MC78BC00 Series Micropower Voltage Regulator The MC78BC00 voltage regulators are specifically designed to be used with an external power transistor to deliver high current with high voltage accuracy and low quiescent current. The MC78BC00 series are devices suitable for constructing regulators with ultra-low dropout voltage and output current in the range of several tens of mA to hundreds of mA. These devices have a chip enable function, which minimizes the standby mode current drain. Each of these devices contains a voltage reference unit, an error amplifier, a driver transistor and feedback resistors. These devices are available in the SOT-23, 5 pin surface mount packages. These devices are ideally suited for battery powered equipment, and power sources for hand-held audio instruments, communication equipment and domestic appliances. http://onsemi.com VOLTAGE REGULATOR WITH EXTERNAL POWER TRANSISTOR MARKING DIAGRAM 5 5 1 Features • Ultra-Low Supply Current (50 A) • Standby Mode (0.2 A) • Ultra-Low Dropout Voltage (0.1 V with External Transistor and • • IO = 100 mA) Excellent Line Regulation (Typically 0.1%/V) High Accuracy Output Voltage (±2.5%) xx Output Voltage MC78BC30NTR 3.0 MC78BC31NTR 3.1 MC78BC33NTR 3.3 MC78BC40NTR 4.0 MC78BC43NTR 4.3 MC78BC45NTR 4.5 MC78BC50NTR 5.0 Operating Temperature Range 1 = MC78BC30NTR = K0 = MC78BC31NTR = K1 = MC78BC33NTR = K3 = MC78BC40NTR = L0 = MC78BC43NTR = L3 = MC78BC45NTR = L5 = MC78BC50NTR = M0 = Date Code ORDERING INFORMATION Device xx D SOT-23 N SUFFIX PLASTIC PACKAGE CASE 1212 Package D PIN CONNECTIONS TA = -30° to +80°C SOT-23 Other voltages from 2.0 to 6.0 V, in 0.1 V increments, are available. Consult factory for information. Ext 4 2 3 Vin VO Ground 1 Input 2 Output 3 5 CE 4 Ext (Top View) Standard Application Q CC 4 Input 3 2 Output MC78BCXX Vref Cin 1 CE 1 5 CO Gnd 5 This device contains 13 active transistors. Figure 1. Representative Block Diagram Semiconductor Components Industries, LLC, 2003 January, 2003 - Rev. 4 1 Publication Order Number: MC78BC00/D MC78BC00 Series MAXIMUM RATINGS (TC = 25°C, unless otherwise noted.) Rating Symbol Value Unit Input Voltage VCC 10 Vdc Power Dissipation and Thermal Characteristics Maximum Power Dissipation Case 1212 (SOT-23) H Suffix Thermal Resistance, Junction-to-Ambient PD RqJA 150 333 °C/W TJ 125 °C mW Operating Junction Temperature Operating Ambient Temperature TA -30 to +80 °C Storage Temperature Range Tstg -40 to +125 °C NOTE: ESD data available upon request. ELECTRICAL CHARACTERISTICS (Vin = VO + 1.0 V, IO = 50 mA, TJ = 25°C 9 (Note 1), unless otherwise noted.) Characteristic Output Voltage MC78BC30NTR MC78BC31NTR MC78BC33NTR MC78BC40NTR MC78BC43NTR MC78BC45NT4 MC78BC50NTR Symbol Min Typ Max 2.925 3.023 3.218 3.900 4.193 4.386 4.875 3.0 3.1 3.3 4.0 4.3 4.5 5.0 3.075 3.178 3.382 4.100 4.408 4.613 5.125 VO Unit V Line Regulation VO + 0.5 V ≤ Vin ≤ 8.0 V Regline 0 0.1 0.3 mV Load Regulation Vin - VO = 1.0 V 1.0 mA ≤ lO ≤ 100 mA Regload - 40 60 mV lO - 1000 - mA Vin - VO - 100 200 mV lss - 50 80 A lstandby 0.1 0.2 1.0 A Ext Leakage Current lLK - - 0.5 A Chip Enable Input Logic Voltage Logic “0” (Regulator “On”) Logic “1” (Regulator “Off”) VCE 0 1.5 - 0.25 8.0 Chip Enable Input Current VCE = 0.25 V VCE = 1.5 V lCEL -5.0 - -3.0 - -0.1 0.1 - ±100 - Output Current (Note 2) Vin - VO = 1.0 V Dropout Voltage IO = 100 mA Supply Current Vin = 8.0 V Vin - VO = 1.0 V IO = 0 (at no load) Supply Current (Standby) Vin = 8.0 V Output Voltage Temperature Coefficient TC V A ppm/°C 1. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 2. The output current depends upon the performance of External PNP Transistor. Use External PNP Transistor of a low saturation type, with an HFE of 100 or more. http://onsemi.com 2 MC78BC00 Series DEFINITIONS such that average chip temperature is not significantly affected. Load Regulation - The change in output voltage for a change in load current at constant chip temperature. Maximum Power Dissipation - The maximum total device dissipation for which the regulator will operate within specifications. Supply Current - Current which is used to operate the regulator chip and is not delivered to the load. Dropout Voltage - The input/output voltage differential at which the regulator output no longer maintains regulation against further reductions in input voltage. Measured when the output drops 100 mV below its nominal value (which is measured at 1.0 V differential), dropout voltage is affected by junction temperature, load current and minimum input supply requirements. Line Regulation - The change in output voltage for a change in input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques 3.2 4.962 3.0 VO, OUTPUT VOLTAGE (V) VO, OUTPUT VOLTAGE (V) IO = 0 mA IO = 100 mA 2.8 IO = 500 mA 2.6 2.4 MC78BC30NTR TA = 25°C 2.2 2.0 3.0 4.0 7.0 6.0 5.0 8.0 Vin = 5.1 V 4.954 4.950 MC78BC50NTR & MJD32C TA = 25°C 4.946 4.942 0 9.0 100 200 400 300 500 600 Vin, INPUT VOLTAGE (V) IO, OUTPUT CURRENT (mA) Figure 1. Output Voltage versus Input Voltage Figure 2. Output Voltage versus Output Current 0.50 60 0.40 RR, RIPPLE REJECTION (dB) Vin −VO, DROPOUT VOLTAGE (mV) Vin = 6.0 V 4.958 TA = 80°C 0.30 TA = 25°C 0.20 TA = −30°C 0.10 50 40 30 20 10 MC78BC50NTR & MJD32C 0 0 200 400 600 800 1000 0 1.0 k 1200 CL = 10 F IO = 200 mA TA = 25°C MC78BC50NTR & MJD32C 10 k 100 k 1.0 M 10 M IO, OUTPUT CURRENT (mA) f, FREQUENCY (Hz) Figure 3. Dropout Voltage versus Output Current Figure 4. Ripple Rejection as a Function of Frequency http://onsemi.com 3 100 M MC78BC00 Series 60 4.98 4.96 4.92 −30 MC78BC50NTR & MJD32C IO = 100 mA Vin = 6.0 V 0 25 50 40 30 20 MC78BC50NTR & MJD32C IO = 0 mA Vin = 6.0 V 10 0 −30 80 0 TA, AMBIENT TEMPERATURE (°C) I O , OUTPUT CURRENT (mA) 8.0 50 40 Input Voltage 7.0 30 20 6.0 10 Output Voltage 0 −10 80 100 50 80 120 Figure 6. Supply Current versus Temperature VO, OUTPUT VOLTAGE DEVIATION (mV) I O , OUTPUT CURRENT (mA) Figure 5. Output Voltage versus Temperature 5.0 CL = 1.0 F IO = 100 mA TA = 25°C MC78BC50NTR & MJD32C 4.0 0 20 40 60 25 TA, AMBIENT TEMPERATURE (°C) 500 500 400 Output Current 400 300 Vin = 6.0 V TA = 25°C CL = 1.0 F MC78BC50NTR & MJD32C 200 100 0 300 200 100 −100 Output Voltage 0 −200 −300 −20 140 0 4.0 8.0 12 16 20 t, TIME (s) t, TIME (s) Figure 7. Line Transient Response Figure 8. Load Transient Response http://onsemi.com 4 VO, OUTPUT VOLTAGE DEVIATION (mV) 4.94 50 I ss, SUPPLY CURRENT (mV) VO , OUTPUT VOLTAGE (V) 5.00 −100 24 MC78BC00 Series APPLICATIONS INFORMATION Introduction operation below 25°C. The bypass capacitors should be mounted with the shortest possible leads or track lengths directly across the regulator input and output terminals. With economical electrolytic capacitors, cold temperature operation can pose a serious stability problem. As the electrolyte freezes, around -30°C, the capacitance will decrease and the equivalent series resistance (ESR) will increase drastically, causing the circuit to oscillate. Quality electrolytic capacitors with extended temperature ranges of -40 ° to +85°C are readily available. Solid tantalum capacitors may be the better choice if small size is a requirement. However, a maximum ESR limit of 3.0 must be observed over temperature to maintain stability. The MC78BC00 series of micropower voltage regulators are specifically designed for ultra-low dropout voltage and an output current which ranges from several tens of mA to several hundreds of mA making them ideal for battery-powered equipment. These regulators also have a chip enable function which minimizes supply current in stand-by mode. An input bypass capacitor is recommended if the regulator is located an appreciable distance (≥ 4 inches) from the input voltage source. These regulators require a 10 F capacitance between the output terminal and ground for stability. Most types of aluminum, tantalum or multilayer ceramic will perform adequately. Solid tantalums or other appropriate capacitors are recommended for External PNP Transistor 4 Ext 2 VO In Out Vin 3 RA 10 F Error Amplifier RB Vref Gnd 1 CE 5 Figure 9. Typical Operation http://onsemi.com 5 MC78BC00 Series External PNP Transistor The external pin of this IC is protected by a current limit circuit from the destruction caused by excess current. The R2 resistor shown in Figure 10 is used for the protection of the external transistor, although this circuit can operate without the resistor. Resistor R2 should be determined via the input voltage, output voltage, output current, temperature and the HFE of the external pass transistor. MJD32C In Out R1 10 F .033 F R2 4 3 Ext VO MC78BCXXNTR Figure 10. External PNP MJD32C .033 F 10 k 4 Ext In 2 10 F VDD VO 3 MC78BC50NTR Gnd CE 1 5 Figure 11. Typical Application http://onsemi.com 6 Out 5.0 V 10 F MC78BC00 Series PACKAGE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 1212-01 (SOT-23) ISSUE O A 5 E 1 A2 0.05 S B D A1 4 2 NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 2. INTERPRET DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994. 3. DATUM C IS A SEATING PLANE. L 3 E1 L1 B e e1 C 5X 0.10 M C B S A S C http://onsemi.com 7 DIM A1 A2 B C D E E1 e e1 L L1 MILLIMETERS MIN MAX 0.00 0.10 1.00 1.30 0.30 0.50 0.10 0.25 2.80 3.00 2.50 3.10 1.50 1.80 0.95 BSC 1.90 BSC 0.20 −−− 0.45 0.75 MC78BC00 Series ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. 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