambient Temperature
20 PD2
Fig. 4 Reference Voltage Deviation vs. Junction Temperature
Reference voltage deviation Vref (mV)
5 VIN=5V 4 VO=3.3V 3 R1=2k IO=2A 2 1 0 -1 -2 -3 -4 -5 -25 0 25 50 75 100 Junction temperature Tj (C) 125
Power dissipation PD (W)
15
10 PD1 :No heat sink PD2 :With infinite heat sink 5 PD1
0 20 40 60 80 Ambient temperature Ta (C) Note) Oblique line portion : Overheat protection may operate in this area.
0 -20
Low Power-Loss Voltage Regulators
Fig. 5 Relative Output Voltage vs. Output Current (Typical Value)
100
PQ7RV4
Fig. 6 Output Voltage vs. Input Voltage
4 Ta =25C RL=1.65 RL= RL=0.72
Relative output voltage (%)
60 40 20 0
Output voltage VO (V)
80
3
2
1
0
2.0 4.0 6.0 8.0 Output current IO (A)
1.0
0
0
1
2 3 4 Input voltage VIN (V)
5
Fig. 7 Circuit Operating Current vs. Input Voltage
Curcuit operating current IBIAS (mA)
120 100 Ta =25C
Fig. 8 Dropout Voltage vs. Junction Temperature
1.0 0.8 0.6 0.4 0.2 0 -25 IO =4.6A IO =4A VO=3.3V R1=2k
50
RL=0.72 RL=1.65 RL=
0 0 1 2 3 4 Input voltage VIN (V) 5
Dropout voltage Vi-O (V)
0 25 50 75 100 Junction temperature Tj (C)
125
Fig. 9 Quiescent Current vs. Junction Temperature
20 VIN =5 18 VO=3.3V 16 R1=2k IO =0A 14 12 10 8 6 4 2 0 -25 0 25 50 75 100 Junction temperature Tj (C) 125
Fig.10 Ripple Rejection vs. Input Ripple Frequency
100 80 60 40 20
Quiescent current Iq (mA)
Ripple rejection RR (dB)
VIN=5V Io=0.5A 0 ei(rms)=0.5V 0.1 1 10 Input ripple frequency f (kHz)
100
Low Power-Loss Voltage Regulators
PQ7RV4
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Standard Connection
D1
VIN
1
2
R2
4
3
+
VO
+
Cref 390 to 5k
CIN
R1
CO
: 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 CrefR2. 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 0.33F and 47F, 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(1+R2/R1) (Vref is 1.25V TYP) The standard value of R1 is 2k. But value up to 390 to 5k does not cause any trouble.
D1
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Setting 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 figure below.
2 R2 - + 3 Vref 4 R1
VO VO=Vrefx(1+R2/R1) (R1=2k,Vref Nearly=1.25V)
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ON/OFF Operation
D1 VADJ
Load
D2
VIN
1
2 R2 4 3 D2
+
VO R1 RL
R2
CIN
VADJ R1
R3
CO
RL VO'
RD
VC
High : Output OFF Low : Output ON Equivalent Circuit in OFF-state
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'=VADJRL/(RL+R2) occurs at the load. OFF-state equivalent circuit R1 up to 5k 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.
NOTICE
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The circuit application examples in this publication are provided to explain representative applications of SHARP devices and are not intended to guarantee any circuit design or license any intellectual property rights. SHARP takes no responsibility for any problems related to any intellectual property right of a third party resulting from the use of SHARP's devices. Contact SHARP in order to obtain the latest device specification sheets before using any SHARP device. SHARP reserves the right to make changes in the specifications, characteristics, data, materials, structure, and other contents described herein at any time without notice in order to improve design or reliability. Manufacturing locations are also subject to change without notice. Observe the following points when using any devices in this publication. SHARP takes no responsibility for damage caused by improper use of the devices which does not meet the conditions and absolute maximum ratings to be used specified in the relevant specification sheet nor meet the following conditions: (i) The devices in this publication are designed for use in general electronic equipment designs such as: - - - Personal computers - -- Office automation equipment - -- Telecommunication equipment [terminal] - - - Test and measurement equipment - - - Industrial control - -- Audio visual equipment - -- Consumer electronics (ii) Measures such as fail-safe function and redundant design should be taken to ensure reliability and safety when SHARP devices are used for or in connection with equipment that requires higher reliability such as: - -- Transportation control and safety equipment (i.e., aircraft, trains, automobiles, etc.) - - - Traffic signals - - - Gas leakage sensor breakers - - - Alarm equipment - -- Various safety devices, etc. (iii)SHARP devices shall not be used for or in connection with equipment that requires an extremely high level of reliability and safety such as: - - - Space applications - -- Telecommunication equipment [trunk lines] - -- Nuclear power control equipment - -- Medical and other life support equipment (e.g., scuba).
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Contact a SHARP representative in advance when intending to use SHARP devices for any "specific" applications other than those recommended by SHARP or when it is unclear which category mentioned above controls the intended use. If the SHARP devices listed in this publication fall within the scope of strategic products described in the Foreign Exchange and Foreign Trade Control Law of Japan, it is necessary to obtain approval to export such SHARP devices. This publication is the proprietary product of SHARP and is copyrighted, with all rights reserved. Under the copyright laws, no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, in whole or in part, without the express written permission of SHARP. Express written permission is also required before any use of this publication may be made by a third party. Contact and consult with a SHARP representative if there are any questions about the contents of this publication.
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