78L05

78LXX Features  Output Current of 100mA  Output transistor safe area protection  Thermal Overload Protection  No external components  Short Circuit Protection  Package：SOT89-3 and TO92  Output voltage accuracy: tolerance ±5% General Description 78LXX is three-terminal positive regulators. One of these regulators can deliver up to 100mA of output current. The internal limiting and thermal-shutdown features of the regulator make them essentially immune to overload. When used as are placement for a zener diode-resistor Combination, an effective improvement in output impedance can be obtained, together with lower quiescent current. SI PR O IN Pin Configuration Ver1.5 1 Shanghai Siproin Microelectronics Co. 78LXX Selection Table Part No. Output Voltage 78L05 5.0V 78L06 6.0V 78L08 8.0V 78L09 9.0V 78L12 12.0V Package TO92 SOT89 PR O IN Block Diagram SI Absolute Maximum Ratings（Ta=25℃） Parameter Rating Unit Input supply voltage: VIN 30 V MAX. Output current:Iout 100 mA MAX Power:Pmax 0.5 W Maximum junction temperature:Tj -25~125 ℃ Storage -55~125 ℃ +260(Recommended 10S) ℃ temperature:Tstr Soldering temperature and time Note: 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. Ver1.5 2 Shanghai Siproin Microelectronics Co. 78LXX Electrical Characteristics (Cin=0.33uF, Co=0.1uF, 0≤Tj≤125℃，unless otherwise noted) Parameter Symbol Conditions Min. Typ. Max. Io=40mA, VIN=10V 0.964vout vout 1.036vout 0.96vout vout 1.04vout Unit Io=1mA~40mA Output Voltage Vout VIN=7V~18V V Io=1mA~10mA 0.95vout VIN=10V LNR LDR Dropout Voltage V DIF Output noise Voltage VN 1.05vout -150 - 150 VIN=8V~18V, Io=40mA -100 - 100 VIN=10V, Io=1mA~100mA -100 - 100 VIN=10V, -30 - 30 - 2 - - 40 - uV/Vo - 80 - dB - - 5.5 mA -1.5 - 1.5 -0.1 - 0.1 Io=1mA~40mA Tj=25℃，Io=100mA PR O Load Regulation Io=40mA IN VIN=7V~18V, Line Regulation vout F=10Hz to 100KHz mV mV V Tj=25℃，f=120Hz, Ripple Rejection Quiescent Current PSRR IQ Io=40mA, VIN=8V~20V VIN=10V, IOUT=40mA VIN=8V~18V, IO=40mA SI Quiescent Current △IQ mA VIN=10V, IOUT=1mA~40mA, 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. Ver1.5 3 Shanghai Siproin Microelectronics Co. 78LXX SI PR O IN Typical Performance Characteristics Ver1.5 4 Shanghai Siproin Microelectronics Co. 78LXX Operation Description 78LXX 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 IN 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 PR O 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. SI Typical Application A common ground is required between the input and the output voltages. The input voltage must remain typically 2.0 V above the output voltage even during the low point on the input ripple voltage. ●Cin is required if regulator is located an appreciable distance from power supply filter. ●Co is not needed for stability; however, it does improve transient response. Ver1.5 5 Shanghai Siproin Microelectronics Co. 78LXX The 78LXX regulator can also be used as a current source when connected as Fig.2. In order to minimize IN dissipation the H78LXXis chosen in this application. Resistor R determines the current as SI PR O follows: Ver1.5 6 Shanghai Siproin Microelectronics Co. 78LXX Package Information SI PR O IN 3-pin SOT89 Outline Dimensions Ver1.5 7 Shanghai Siproin Microelectronics Co. 78LXX SI PR O IN 3-pin TO92 Outline Dimensions Ver1.5 8 Shanghai Siproin Microelectronics Co.