www.fairchildsemi.com MC78XXE 3-Terminal 1A Positive Voltage Regulator Features Description • • • • • The MC78XXE series of three terminal positive regulators are available in the D-PAK package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut down and safe operating area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. Output Current up to 1A Output Voltages of 5, 12V Thermal Overload Protection Short Circuit Protection Output Transistor Safe Operating Area Protection D-PAK GND 1 1. Input 2. GND 3. Output Internal Block Digram INPUT SERIES PASS ELEMENT 1 CURRENT GENERATOR STARTING CIRCUIT REFERENCE VOLTAGE OUTPUT 3 SOA PROTECTION ERROR AMPLIFIER THERMAL PROTECTION GND 2 Rev. 1.0.2 ©2012 Fairchild Semiconductor Corporation MC78XXE Absolute Maximum Ratings Parameter Symbol Value Unit VI 35 V Operating Temperature Range TOPR 0 ~ +125 C Storage Temperature Range TSTG -65 ~ +150 C Input Voltage (for VO = 5V to 18V) Electrical Characteristics (MC7805E) (Refer to test circuit ,0C < TJ < 125C, IO = 500mA, VI = 10V, CI= 0.33F, CO= 0.1F, unless otherwise specified) Parameter Output Voltage Symbol VO Conditions MC7805E/LM7805E Min. Typ. Max. TJ = +25C 4.8 5.0 5.2 5.0mA ≤ Io ≤ 1.0A, PO ≤ 15W VI = 7V to 20V 4.75 5.0 5.25 VO = 7V to 25V - 4.0 100 VI = 8V to 12V - 1.6 50 IO = 5.0mA to1.5A - 9 100 IO =250mA to 750mA - 4 50 Unit V Line Regulation (Note1) Regline TJ = +25C Load Regulation (Note1) Regload TJ = +25C IQ TJ = +25C - 5.0 8.0 IO = 5mA to 1.0A - 0.03 0.5 VI = 7V to 25V - 0.3 1.3 IO = 5mA - -0.8 - mV/C VN f = 10Hz to 100kHz, TA = +25C - 42 - V/Vo RR f = 120Hz VO = 8V to 18V 62 73 - dB IO = 1A, TJ =+25C - 2 - V Quiescent Current Quiescent Current Change IQ Output Voltage Drift (Note2) VO/T Output Noise Voltage Ripple Rejection (Note2) Dropout Voltage VDrop mV mV mA mA Output Resistance (Note2) rO f = 1kHz - 15 - m Short Circuit Current ISC VI = 35V, TA =+25C - 230 - mA Peak Current (Note2) IPK TJ = +25C - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account separately. Pulse testing with low duty is used. 2. These parameters, although guaranteed, are not 100% tested in production. 2 MC78XXE Electrical Characteristics (MC7812E) (Refer to test circuit ,0C < TJ < 125C, IO = 500mA, VI =19V, CI= 0.33F, CO=0.1F, unless otherwise specified) Parameter Output Voltage Symbol VO Conditions MC7812E Min. Typ. Max. TJ = +25C 11.5 12 12.5 5.0mA IO 1.0A, PO 15W VI = 14.5V to 27V 11.4 12 12.6 VI = 14.5V to 30V - 10 240 VI = 16V to 22V - 3.0 120 IO = 5mA to 1.5A - 11 240 IO = 250mA to 750mA - 5.0 120 Unit V Line Regulation (Note1) Regline TJ = +25C Load Regulation (Note1) Regload TJ = +25C IQ TJ = +25C - 5.1 8.0 IO = 5mA to 1.0A - 0.1 0.5 VI = 14.5V to 30V - 0.5 1.0 IO = 5mA - -1 - mV/C - 76 - V/Vo 55 71 - dB IO = 1A, TJ = +25C - 2 - V Quiescent Current Quiescent Current Change IQ Output Voltage Drift (Note2) VO/T Output Noise Voltage VN f = 10Hz to 100kHz, TA = +25C Ripple Rejection (Note2) RR f = 120Hz VI = 15V to 25V Dropout Voltage VDrop mV mV mA mA Output Resistance (Note2) rO f = 1kHz - 18 - m Short Circuit Current ISC VI = 35V, TA= +25C - 230 - mA Peak Current (Note2) IPK TJ = +25C - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 2. These parameters, although guaranteed, are not 100% tested in production. 3 MC78XXE Typical Perfomance Characteristics I 4 Figure 1. Quiescent Current Figure 2. Peak Output Current Figure 3. Output Voltage Figure 4. Quiescent Current MC78XXE Typical Applications 3 1 MC78XXE Input Output 2 CO 0.1uF CI 0.33uF Figure 5. DC Parameters 3 1 MC78XXE Output Input 270pF RL 2 VO 2N6121 OR EQ. 0.33uF OV VO 30uS 100 Figure 6. Load Regulation 5.1 3 1 MC78XXE Input Output 2 0.33uF RL 470uF + 120Hz Figure 7. Ripple Rejection 3 1 MC78XXE Input Output 2 CI 0.33uF CO 0.1uF Figure 8. Fixed Output Regulator 5 MC78XXE 1 Input 3 MC78XXE 2 0.1uF CO IQ 0.33uF Output R1 VXX IO RL VXX + IQ R1 IO = Figure 9. Constant Current Regulator Notes: (1) To specify an output voltage. substitute voltage value for "XX." A common ground is required between the input and the Output voltage. The input voltage must remain typically 2.0V above the output voltage even during the low point on the input ripple voltage. (2) CI is required if regulator is located an appreciable distance from power Supply filter. (3) CO improves stability and transient response. 1 Input 3 Output MC78XXE VXX 2 0.1uF Cl R1 Co IQ 0.33uF R2 IRI 5IQ VO = VXX(1+R2/R1)+IQR2 Figure 10. Circuit for Increasing Output Voltage 1 Input MC7805E 3 Output 2 Cl 0.33uF _ 6 2 0.1uF LM741 3 4 + Co 10k IRI 5IQ VO = VXX(1+R2/R1)+IQR2 Figure 11. Adjustable Output Regulator (7 to 30V) 6 MC78XXE Q1 BD536 Input IQ1 R1 3 1 MC78XXE 3 Output IREG IO 2 0.1uF 0.33uF VBEQ1 R1 = IREG - IQ1/BQ1 IO = IREG+BQ1(IREG - VBEO1/R1) Figure 12. High Current Voltage Regulator Q1 RSC Input Q2 3 R1 Output MC78XXE 3 2 0.1uF 0.33uF Q1 = TIP42 Q2 = TIP42 VBEQ2 RSC= I SC Figure 13. High Output Current with Short Circuit Protection 1 3 VO MC78XXE VI 2 0.33uF 0.1uF 4.7K COMMON 7 6 _ COMMON 2 LM741 + 4 3 4.7K -VIN TIP42 -VO Figure 14. Tracking Voltage Regulator 7 MC78XXE 1 3 MC7815E +20V +15V 2 1N4001 0.1uF 0.33uF 1uF + + 2.2uF 1N4001 1 MC7915E 2 -20V 3 -15V Figure 15. Split Power Supply ( ±15V-1A) Output Input + 0.1uF 2 1 MC78XXE Figure 16. Negative Output Voltage Circuit 1mH Output Input 470 4.7 Z1 1 3 MC78XXE + 0.33uF 2 10uF 0.5 Figure 17. Switching Regulator 8 + 2000uF MC78XXE Mechancal Dimensions Package Dimensions in millimeters D-PAK 9 MC78XXE Ordering Information Product Number MC7805ECDTX MC7812ECDTX Output Voltage Tolerance Package Operating Temperature ±4% D-PAK 0 ~ +125C 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 8/17/12 0.0m 001 Stock#DS400564 2012 Fairchild Semiconductor Corporation