A278RxxPIC LDO Fixed Regulator IC Description The A278Rxx Series is a low dropout voltage regulator suitable for various electronic equipments. It provides constant voltage power source with TO-220F-4SL lead full-mold package. Dropout voltage of A278Rxx Series is below Max.0.5V in full rated current (2.0A). This regulator has various functions such as current limit protection, over voltage protection and output on/off control. Features Pin Connection • 2.0A output low dropout regulator • TO-220F-4SL full-mold package (4pin) 1. INPUT • Current limit protection 2. OUTPUT • Over voltage protection 3. GROUND 1 • Thermal shutdown protection • With output on/off control (At typical 1.5V) 2 34 4. ON/OFF CONTROL • Control pin open or high signal, output on Ordering Information Product Marking Package A278RxxPI(①) A278RxxPIC A278RxxPI TO-220F-4SL YYWW(②) ① Device Code ② Year & Week Code Device Selection Guide Device Output Voltage A278R33PIC 3.3V A278R35PIC 3.5V A278R05PIC 5.0V A278R06PIC 6.0V A278R08PIC 8.0V A278R09PIC 9.0V A278R12PIC 12.0V KSD-I0S003-004 1 A278RxxPIC Block Diagram Absolute Maximum Ratings [Ta=25℃] Characteristic Symbol Rating Unit Input Voltage VI 18(All Others) V 25(A278R12PIC) V VCT 18 V PD1(No Heatsink) 2.0 W PD2(With Heatsink) 20 W Junction Temperature TJ 150 °C Operating Temperature Range Topr -20 ~ 80 °C Storage Temperature Range Tstg -55 ~ 150 °C Control Input Voltage Power Dissipation KSD-I0S003-004 2 A278RxxPIC Electrical Characteristics (VI = VO+2V, Io = 1.0A, VCT(High)=2.7V, Ta = 25°C, unless otherwise specified) Electric Characteristic Output Voltage Symbol Conditions VO Min. Typ. Max. Unit A278R33PIC - 3.22 3.3 3.38 V A278R35PIC - 3.41 3.5 3.59 V A278R05PIC - 4.88 5.0 5.12 V A278R06PIC - 5.85 6.0 6.15 V A278R08PIC - 7.80 8.0 8.20 V A278R09PIC - 8.78 9.0 9.22 V A278R12PIC - 11.7 12.0 12.3 V Line Regulation △VO(△VI) Note1, IO=1.0A - 0.5 2.5 % Load Regulation △VO(△IL) 5mA≤IO≤2.0A - 0.1 2.0 % Quiescent Current IQC IO=0mA - - 10 mA Ripple Rejection Ratio RR (VO+2V)≤VI≤12V, IO=50mA f=120Hz 45 55 - dB - 0.3 V VDROP IO=1.0A - Dropout Voltage IO=2.0A - - 0.5 V Control Voltage High VCT(High) IO=0mA, Output ON 2.0 - - V Control Voltage Low VCT(Low) IO=0mA, Output OFF - - 0.8 V Control Bias Current High ICT(High) VCT(High) = 2.7V - - 20 μA Control Bias Current Low ICT(Low) VCT(Low) = 0.4V - - -0.4 mA Note 1. A278R33: VI=4.3V~12V A278R35: VI=4.5V~12V A278R05: VI=6V~12V A278R06: VI=7V~15V A278R08: VI=9V~16V A278R09: VI=10V~16V A278R12: VI=12V~16V ◈ Test Circuit of A278RxxPIC ㎌ ㎌ KSD-I0S003-004 3 A278RxxPIC Electrical Characteristic Curves Fig.1 IO vs. VO Fig.2 Ta vs. PD 25 Power dissipation PD [W] Relative Output Voltage [%] 100 80 60 40 20 20 15 10 5 Without Heat Sink A278RxxPIC 0 0 0 0.8 1.6 2.4 3.2 4.0 0 4.8 Output Current IO [A] 25 100 125 150 Fig.4 VI vs. IQC 30 30 A278R33PIC VI=0V~12V 24 Quiescent Current IQC [mA] Quiescent Current IQC [mA] 75 Ambient Temperature Ta [˚C] Fig.3 VI vs. IQC 18 12 6 IO=0.0A 0 0 2 4 6 8 10 A278R05PIC VI=0V~12V 24 18 12 IO=2.0A 6 IO=1.0A IO=0.0A 0 12 0 2 Input Voltage VI [V] 4 6 12 Fig.7 VI vs. IQC 30 A278R08PIC VI=0V~15V 24 18 12 6 Quiescent Current IQC [mA] 30 A278R09PIC VI=0V~15V 24 18 12 6 IO=0.0A 0 0 10 8 Input Voltage VI [V] Fig.6 VI vs. IQC Quiescent Current IQC [mA] 50 2.5 5.0 7.5 10.0 12.5 IO=0.0A 15.0 Input Voltage VI [V] 0 0 2.5 5.0 7.5 10.0 12.5 15.0 Input Voltage VI [V] KSD-I0S003-004 4 A278RxxPIC Electrical Characteristic Curves Fig.9 Tj vs. IQC Fig.8 VI vs. IQC 5 A278R12PIC VI=0V~20V 40 Quiescent Current IQC [mA] Quiescent Current IQC [mA] 50 30 20 10 IO=0.0A 0 0 8 4 12 16 20 4 3 2 1 0 -25 24 A278RxxPIC IO=0.0A 0 50 75 100 125 Junction Temperature Tj [℃] Input Voltage VI [V] Fig.10 VCT vs. VO Fig.11 Tj vs. VO 5.2 125 100 Output Voltage VO [V] Relative Output Voltage [%] 25 75 50 25 A278R05PIC IO=1.0A 5.1 5.0 4.9 4.8 A278RxxPIC 0 0 0.5 1.0 1.5 2.0 2.5 3.0 4.7 -25 0 25 50 75 100 125 Junction Temperature Tj [℃] Control Voltage VCT [V] KSD-I0S003-004 5 A278RxxPIC Outline Dimension KSD-I0S003-004 6 A278RxxPIC The AUK Corp. products are intended for the use as components in general electronic equipment (Office and communication equipment, measuring equipment, home appliance, etc.). Please make sure that you consult with us before you use these AUK Corp. products in equipments which require high quality and / or reliability, and in equipments which could have major impact to the welfare of human life(atomic energy control, airplane, spaceship, transportation, combustion control, all types of safety device, etc.). AUK Corp. cannot accept liability to any damage which may occur in case these AUK Corp. products were used in the mentioned equipments without prior consultation with AUK Corp.. Specifications mentioned in this publication are subject to change without notice. KSD-I0S003-004 7