Order this document by MC78BC00/D 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. VOLTAGE REGULATOR WITH EXTERNAL POWER TRANSISTOR SEMICONDUCTOR TECHNICAL DATA MC78BC00 Series Features: • Ultra–Low Supply Current (50 µA) • • • • 5 Standby Mode (0.2 µA) 1 Ultra–Low Dropout Voltage (0.1 V with External Transistor and IO = 100 mA) Excellent Line Regulation (Typically 0.1%/V) N SUFFIX PLASTIC PACKAGE CASE 1212 (SOT–23) High Accuracy Output Voltage (±2.5%) ORDERING INFORMATION Device MC78BC30NTR MC78BC33NTR MC78BC40NTR MC78BC50NTR Output Voltage Operating Temperature Range Package 3.0 3.3 4.0 5.0 TA = –30° 30° to +80°C 80°C SOT 23 SOT–23 PIN CONNECTIONS Other voltages from 2.0 to 6.0 V, in 0.1 V increments, are available. Consult factory for information. Ground 1 Input 2 Output 3 Vin 4 Ext (Top View) Representative Block Diagram Ext 5 CE 4 2 3 VO Standard Application Q CC 4 Vref Input 1 CE 3 2 Output MC78BCXX Gnd Cin 1 5 CO 5 This device contains 13 active transistors. This document contains information on a new product. Specifications and information herein are subject to change without notice. MOTOROLA ANALOG IC DEVICE DATA Motorola, Inc. 1996 Rev 0 1 MC78BC00 Series MAXIMUM RATINGS (TC = 25°C, unless otherwise noted.) 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 RθJA 150 333 °C/W Rating mW Operating Junction Temperature TJ 125 °C Operating Ambient Temperature TA –30 to +80 °C Tstg –40 to +125 °C Storage Temperature Range NOTE: ESD data available upon request. ELECTRICAL CHARACTERISTICS (Vin = VO + 1.0 V, IO = 50 mA, TJ = 25°C [Note 1], unless otherwise noted.) Characteristic Output Voltage MC78BC30NTR MC78BC33NTR MC78BC40NTR MC78BC50NTR Symbol Min Typ Max 2.925 3.218 3.900 4.875 3.0 3.3 4.0 5.0 3.075 3.382 4.100 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 Output Current (Note 2) Vin – VO = 1.0 V lO – 1000 – mA Vin – VO – 100 200 mV lss – 50 80 µA lstandby 0.1 0.2 1.0 µA lLK – – 0.5 µA 0 1.5 – – 0.25 8.0 –5.0 – –3.0 – –0.1 0.1 – ±100 – 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 Ext Leakage Current Chip Enable Input Logic Voltage Logic “0” (Regulator “On”) Logic “1” (Regulator “Off”) VCE Chip Enable Input Current VCE = 0.25 V VCE = 1.5 V lCEL Output Voltage Temperature Coefficient TC V µA ppm/°C NOTES: 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. 2 MOTOROLA ANALOG IC DEVICE DATA MC78BC00 Series DEFINITIONS 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 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. Figure 1. Output Voltage versus Input Voltage Figure 2. Output Voltage versus Output Current 4.962 3.2 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 5.0 7.0 6.0 8.0 4.950 4.946 MC78BC50NTR & MJD32C TA = 25°C 100 200 300 400 500 Vin, INPUT VOLTAGE (V) IO, OUTPUT CURRENT (mA) Figure 3. Dropout Voltage versus Output Current Figure 4. Ripple Rejection as a Function of Frequency 600 60 0.40 RR, RIPPLE REJECTION (dB) 0.50 Vin –VO, DROPOUT VOLTAGE (mV) Vin = 5.1 V 4.954 4.942 0 9.0 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 IO, OUTPUT CURRENT (mA) MOTOROLA ANALOG IC DEVICE DATA 1000 1200 0 1.0 k CL = 10 µF IO = 200 mA TA = 25°C MC78BC50NTR & MJD32C 10 k 100 k 1.0 M 10 M 100 M f, FREQUENCY (Hz) 3 MC78BC00 Series Figure 5. Output Voltage versus Temperature Figure 6. Supply Current versus Temperature 60 I ss, SUPPLY CURRENT (mV) 4.98 4.96 4.94 4.92 –30 MC78BC50NTR & MJD32C IO = 100 mA Vin = 6.0 V 0 25 50 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) 40 Input Voltage 7.0 30 20 6.0 10 Output Voltage 0 –10 t, TIME (µs) 4 100 80 Figure 8. Load Transient Response 50 120 –20 140 VO, OUTPUT VOLTAGE DEVIATION (mV) I O , OUTPUT CURRENT (mA) Figure 7. Line Transient Response 80 50 TA, AMBIENT TEMPERATURE (°C) 8.0 5.0 CL = 1.0 µF IO = 100 mA TA = 25°C MC78BC50NTR & MJD32C 4.0 0 20 40 60 25 500 500 400 Output Current 400 300 Vin = 6.0 V TA = 25°C CL = 1.0 µF MC78BC50NTR & MJD32C 200 100 0 300 200 100 –100 Output Voltage 0 –200 –300 0 4.0 8.0 12 16 20 –100 24 t, TIME (µs) MOTOROLA ANALOG IC DEVICE DATA VO, OUTPUT VOLTAGE DEVIATION (mV) VO , OUTPUT VOLTAGE (V) 5.00 MC78BC00 Series APPLICATIONS INFORMATION 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 Ω must be observed over temperature to maintain stability. Introduction 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 µF 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 operation Figure 9. Typical Operation External PNP Transistor 4 Ext 2 VO In Out Vin 3 RA 10 µF Error Amplifier RB Vref Gnd 1 CE MOTOROLA ANALOG IC DEVICE DATA 5 5 MC78BC00 Series 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. 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 Figure 10. External PNP MJD32C In Out R1 10 µF .033 µF R2 4 Ext 3 VO MC78BCXXNTR Figure 11. Typical Application MJD32C .033 µF 10 k 4 Ext In 2 10 µF VDD VO 3 MC78BC50NTR Gnd 1 6 Out 5.0 V 10 µF CE 5 MOTOROLA ANALOG IC DEVICE DATA MC78BC00 Series OUTLINE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 1212 (SOT–23) ISSUE O A 5 E 1 A2 0.05 S B D NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 2. INTERPRET DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994. 3. DATUM C IS A SEATING PLANE. A1 4 2 L 3 E1 L1 B C 5X 0.10 M C B e e1 MOTOROLA ANALOG IC DEVICE DATA S A S C 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 7 MC78BC00 Series Motorola reserves the right to make changes without further notice to any products herein. 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