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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 s 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 s Outline Dimensions 10.2MAX 4.50.2 (Unit : mm) 2.80.2 7.40.2 4.8MAX (0.5) 29.1MAX PQ7RV4 4-1.4 +0.3 -0 13.5MIN 4-0.6 +0.2 -0.1 (1.5) s Applications Power supplies for various electronic equipment such as personal computers 1234 qqqq 3-(2.54) Internal connection diagram 1 Control circuit 2 4 1 DC input (VIN) 2 DC output (VO) 3 GND 4 Output adjustment terminal (VADJ) 3 s Absolute Maximum Ratings Parameter *1 *1 (Ta=25C) Symbol VIN VADJ IO PD1 PD2 Tj Topr Tstg Tsol 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 ON/OFF control terminal voltage Output current Power dissipation Junction temperature Operating temperature Storage temperature Soldering temperature *2 *3 *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= " 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. " 15.60.5 3.20.1 3.60.2 Low Power-Loss Voltage Regulators s Electrical Characteristics Parameter 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 PQ7RV4 (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 *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 shall be the value when output voltage is 95% in comparison with the initial value. Fig.1 Test Circuit VIN 1 q 2 q R2 3 q 0.33F 4 q Vref R1 Iq 2k + 47F VO A V IO V RL Vo=Vref X (1+R2/R1) =1.25 X (1+R2/R1) [R1=2k,Vre=1.25V] A Fig.2 Test circuit for Ripple Rejection 1 q 2 q R2 3 q 0.33F 4 q R1 2k 47F + + ei VIN ~ IO f=120Hz (sine wave) ei=0.5Vrms VO=3V V eo VIN=5V (R1=2k) ~ IO=0.5A RL RR=20 log (ei/eo) Fig.3 20 Power Dissipation vs. Ambient Temperature PD2 Fig.4 Reference voltage deviation VO (mV) Reference Voltage Deviation vs. Junction Temperature 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 0 20 40 60 Ambient temperature Ta (C) 80 Note) Oblique line portion:Overheat protection may operate in this area. Low Power-Loss Voltage Regulators Fig.5 100 Relative output voltage (%) PQ7RV4 Fig.6 4 Relative Output Voltage vs. Output Current (Typical Value) Output Voltage vs. Input Voltage Ta =25C Output voltage VO (V) 80 60 40 3 RL=1.65 RL= RL=0.72 2 20 0 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 Curcuit operating current IBIAS (mA) Circuit Operating Current vs. Input Voltage Ta =25C Fig.8 1.0 0.8 0.6 0.4 Dropout Voltage vs. Junction Temperature VO=3.3V R1=2k 120 100 Dropout voltage Vi-O (V) 50 RL=0.72 RL=1.65 RL= IO =4.6A IO =4A 0.2 0 -25 0 0 1 2 3 4 Input voltage VIN (V) 5 0 25 50 75 100 Junction temperature Tj (C) 125 Fig.9 20 Quiescent current Iq (mA) Quiescent Current vs. Junction Temperature Fig.10 Ripple Rejection vs. Input Ripple Frequency 100 80 12 10 8 6 4 2 0 -25 0 25 50 75 100 Junction temperature Tj (C) 125 Ripple rejection RR (dB) VIN =5 18 VO=3.3V 16 R1=2k IO =0A 14 60 40 20 VIN=5V Io=0.5A 0 ei=0.5Vrms 0.1 1 10 Input ripple frequency f (kHz) 100 Low Power-Loss Voltage Regulators s Standard Connection D1 PQ7RV4 VIN 1 q 2 q R2 4 q 3 q VO + Cref 390 to5k 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 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 0.33F 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 X (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 s Asjustment of Output Voltage Output voltage is able to set (1.5V to 7V) when resistors R1,R2 are attached to TM, , terminals. As for the external resistors to set output voltage, refer to the following figure. 2 R2 + 3 Vref 4 R1 VO VO=Vref X (1+R2/R1) =1.25 X (1+R2/2000) (R1=2k,Vref =1.25V) s ON/OFF Operation D1 VADJ D2 Load + VIN 1 q 2 q R2 4 q 3 q 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'=VADJ X RL/ (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. |
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