ME78M05K3G

ME78M05 3-Terminal 0.5A Positive Voltage Regulator ME78M05 General Description Features ●Output Current up to 0.5A ME78M05 is a three-terminal positive regulator. Internal current limiting, thermal shutdown circuitry and ●Output Voltages of 5V safe-area compensation for the internal pass transistor ●Thermal Overload Protection combine to make these devices remarkably rugged ●Short Circuit Protection under most operating conditions. Maximum output ●Package：TO252 current, with adequate heat- sinking is 500 mA. Pin Configuration 1. Input 2. GND 3. Output Maximum Ratings(Ta=25℃) Parameter Rating Unit Input supply voltage : VIN 35 V MAX. Output current:Iout 500 mA Maximum junction temperature: Tj -25～125 ℃ Storage temperature :Tstr -55～150 ℃ Soldering temperature and time +260（Recommended 10S） ℃ Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. V01 www.microne.com.cn Page 1 of 7 ME78M05 Block Diagram Serise pass Element 1 Input Circuit Generator 3 Output SOA Protection R1 Starting Circuit Reference Voltage Error Amplifier R2 Thermal Protection GND 2 Electrical Characteristics (Io =350mA, VIN=10V,0≤Tj≤125OC, unless otherwise noted) Parameter Symbol Output Voltage VO Conditions Min. Typ. Max. IO=40mA, VIN=10V 4.8 5.0 5.2 IO=5mA～350mA VIN=7V～20V 4.75 5.0 5.25 Unit V Line Regulations LNR VIN=7V～20V,IO=40mA -60 - 60 mV Load Regulation LDR VIN=10V,IO=5mA-500mA -100 - 100 mV Dropout Voltage VDIF Tj=25OC,Io=500mA - 2 - V Output noise Voltage VN f=10Hz to 100KHz - 40 - μV/Vo Ripple Rejection PSRR Tj=25OC,f=120Hz,Io=300mA VIN=8V～20V - 80 - dB Peak Output Current Ipk Tj=25OC - 1000 - mA Quiescent Current IQ Tj=25OC - 3.2 8 mA Quiescent Current Change ΔIQ IO=5mA-350mA - - 0.5 IO=200mA, VIN=8V～20V - - 0.8 mA LNR: Line Regulation. The change in output voltage for a change in the input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that the average chip temperature is not significantly affected. LDR: Load Regulation.The change in output voltage for a change in load current at constant chip temperature. V01 www.microne.com.cn Page 2 of 7 ME78M05 Type Characteristics Io=40mA Ta=25℃ VIN=10V Ta=25℃ Io=200mA Ta=25℃ VIN=10V Ta=25℃ Io=10mA VIN=7V Io=100mA Io=10mA V01 www.microne.com.cn Page 3 of 7 ME78M05 Operation Description ME78M05 is designed with Thermal Overload Protection that shuts down the circuit when subjected to an excessive power overload condition, Internal Short Circuit Protection that limits the maximum current the circuit will pass, and Output Transistor Safe-Area Compensation that reduces the output short circuit current as the voltage across the pass transistor is increased. In many low current applications, compensation capacitors are not required. However, it is recommended that the regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter with long wire lengths, or if the output load capacitance is large. An input bypass capacitor should be selected to provide good high frequency characteristics to insure stable operation under all load conditions. A 0.33μFor larger tantalum, mylar, or other capacitor having low internal impedance at high frequencies should be chosen. The bypass capacitor should be mounted with the shortest possible leads directly across the regulator’s input terminals. Normally good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead. Typical Application Circuit ME78M05 VIN Input Cin 0.33μF Vo Output Co 0.1μF GND Fig.1 Fixed Output Regulator Note:a.Cin is required if the regulator is located an appreciable distance from the power supply filter. b.Although no output capacitor is needed for stability, it does improve transient response. ME78M05 Input VIN Cin 0.33μF Output R GND IQ Io Constant Current to Grounded Load Fig.2 Constant Current Regulator The ME78M05 regulatorcan also be used as a current source when connected as Fig.2. In order to minimize dissipation the ME78M05 is chosen in this application. Resistor R determines the current as follows: IO = V01 5V +IQ R www.microne.com.cn Page 4 of 7 ME78M05 Vo:7V to 20V VIN-Vo≥2.0V ME78M05 VIN Cin 0.33μF Input Output GND R 10K 1K Vo 0.1μF LM741 The addition of an operational amplifier allows adjustment to higher or intermediate values while retaining regulation characteristics. The minimum voltage obtainable with this arrangement is 2.0 V greater than the regulator voltage. V01 www.microne.com.cn Page 5 of 7 ME78M05 Package Information Package Type:TO-252 DIM V01 Millimeters Inches Min Max Min Max A1 0 0.1 0 0.004 A2 2.20 2.40 0.0866 0.0945 A3 0.90 1.10 0.0354 0.0433 b 0.75 0.85 0.0295 0.0335 c 2.20 2.40 0.0866 0.0945 C 0.50 0.60 0.0197 0.0236 D 6.50 6.70 0.2559 0.2638 D1 5.30 5.50 0.2087 0.2165 D2 4.70 4.90 0.1850 0.1929 E 9.90 10.30 0.3898 0.4055 E1 6.00 6.20 0.2362 0.2441 E2 5.20 5.40 0.2047 0.2126 L1 0.90 1.25 0.0354 0.0492 L2 1.70 1.90 0.0669 0.0748 L3 0.60 1.00 0.0236 0.0394 www.microne.com.cn Page 6 of 7 ME78M05      V01 The information described herein is subject to change without notice. Nanjing Micro One Electronics Inc is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Nanjing Micro One Electronics Inc is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Nanjing Micro One Electronics Inc. Although Nanjing Micro One Electronics Inc exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. The user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue. www.microne.com.cn Page 7 of 7