www.fairchildsemi.com KA278RXXC-Series 2A Output Low Dropout Voltage Regulators Features Description KA278RXXC-series (33/05/12) The KA278RXXC is a low-dropout voltage regulator suitable for various electronic equipments. It provides constant voltage power source with TO-220-4 lead full mold package. The dropout voltage of KA278RXXC is below 0.5V in full rated current(2A). This regulator has various functions such as a peak current protection, a thermal shut down, an overvoltage protection . * * * * * 3.3V, 5V, 12V output low dropout voltage regulator TO-220 full-mold package (4pin) Overcurrent protection, thermal shutdown Overvoltage protection, short circuit protection With output disable function KA278RA05C * * * * * * TO-220F-4L Nominal 5V output without adjusting Output adjustable between 1.25V and 32V 2A output low dropout voltage regulator TO-220 full-mold package (4pin) Overcurrent protection, thermal shutdown Overvoltage protection, short circuit protection 1 1.Vin 2. Vo 3. GND 4. Vdis - KA278RXXC(33/05/12) 1.Vin 2. Vo 3. GND 4. Vadj - KA278RA05C Internal Block Diagram Vin Q1 1 OVERVOLTAGE PROTECTION THERMAL SHUTDOWN BANDGAP REFERENCE 2 - SOA PROTECTION HIGH / LOW + Q1 1 BANDGAP REFERENCE R1 4 Vin THERMAL SHUTDOWN + Vdis Vo 2 Vo OVERVOLTAGE PROTECTION Rin + SOA PROTECTION OUTPUT ON / OFF 4 Vadj R2 1.4V SHORTCIRCUIT PROTECTION SHORTCIRCUIT PROTECTION 3 3 GND GND (KA278R33/05/12C) Rref (KA278RA05C) Rev. 1.0.3 (c)2011 Fairchild Semiconductor Corporation KA278RXXC-SERIES Absolute Maximum Ratings KA278RXXC, KA278RA05C Parameter Input voltage Disable voltage KA278RXXC Output current Value Unit Remark Vin 35 V - Vdis 35 V - Io 2.0 A - Power dissipation 1 Pd1 1.5 W No heatsink Power dissipation 2 Pd2 15 W With heatsink Tj 150 C - Topr -20 ~ 80 C - Junction temperature Operating temperature 2 Symbol Thermal resistance, junction-to case (note2) Rjc 2.9 C/W - Thermal resistance, junction-to-air (note2) Rja 48.51 C/W - KA278RXXC-SERIES Electrical Characteristics (Vin=Note3, Io=1.0A, Ta=25C , unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. - 3.22 3.3 3.38 - 4.88 5 5.12 - 11.7 12 12.3 KA278R33C Output voltage KA278R05C Vo KA278R12C Unit V Load regulation Rload 5mA < Io < 2A - 0.1 2.0 % Line regulation Rline Note4 - 0.5 2.5 % RR Note1 45 55 - dB Vdrop Io = 2A - - 0.5 V Output active 2.0 - - V Ripple rejection ratio Dropout voltage Disable voltage high KA278RXXC VdisH Disable voltage low KA278RXXC VdisL Output disabled - - 0.8 V Disable bias current high KA278RXXC IdisH Vdis = 2.7V - - 20 A Disable bias current low IdisL Vdis = 0.4V - - -0.4 mA Io = 0A - - 10 mA 1.24 1.27 1.30 V KA278RXXC Quiescent current Reference voltage Iq KA278RA05C Vref - Note: 1.These parameters, although guaranteed, are not 100% tested in production. 2. Junction -to -case thermal resistance test environments. -. Pneumatic heat sink fixture. -. Clamping pressure 60psi through 12mm diameter cylinder. -. Thermal grease applied between PKG and heat sink fixture. 3. KA278R33C : Vin = 5V KA278R05C : Vin = 7V KA278R12C : Vin = 15V 4. KA278R33C : Vin =4 to 10V KA278R05C : Vin=6 to 12V KA278R12C : Vin = 13V to 29V 3 KA278RXXC-SERIES Typical Performance Characteristics KA278R33C 100 Quiescent current Iq(mA) 4.50 3.75 RL= 3.00 8 Output voltage Vo(V) 5.25 2.25 RL=3.3 1.50 80 60 40 20 RL= 0.75 0 0 0 2 4 6 8 0 5 10 10 15 20 Input voltage Vin(V) Input voltage Vin (V) Figure 2. Quiescent Current vs. Input Voltage 5.25 3.36 4.50 3.34 Output voltage Vo(V) Output voltage Vo(V) Figure 1. Output Voltage vs. Input Voltage 3.75 3.00 2.25 1.50 3.32 3.30 3.28 3.26 3.24 0.75 0 0 0.5 1 1.5 2 2.5 3.22 -25 3 0 Disable voltage Vdis (V) Figure 3. Output Voltage vs. Disable Voltage 75 25 50 TEMPERATURE Tj(oC) 100 125 Figure 4. Output Voltage vs. Temperature(Tj) 0.70 0.65 8 Drop out voltage Vdrop [V] Quiescent current Iq(mA) 10 6 4 2 0 -25 0 25 50 75 100 125 o Junction temperature Tj( C) Figure 5. Quiescent Current vs. Temperature(Tj) 4 0.60 0.55 0.50 2.0A 0.45 0.40 0.35 0.30 -25 0 25 50 75 100 125 Junction Temp Tj [] Figure 6. Dropout Voltage vs.Junction Temperature KA278RXXC-SERIES Typical Performance Characteristics (Continued) 100 Relative output voltage(%) Power dissipation PD(W) 20 15 10 5 0 -25 80 60 40 20 0 0 75 25 50 TEMPERATURE Tj(oC) 100 125 Figure 7. Power Dissipation vs. Temperature(Tj) 0 1.0 2.0 3.0 4.0 5.0 6.0 Output Current(A) Figure 8. Overcurrent Protection Characteristics (Typical Value) Output peak current Iop (A) 4.75 4.50 4.25 4.00 3.75 3.50 0 1 2 3 4 5 6 Input-output differential voltage Vin-Vo (V) Figure 9. Output Peak Currenrt vs. Input-Output Differential Voltage 5 KA278RXXC-SERIES Typical Performance Characteristics(Continued) KA278R05C 7 Quiescent current Iq(mA) 100 5 RL= 8 Output voltage Vo(V) 120 6 4 RL=2.5 3 2 80 60 40 20 RL= 1 0 0 5 0 10 0 5 15 10 15 20 Input voltage Vin(V) Input voltage Vin (V) Figure 2. Quiescent Current vs. Input Voltage 7 5.06 6 5.04 Output voltage Vo(V) Output voltage Vo(V) Figure 1. Output Voltage vs. Input Voltage 5 4 3 2 1 0 5.02 5.00 4.98 4.96 4.94 0 0.5 1 1.5 2 2.5 4.92 -25 3 0 Disable voltage Vdis (V) 100 125 Figure 4. Output Voltage vs. Temperature(Tj) 0.70 8 0.65 Drop out voltage Vdrop [V] Quiescent current Iq(mA) Figure 3. Output Voltage vs. Disable Voltage 75 25 50 TEMPERATURE Tj(oC) 6 4 2 0 0.60 0.55 0.50 0.40 0.35 0.30 -25 -25 0 25 50 75 100 125 2.0A 0.45 0 25 50 75 100 125 Junction Temp Tj [] Junction temperature Tj(oC) Figure 5. Quiescent Current vs. Temperature(Tj) 6 Figure 6. Dropout Voltage vs.Junction Temperature KA278RXXC-SERIES Typical Performance Characteristics (Continued) Relative output voltage(%) Power dissipation PD(W) 20 15 10 5 0 -25 80 60 40 20 0 0 75 25 50 TEMPERATURE Tj(oC) 100 125 Figure 7. Power Dissipation vs. Temperature(Tj) 0 1.0 2.0 3.0 4.0 5.0 6.0 Output Current(A) Figure 8. Overcurrent Protection Characteristics (Typical Value) Output peak current Iop (A) 4.75 4.50 4.25 4.00 3.75 3.50 0 1 2 3 4 5 6 Input-output differential voltage Vin-Vo (V) Figure 9. Output Peak Currenrt vs. Input-Output Differential Voltage 7 KA278RXXC-SERIES Typical Performance Characteristics (Continued) 120 15.0 100 RL= Quiescent current Iq(mA) 12.5 8 Output voltage Vo(V) KA278R12C 10.0 RL= 6 7.5 5.0 80 60 40 20 RL= 2.5 0 0 0 5 10 15 20 0 5 25 10 15 20 Input voltage Vin(V) Input voltage Vin (V) Figure 2. Quiescent Current vs. Input Voltage 15.0 Output voltage Vo(V) Output voltage Vo(V) Figure 1. Output Voltage vs. Input Voltage 12.5 10.0 7.5 12.04 12.02 12.00 11.98 11.96 5.0 11.94 2.5 0 0 0.5 1 1.5 2 2.5 3 11.92 -25 0 Disable voltage Vdis (V) Figure 3. Output Voltage vs. Disable Voltage 75 25 50 TEMPERATURE Tj(oC) 100 125 Figure 4. Output Voltage vs. Temperature(Tj) 10 0.65 Drop out voltage Vdrop [V] Quiescent current Iq(mA) 0.70 8 6 4 2 0 -25 0 25 50 75 100 125 Junction temperature Tj(oC) Figure 5. Quiescent Current vs. Temperature(Tj) 8 0.60 0.55 0.50 2.0A 0.45 0.40 0.35 0.30 -25 0 25 50 75 100 125 Junction Temp Tj [] Figure 6. Dropout Voltage vs.Junction Temperature KA278RXXC-SERIES Typical Performance Characteristics (Continued) 100 Relative output voltage(%) Power dissipation PD(W) 20 15 10 5 0 -25 80 60 40 20 0 0 75 25 50 TEMPERATURE Tj(oC) 0 100 125 Figure 7. Power Dissipation vs. Temperature(Tj) 1.0 2.0 3.0 4.0 5.0 6.0 Output Current(A) Figure 8. Overcurrent Protection Characteristics (Typical Value) Output peak peak current current Iop Iop (A) (A) Output 4.75 4.75 4.50 4.50 4.25 4.25 4.00 4.00 3.75 3.75 3.50 3.50 00 11 22 33 44 55 66 Input-output Input-outputdifferential differential voltage voltageVin-Vo Vin-Vo(V) (V) Figure 9. Output Peak Currenrt vs. Input-Output Differential Voltage 9 KA278RXXC-SERIES Typical Performance Characteristics (Continued) KA278RA05C 7 Quiescent current Iq(mA) 100 5 RL= 8 Output voltage Vo(V) 120 6 4 RL=2.5 3 2 80 60 40 20 RL= 1 0 0 5 0 10 0 5 15 10 15 20 Input voltage Vin(V) Input voltage Vin (V) Figure 1. Output Voltage vs. Input Voltage Figure 2. Quiescent Current vs. Input Voltage 10 Quiescent current Iq(mA) Output voltage Vo(V) 5.06 5.04 5.02 5.00 4.98 4.96 8 6 4 2 4.94 4.92 -25 0 0 75 25 50 TEMPERATURE Tj(oC) 100 125 50 75 100 125 20 Power dissipation PD(W) 0.65 Drop out voltage Vdrop [V] 25 Figure 4. Quiescent Current vs. Temperature(Tj) 0.70 0.60 0.55 0.50 2.0A 0.45 0.40 0.35 0 25 50 75 100 125 Junction Temp Tj [] Figure 5. Dropout Voltage vs.Junction Temperature 10 0 Junction temperature Tj(oC ) Figure 3. Output Voltage vs. Temperature(Tj) * Fixed Mode (Vo=5V) 0.30 -25 -25 15 10 5 0 -25 0 75 25 50 TEMPERATURE Tj(oC) 100 125 Figure 6. Power Dissipation vs. Temperature(Tj) KA278RXXC-SERIES Typical Performance Characteristics (Continued) 4.75 80 Output peak current Iop (A) Relative output voltage(%) 100 60 40 20 4.50 4.25 4.00 3.75 3.50 0 0 1.0 2.0 3.0 4.0 5.0 6.0 0 1 2 3 4 5 6 Input-output differential voltage Vin-Vo (V) Output Current(A) Figure 7. Overcurrent Protection Characteristics(Typical value) Figure 8. Output Peak Currenrt vs. Input-Output Differential Voltage 11 KA278RXXC-SERIES Typical Application KA278R33/05/12C Vo Vin 1 2 + + 3 GND 4 Vdis Disable Signal Figure 1. Application Circuit * Ci is required if regulator is located at an appreciable distance from power supply filter. * Co improves stability and transient response.(Co > 47F) KA278RA05 Output Input Vo 1 Vin 2 KA278RA05 GND Ci Vadj 3 R3 4 Co RL R4 R1//R3 ) R1 = 1.8k , R2 = 0.6k R2//R4 Vo = 1.25 ( 1 + Figure 2. Application Circuit (Adjustable Mode) * Ci is required if regulator is located at an appreciable distance from power supply filter. * Co improves stability and transient response.(CO > 47F) 25 20 Variation(%) 15 10 5 0 -5 -10 -50 -25 0 25 50 75 100 125 Junction temperature Tj() Figure 3. Internal Resistor(R1,R2) Variation vs. Temperature(Tj) Output = 5V Input Vo 2 1 Vin KA278RA05 Ci GND 3 Vadj 4 Co RL Figure 4. Application Circuit (Fixed Mode) 12 KA278RXXC-SERIES Mechanical Dimensions Package Dimensions in millimeters TO-220F-4L 13 KA278RXXC-SERIES Mechanical Dimensions (Continued) Package Dimensions in millimeters TO-220F-4L(Forming) 14 KA278RXXC-SERIES Ordering Information Product Number Package Operating Temperature KA278R33CTU KA278R05CTU KA278R12CTU TO-220F-4L -20C to +80C KA278RA05CTU KA278R12CYDTU TO-220F-4L(Forming) DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 9/29/11 0.0m 001 Stock#DSxxxxxxxx (c) 2011 Fairchild Semiconductor Corporation