KA378R33 Low Dropout Voltage Regulator - Fairchild Semiconductor
KA378R33 Low Dropout Voltage Regulator - Fairchild Semiconductor
KA378R33 Low Dropout Voltage Regulator - Fairchild Semiconductor
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www.fairchildsemi.com<strong>KA378R33</strong><strong>Low</strong> <strong>Dropout</strong> <strong>Voltage</strong> <strong>Regulator</strong>Features• 3A / 3.3V Output low dropout voltage regulator• TO220 Full-Mold package (4PIN)• Overcurrent protection, Thermal shutdown• Overvoltage protection, Short-Circuit protection• With output disable functionDescriptionThe <strong>KA378R33</strong> is a low-dropout voltage regulator suitablefor various electronic equipments. It provide constant voltagepower source with TO-220 4 lead full mold package.<strong>Dropout</strong> voltage of <strong>KA378R33</strong> is below 0.5V in full ratedcurrent(3A). This regulator has various function such aspeak current protection, thermal shut down, overvoltage protectionand output disable function.TO-220F-4L11. Vin 2. Vo 3. GND 4. VdisInternal Block DiagramVin12VoTHERMAL SHUTDOWNOVERVOLTAGEPROTECTIONBANDGAP REFERENCE-+R1SOA PROTECTIONVdis4HIGH / LOW-+OUTPUTON / OFF1.4VSHORT-CIRCUITSHORTCIRCUITPROTECTIONR23Rev. 1.0.1©2001 <strong>Fairchild</strong> <strong>Semiconductor</strong> Corporation
<strong>KA378R33</strong>Absolute Maximum RatingsParameter Symbol Value Unit RemarkInput <strong>Voltage</strong> Vin 35 V -Disable <strong>Voltage</strong> Vdis 35 V -Output Current Io 3.0 A -Power Dissipation 1 Pd1 1.5 W No HeatsinkPower Dissipation 2 Pd2 15 W With HeatsinkJunction Temperature Tj 150 °C -Operating Temperature Topr -20~80 °C -Electrical Characteristics(Vin=5V, Io=1.5A, Ta=25 °C, unless otherwise specified)Parameter Symbol Conditions Min. Typ. Max. UnitOutput <strong>Voltage</strong> Vo - 3.22 3.3 3.38 VLoad Regulation Rload 5mA < Io < 3A - 0.1 2.0 %Line Regulation Rline 4V < Vin < 10V - 0.5 2.5 %Ripple Rejection Ratio RR note1 45 55 - dB<strong>Dropout</strong> <strong>Voltage</strong> Vdrop Io = 3A - - 0.5 VDisable <strong>Voltage</strong> High VdisH Output Active 2.0 - - VDisable <strong>Voltage</strong> <strong>Low</strong> VdisL Output Disabled - - 0.8 VDisable Bias Current High IdisH Vdis = 2.7V - - 20 µADisable Bias Current <strong>Low</strong> IdisL Vdis = 0.4V - - -0.4 mAQuiescent Current Iq Io = 0A - - 10 mANote:1.These parameters, although guaranteed, are not 100% tested in production.2
<strong>KA378R33</strong>Typical Perfomance Characteristics5.25100Output voltage Vo(V)4.503.753.002.251.500.75RL=8RL=1.1ΩQuiescent Quescent current Iq(mA)80604020RL=800 2 4 6 8 10Input voltage Vin (V)00 2 4 6 8 10Input voltage Vin (V)Figure 1.Output <strong>Voltage</strong> vs. Input <strong>Voltage</strong>Figure 2.Quiescent Current vs. Input <strong>Voltage</strong>5.253.36Output voltage Vo(V)4.503.753.002.251.500.75Output voltage Vo(V)3.343.323.303.283.263.24000.5 1 1.5 2 2.5Disable voltage Vdis (V)33.22-250 25 50 75 100 125TEMPERATURE Tj( o C)Figure 3.Output <strong>Voltage</strong> vs. Disable <strong>Voltage</strong>Figure 4.Output <strong>Voltage</strong> vs. Temperature(Tj)Quiescent Quescent current Iq(mA)108642<strong>Dropout</strong> voltage Vdrop (V)0.60.50.40.30.20.1Io=3A2.0A1.0A0.5A0Junction temperature Tj( o C)0-250 25 50 75 100Junction temperature Tj( o C)125Figure 5.Quiescent Current vs. Temperature(Tj)Figure 6.<strong>Dropout</strong> <strong>Voltage</strong> vs. Junction Temperature3
<strong>KA378R33</strong>Typical Perfomance Characteristics (continued)20100Power dissipation P D(W)D15105Relative output voltage(%)806040200-250 25 50 75 100 125TEMPERATURE Tj( o Ta(°C)00 1.0 2.0 3.0 4.05.0Output Current(A)6.0Figure 7.Power Dissipation vs. Temperature(Ta)Figure 8. Overcurrent Protection Characteristics(Typical Value)4
<strong>KA378R33</strong>Typical ApplicationVin1 2Vo++Vdis43GNDDisable SignalFigure 1.Application Circuit• Ci is required if regulator is located an appreciable distance from power supply filter.• Co improves stability and transient response.(Co > 47µF)5
<strong>KA378R33</strong>Mechanical DimensionsPackageDimensions in millimetersTO-220F-4L6
<strong>KA378R33</strong>Ordering InformationProduct Number Package Operating Temperature<strong>KA378R33</strong> TO-220F-4L -20°C to + 80°C7
<strong>KA378R33</strong>DISCLAIMERFAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANYPRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANYLIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHERDOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.LIFE SUPPORT POLICYFAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICESOR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTORCORPORATION. As used herein:1. Life support devices or systems are devices or systemswhich, (a) are intended for surgical implant into the body,or (b) support or sustain life, and (c) whose failure toperform when properly used in accordance withinstructions for use provided in the labeling, can bereasonably expected to result in a significant injury of theuser.2. A critical component in any component of a life supportdevice or system whose failure to perform can bereasonably expected to cause the failure of the life supportdevice or system, or to affect its safety or effectiveness.www.fairchildsemi.com4/26/01 0.0m 001Stock#DSxxxxxxxx© 2001 <strong>Fairchild</strong> <strong>Semiconductor</strong> Corporation
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