STC78L00 Series ! 100 mA Positive Voltage Regulators The STC78L00 Series of positive voltage regulators are inexpensive, easy−to−use devices suitable for a multitude of applications that require a regulated supply of up to 100 mA. Like their higher powered STC7800 and STC78M00 Series cousins, these regulators feature internal current limiting and thermal shutdown making them remarkably rugged. No external components are required with the STC78L00 devices in many applications. These devices offer a substantial performance advantage over the traditional zener diode−resistor combination, as output impedance and quiescent current are substantially reduced. TO−92 1 P C 2 3 Pin: 1. Output 2. Ground 3. Input Features • • • • • • • • Wide Range of Available, Fixed Output Voltages Low Cost Internal Short Circuit Current Limiting Internal Thermal Overload Protection No External Components Required Complementary Negative Regulators Offered (STC79L00 Series) Pb−Free Packages are Available NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes Q3 15k Input Q11 Q5 Q12 Q1 Q10 5.0k 3.8k Q4 1.9k 1.2k Q6 Output Cin* 0.33mF Output CO** Figure 2. Standard 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. 0−25k 19k 2.2k Q8 Q2 ORDERING INFORMATION Q9 C Z1 3.0 MC78LXXA STC78LXX Input See detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. 2.85k Q7 420 1.0k Ground Figure 1. Representative Schematic Diagram 1 STC78L00 Series MAXIMUM RATINGS (TA = +125°C, unless otherwise noted.) Rating Symbol Value Unit VI Vdc °C Input Voltage (2.6 V−8.0 V) Input Voltage (12 V−18 V) Input Voltage Storage Temperature Range Tstg 30 35 40 −65 to +150 Operating Junction Temperature Range TJ 0 to +150 °C Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. ELECTRICAL CHARACTERISTICS (VI = 10 V, IO = 40 mA, CI = 0.33 mF, CO = 0.1 mF, − 40°C < TJ < +125°C , 0°C < TJ < +125°C , unless otherwise noted.) STC78L05 Characteristics Symbol Min Typ Max Unit Output Voltage (TJ = +25°C) VO 4.8 5.0 5.2 Vdc Line Regulation (TJ = +25°C, IO = 40 mA) 7.0 Vdc ≤ VI ≤ 20 Vdc 8.0 Vdc ≤ VI ≤ 20 Vdc Regline Load Regulation (TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA) (TJ = +25°C, 1.0 mA ≤ IO ≤ 40 mA) Regload Output Voltage (7.0 Vdc ≤ VI ≤ 20 Vdc, 1.0 mA ≤ IO ≤ 40 mA) (VI = 10 V, 1.0 mA ≤ IO ≤ 70 mA) VO Input Bias Current (TJ = +25°C) (TJ = +125°C) IIB mV − − 55 45 150 100 − − 11 5.0 60 30 4.75 4.75 − − 5.25 5.25 − − 3.8 − 6.0 5.5 − − − − 1.5 0.1 mV Vdc mA DIIB Input Bias Current Change (8.0 Vdc ≤ VI ≤ 20 Vdc) (1.0 mA ≤ IO ≤ 40 mA) mA Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) Vn − 40 − mV Ripple Rejection (IO = 40 mA, f = 120 Hz, 8.0 Vdc ≤ VI ≤ 18 V, TJ = +25°C) RR 41 49 − dB VI − VO − 1.7 − Vdc Dropout Voltage (TJ = +25°C) NOTE: Tlow = −40°C, Thigh = +125°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and change control. 2 STC78L00 Series ELECTRICAL CHARACTERISTICS (VI = 14 V, IO = 40 mA, CI = 0.33 mF, CO = 0.1 mF, − 40°C < TJ < +125°C , 0°C < TJ < +125°C , unless otherwise noted.) STC78L08 Symbol Min Typ Max Unit Output Voltage (TJ = +25°C) Characteristics VO 7.7 8.0 8.3 Vdc Line Regulation (TJ = +25°C, IO = 40 mA) 10.5 Vdc ≤ VI ≤ 23 Vdc 11 Vdc ≤ VI ≤ 23 Vdc Regline Load Regulation (TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA) (TJ = +25°C, 1.0 mA ≤ IO ≤ 40 mA) Regload Output Voltage (10.5 Vdc ≤ VI ≤ 23 Vdc, 1.0 mA ≤ IO ≤ 40 mA) (VI = 14 V, 1.0 mA ≤ IO ≤ 70 mA) VO Input Bias Current (TJ = +25°C) (TJ = +125°C) IIB mV − − 20 12 175 125 − − 15 8.0 80 40 7.6 7.6 − − 8.4 8.4 − − 3.0 − 6.0 5.5 − − − − 1.5 0.1 mV Vdc mA DIIB Input Bias Current Change (11 Vdc ≤ VI ≤ 23 Vdc) (1.0 mA ≤ IO ≤ 40 mA) mA Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) Vn − 60 − mV Ripple Rejection (IO = 40 mA, f = 120 Hz, 12 V ≤ VI ≤ 23 V, TJ = +25°C) RR 37 57 − dB VI − VO − 1.7 − Vdc Dropout Voltage (TJ = +25°C) ELECTRICAL CHARACTERISTICS (VI = 15 V, IO = 40 mA, CI = 0.33 mF, CO = 0.1 mF, − 40°C < TJ < +125°C , 0°C < TJ < +125°C , unless otherwise noted.) STC78L09 Characteristics Symbol Min Typ Max Unit Output Voltage (TJ = +25°C) VO 8.6 9.0 9.4 Vdc Line Regulation (TJ = +25°C, IO = 40 mA) 11.5 Vdc ≤ VI ≤ 24 Vdc 12 Vdc ≤ VI ≤ 24 Vdc Regline Load Regulation (TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA) (TJ = +25°C, 1.0 mA ≤ IO ≤ 40 mA) Regload Output Voltage (11.5 Vdc ≤ VI ≤ 24 Vdc, 1.0 mA ≤ IO ≤ 40 mA) (VI = 15 V, 1.0 mA ≤ IO ≤ 70 mA) VO Input Bias Current (TJ = +25°C) (TJ = +125°C) IIB mV − − 20 12 175 125 − − 15 8.0 90 40 8.5 8.5 − − 9.5 9.5 − − 3.0 − 6.0 5.5 − − − − 1.5 0.1 mV Vdc mA DIIB Input Bias Current Change (11 Vdc ≤ VI ≤ 23 Vdc) (1.0 mA ≤ IO ≤ 40 mA) mA Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) Vn − 60 − mV Ripple Rejection (IO = 40 mA, f = 120 Hz, 13 V ≤ VI ≤ 24 V, TJ = +25°C) RR 37 57 − dB VI − VO − 1.7 − Vdc Dropout Voltage (TJ = +25°C) 3 STC78L00 Series ELECTRICAL CHARACTERISTICS (VI = 19 V, IO = 40 mA, CI = 0.33 mF, CO = 0.1 mF, − 40°C < TJ < +125°C , 0°C < TJ < +125°C , unless otherwise noted.) STC78L12 Characteristics Symbol Min Typ Max Unit Output Voltage (TJ = +25°C) VO 11.5 12 12.5 Vdc Line Regulation (TJ = +25°C, IO = 40 mA) 14.5 Vdc ≤ VI ≤ 27 Vdc 16 Vdc ≤ VI ≤ 27 Vdc Regline Load Regulation (TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA) (TJ = +25°C, 1.0 mA ≤ IO ≤ 40 mA) Regload Output Voltage (14.5 Vdc ≤ VI ≤ 27 Vdc, 1.0 mA ≤ IO ≤ 40 mA) (VI = 19 V, 1.0 mA ≤ IO ≤ 70 mA) VO Input Bias Current (TJ = +25°C) (TJ = +125°C) IIB mV − − 120 100 250 200 − − 20 10 100 50 11.4 11.4 − − 12.6 12.6 − − 4.2 − 6.5 6.0 − − − − 1.5 0.1 mV Vdc mA DIIB Input Bias Current Change (16 Vdc ≤ VI ≤ 27 Vdc) (1.0 mA ≤ IO ≤ 40 mA) mA Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) Vn − 80 − mV Ripple Rejection (IO = 40 mA, f = 120 Hz, 15 V ≤ VI ≤ 25 V, TJ = +25°C) RR 37 42 − dB VI − VO − 1.7 − Vdc Dropout Voltage (TJ = +25°C) ELECTRICAL CHARACTERISTICS (VI = 23 V, IO = 40 mA, CI = 0.33 mF, CO = 0.1 mF, − 40°C < TJ < +125°C , S 0°C < TJ < +125°C , unless otherwise noted.) STC78L15 Characteristics Symbol Min Typ Max Unit Output Voltage (TJ = +25°C) VO 14.4 15 15.6 Vdc Line Regulation (TJ = +25°C, IO = 40 mA) 17.5 Vdc ≤ VI ≤ 30 Vdc 20 Vdc ≤ VI ≤ 30 Vdc Regline Load Regulation (TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA) (TJ = +25°C, 1.0 mA ≤ IO ≤ 40 mA) Regload Output Voltage (17.5 Vdc ≤ VI ≤ 30 Vdc, 1.0 mA ≤ IO ≤ 40 mA) (VI = 23 V, 1.0 mA ≤ IO ≤ 70 mA) VO Input Bias Current (TJ = +25°C) (TJ = +125°C) IIB mV − − 130 110 300 250 − − 25 12 150 75 14.25 14.25 − − 15.75 15.75 − − 4.4 − 6.5 6.0 − − − − 1.5 0.1 mV Vdc mA DIIB Input Bias Current Change (20 Vdc ≤ VI ≤ 30 Vdc) (1.0 mA ≤ IO ≤ 40 mA) mA Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) Vn − 90 − mV Ripple Rejection (IO = 40 mA, f = 120 Hz, 18.5 V ≤ VI ≤ 28.5 V, TJ = +25°C) RR 34 39 − dB VI − VO − 1.7 − Vdc Dropout Voltage (TJ = +25°C) 4 STC78L00 Series ELECTRICAL CHARACTERISTICS (VI = 27 V, IO = 40 mA, CI = 0.33 mF, CO = 0.1 mF, 0°C < TJ < +125°C, unless otherwise noted.) STC78L18 Characteristics Symbol Min Typ Max Unit Output Voltage (TJ = +25°C) VO 17.3 18 18.7 Vdc Line Regulation (TJ = +25°C, IO = 40 mA) 21.4 Vdc ≤ VI ≤ 33 Vdc 20.7 Vdc ≤ VI ≤ 33 Vdc 22 Vdc ≤ VI ≤ 33 Vdc 21 Vdc ≤ VI ≤ 33 Vdc Regline − 45 325 − 35 275 − − 30 15 170 85 Load Regulation (TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA) (TJ = +25°C, 1.0 mA ≤ IO ≤ 40 mA) Regload Output Voltage (21.4 Vdc ≤ VI ≤ 33 Vdc, 1.0 mA ≤ IO ≤ 40 mA) (20.7 Vdc ≤ VI ≤ 33 Vdc, 1.0 mA ≤ IO ≤ 40 mA) (VI = 27 V, 1.0 mA ≤ IO ≤ 70 mA) (VI = 27 V, 1.0 mA ≤ IO ≤ 70 mA) VO Input Bias Current (TJ = +25°C) (TJ = +125°C) IIB mV Vdc 17.1 − 18.9 17.1 − 18.9 − − 3.1 − 6.5 6.0 mA DIIB Input Bias Current Change (22 Vdc ≤ VI ≤ 33 Vdc) (21 Vdc ≤ VI ≤ 33 Vdc) (1.0 mA ≤ IO ≤ 40 mA) mV mA − − − − 1.5 0.1 Output Noise Voltage (TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) Vn − 150 − mV Ripple Rejection (IO = 40 mA, f = 120 Hz, 23 V ≤ VI ≤ 33 V, TJ = +25°C) RR 33 48 − dB VI − VO − 1.7 − Vdc Dropout Voltage (TJ = +25°C) 5 V I −V O , INPUT/OUTPUT DIFFERENTIAL VOLTAGE (V) STC78L00 Series VO, OUTPUT VOLTAGE (V) 8.0 MC78L05AC STC78L05 Vout = 5.0 V TJ = 25°C 6.0 IO = 1.0 mA 4.0 IO = 40 mA IO = 100 mA 2.0 0 0 2.0 4.0 6.0 VI, INPUT VOLTAGE (V) 8.0 10 Figure 3. Dropout Characteristics I IB , INPUT BIAS CURRENT (mA) I IB , INPUT BIAS CURRENT (mA) IO = 70 mA 2.0 1.5 IO = 40 mA 1.0 IO = 1.0 mA Dropout of Regulation is defined as when VO = 2% of VO 0.5 0 0 25 50 75 100 TJ, JUNCTION TEMPERATURE (°C) 125 Figure 4. Dropout Voltage versus Junction Temperature 5.0 4.2 4.0 3.8 3.6 3.4 STC78L05 MC78L05AC VI = 10 V VO= 5.0 V IO = 40 mA 3.2 3.0 4.0 MC78L05AC STC78L05 Vout = 5.0 V IO = 40 mA TJ = 25°C 3.0 2.0 1.0 0 0 0 25 50 75 100 TA, AMBIENT TEMPERATURE (°C) 125 0 Figure 5. Input Bias Current versus Ambient Temperature No Heatsink 1000 100 RqJA = 200°C/W PD(max) to 25°C = 625 mW 10 25 50 75 100 125 TA, AMBIENT TEMPERATURE (°C) 5.0 10 15 20 25 VI, INPUT VOLTAGE (V) 30 Figure 6. Input Bias Current versus Input Voltage 10,000 PD , POWER DISSIPATION (mW) 2.5 150 Figure 7. Maximum Average Power Dissipation versus Ambient Temperature − TO−92 Type Package 7 35 40 STC78L00 Series APPLICATIONS INFORMATION Design Considerations input bypass capacitor should be selected to provide good high−frequency characteristics to insure stable operation under all load conditions. A 0.33 mF or 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 regulators input terminals. Good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead. Bypassing the output is also recommended. The STC78L00 Series of fixed voltage regulators are designed with Thermal Overload Protection that shuts down the circuit when subjected to an excessive power overload condition. Internal Short Circuit Protection limits the maximum current the circuit will pass. 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. The MC78L15A STC78L15 +20V 0.33mF Input 7 MC78L05A STC78L05 R 0.33mF IO 6 Constant Current to Grounded Load +VO 2 − MC1741 3 + 4 0.33mF 6.5 20V The STC78L00 MC78L00 regulators can also be used as a current source when connected as above. In order to minimize dissipation the MC78L05C is chosen in this application. Resistor R determines STC78L05 the current as follows: 5.0 V + IB IO = R 10k 10k MPS A70 −VO MPS U55 Figure 9. ± 15 V Tracking Voltage Regulator +VI MC78LXXA STC78LXX 0.33mF IIB = 3.8 mA over line and load changes −VI For example, a 100 mA current source would require R to be a 50W, 1/2 W resistor and the output voltage compliance would be the input voltage less 7 V. 0.33mF +VO 0.1mF MC79LXXA STC79LXX 0.1mF −VO Figure 8. Current Regulator Figure 10. Positive and Negative Regulator 8