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| 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. Features TO-92 1 P C 2 3 Pin: 1. Output 2. Ground 3. Input * * * * * * * * 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 15k Q1 Q10 3.8k Q4 Q6 5.0k 3.0 0-25k Output Q3 Q5 Q11 Q12 Input Input Cin* 0.33mF MC78LXXA STC78LXX 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. 1.2k Q2 1.9k 19k C 2.2k Q9 Q8 2.85k ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. Z1 420 Q7 1.0k Ground Figure 1. Representative Schematic Diagram 1 STC78L00 Series MAXIMUM RATINGS (TA = +125C, unless otherwise noted.) Rating Input Voltage (2.6 V-8.0 V) Input Voltage (12 V-18 V) Input Voltage Storage Temperature Range Operating Junction Temperature Range Symbol VI Tstg TJ Value 30 35 40 -65 to +150 0 to +150 Unit Vdc C 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, - 40C < TJ < +125C , 0C < TJ < +125C , unless otherwise noted.) STC78L05 Characteristics Output Voltage (TJ = +25C) Line Regulation (TJ = +25C, IO = 40 mA) 7.0 Vdc VI 20 Vdc 8.0 Vdc VI 20 Vdc Load Regulation (TJ = +25C, 1.0 mA IO 100 mA) (TJ = +25C, 1.0 mA IO 40 mA) Output Voltage (7.0 Vdc VI 20 Vdc, 1.0 mA IO 40 mA) (VI = 10 V, 1.0 mA IO 70 mA) Input Bias Current (TJ = +25C) (TJ = +125C) Input Bias Current Change (8.0 Vdc VI 20 Vdc) (1.0 mA IO 40 mA) Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 40 mA, f = 120 Hz, 8.0 Vdc VI 18 V, TJ = +25C) Dropout Voltage (TJ = +25C) Symbol VO Regline - - Regload - - VO 4.75 4.75 IIB - - DIIB - - Vn RR VI - VO - 41 - - - 40 49 1.7 1.5 0.1 - - - mV dB Vdc 3.8 - 6.0 5.5 mA - - 5.25 5.25 mA 11 5.0 60 30 Vdc 55 45 150 100 mV Min 4.8 Typ 5.0 Max 5.2 Unit Vdc mV NOTE: Tlow = -40C, Thigh = +125C. 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, - 40C < TJ < +125C , 0C < TJ < +125C , unless otherwise noted.) STC78L08 Characteristics Output Voltage (TJ = +25C) Line Regulation (TJ = +25C, IO = 40 mA) 10.5 Vdc VI 23 Vdc 11 Vdc VI 23 Vdc Load Regulation (TJ = +25C, 1.0 mA IO 100 mA) (TJ = +25C, 1.0 mA IO 40 mA) Output Voltage (10.5 Vdc VI 23 Vdc, 1.0 mA IO 40 mA) (VI = 14 V, 1.0 mA IO 70 mA) Input Bias Current (TJ = +25C) (TJ = +125C) Input Bias Current Change (11 Vdc VI 23 Vdc) (1.0 mA IO 40 mA) Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 40 mA, f = 120 Hz, 12 V VI 23 V, TJ = +25C) Dropout Voltage (TJ = +25C) Symbol VO Regline - - Regload - - VO 7.6 7.6 IIB - - DIIB - - Vn RR VI - VO - 37 - - - 60 57 1.7 1.5 0.1 - - - mV dB Vdc 3.0 - 6.0 5.5 mA - - 8.4 8.4 mA 15 8.0 80 40 Vdc 20 12 175 125 mV Min 7.7 Typ 8.0 Max 8.3 Unit Vdc mV ELECTRICAL CHARACTERISTICS (VI = 15 V, IO = 40 mA, CI = 0.33 mF, CO = 0.1 mF, - 40C < TJ < +125C , 0C < TJ < +125C , unless otherwise noted.) STC78L09 Characteristics Output Voltage (TJ = +25C) Line Regulation (TJ = +25C, IO = 40 mA) 11.5 Vdc VI 24 Vdc 12 Vdc VI 24 Vdc Load Regulation (TJ = +25C, 1.0 mA IO 100 mA) (TJ = +25C, 1.0 mA IO 40 mA) Output Voltage (11.5 Vdc VI 24 Vdc, 1.0 mA IO 40 mA) (VI = 15 V, 1.0 mA IO 70 mA) Input Bias Current (TJ = +25C) (TJ = +125C) Input Bias Current Change (11 Vdc VI 23 Vdc) (1.0 mA IO 40 mA) Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 40 mA, f = 120 Hz, 13 V VI 24 V, TJ = +25C) Dropout Voltage (TJ = +25C) Symbol VO Regline - - Regload - - VO 8.5 8.5 IIB - - DIIB - - Vn RR VI - VO - 37 - - - 60 57 1.7 1.5 0.1 - - - mV dB Vdc 3.0 - 6.0 5.5 mA - - 9.5 9.5 mA 15 8.0 90 40 Vdc 20 12 175 125 mV Min 8.6 Typ 9.0 Max 9.4 Unit Vdc mV 3 STC78L00 Series ELECTRICAL CHARACTERISTICS (VI = 19 V, IO = 40 mA, CI = 0.33 mF, CO = 0.1 mF, - 40C < TJ < +125C , 0C < TJ < +125C , unless otherwise noted.) STC78L12 Characteristics Output Voltage (TJ = +25C) Line Regulation (TJ = +25C, IO = 40 mA) 14.5 Vdc VI 27 Vdc 16 Vdc VI 27 Vdc Load Regulation (TJ = +25C, 1.0 mA IO 100 mA) (TJ = +25C, 1.0 mA IO 40 mA) Output Voltage (14.5 Vdc VI 27 Vdc, 1.0 mA IO 40 mA) (VI = 19 V, 1.0 mA IO 70 mA) Input Bias Current (TJ = +25C) (TJ = +125C) Input Bias Current Change (16 Vdc VI 27 Vdc) (1.0 mA IO 40 mA) Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 40 mA, f = 120 Hz, 15 V VI 25 V, TJ = +25C) Dropout Voltage (TJ = +25C) Symbol VO Regline - - Regload - - VO 11.4 11.4 IIB - - DIIB - - Vn RR VI - VO - 37 - - - 80 42 1.7 1.5 0.1 - - - mV dB Vdc 4.2 - 6.5 6.0 mA - - 12.6 12.6 mA 20 10 100 50 Vdc 120 100 250 200 mV Min 11.5 Typ 12 Max 12.5 Unit Vdc mV ELECTRICAL CHARACTERISTICS (VI = 23 V, IO = 40 mA, CI = 0.33 mF, CO = 0.1 mF, - 40C < TJ < +125C , S 0C < TJ < +125C , unless otherwise noted.) STC78L15 Characteristics Output Voltage (TJ = +25C) Line Regulation (TJ = +25C, IO = 40 mA) 17.5 Vdc VI 30 Vdc 20 Vdc VI 30 Vdc Load Regulation (TJ = +25C, 1.0 mA IO 100 mA) (TJ = +25C, 1.0 mA IO 40 mA) Output Voltage (17.5 Vdc VI 30 Vdc, 1.0 mA IO 40 mA) (VI = 23 V, 1.0 mA IO 70 mA) Input Bias Current (TJ = +25C) (TJ = +125C) Input Bias Current Change (20 Vdc VI 30 Vdc) (1.0 mA IO 40 mA) Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 40 mA, f = 120 Hz, 18.5 V VI 28.5 V, TJ = +25C) Dropout Voltage (TJ = +25C) Symbol VO Regline - - Regload - - VO 14.25 14.25 IIB - - DIIB - - Vn RR VI - VO - 34 - - - 90 39 1.7 1.5 0.1 - - - mV dB Vdc 4.4 - 6.5 6.0 mA - - 15.75 15.75 mA 25 12 150 75 Vdc 130 110 300 250 mV Min 14.4 Typ 15 Max 15.6 Unit Vdc mV 4 STC78L00 Series ELECTRICAL CHARACTERISTICS (VI = 27 V, IO = 40 mA, CI = 0.33 mF, CO = 0.1 mF, 0C < TJ < +125C, unless otherwise noted.) STC78L18 Characteristics Output Voltage (TJ = +25C) Line Regulation (TJ = +25C, 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 Load Regulation (TJ = +25C, 1.0 mA IO 100 mA) (TJ = +25C, 1.0 mA IO 40 mA) 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) Input Bias Current (TJ = +25C) (TJ = +125C) Input Bias Current Change (22 Vdc VI 33 Vdc) (21 Vdc VI 33 Vdc) (1.0 mA IO 40 mA) Output Noise Voltage (TA = +25C, 10 Hz f 100 kHz) Ripple Rejection (IO = 40 mA, f = 120 Hz, 23 V VI 33 V, TJ = +25C) Dropout Voltage (TJ = +25C) Symbol VO Min 17.3 Typ 18 Max 18.7 Unit Vdc Regline - - 45 35 30 15 325 275 mV Regload - - VO 17.1 17.1 IIB - - DIIB - - Vn RR VI - VO - 33 - - - 150 48 1.7 1.5 0.1 - - - 3.1 - 6.5 6.0 - - 18.9 18.9 170 85 mV Vdc mA mA mV dB Vdc 5 STC78L00 Series 8.0 VO, OUTPUT VOLTAGE (V) MC78L05AC STC78L05 Vout = 5.0 V TJ = 25C IO = 1.0 mA 4.0 IO = 40 mA 2.0 IO = 100 mA V I -V O , INPUT/OUTPUT DIFFERENTIAL VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 0 0 25 50 75 100 TJ, JUNCTION TEMPERATURE (C) 125 IO = 40 mA IO = 1.0 mA Dropout of Regulation is defined as when VO = 2% of VO IO = 70 mA 6.0 0 0 2.0 4.0 6.0 VI, INPUT VOLTAGE (V) 8.0 10 Figure 3. Dropout Characteristics Figure 4. Dropout Voltage versus Junction Temperature 4.2 I IB , INPUT BIAS CURRENT (mA) 4.0 3.8 3.6 3.4 3.2 3.0 0 0 25 50 75 100 TA, AMBIENT TEMPERATURE (C) 125 STC78L05 MC78L05AC VI = 10 V VO= 5.0 V IO = 40 mA 5.0 I IB , INPUT BIAS CURRENT (mA) 4.0 3.0 2.0 1.0 0 0 5.0 10 15 20 25 VI, INPUT VOLTAGE (V) 30 35 40 MC78L05AC STC78L05 Vout = 5.0 V IO = 40 mA TJ = 25C Figure 5. Input Bias Current versus Ambient Temperature Figure 6. Input Bias Current versus Input Voltage 10,000 PD , POWER DISSIPATION (mW) No Heatsink 1000 100 RqJA = 200C/W PD(max) to 25C = 625 mW 10 25 50 75 100 125 TA, AMBIENT TEMPERATURE (C) 150 Figure 7. Maximum Average Power Dissipation versus Ambient Temperature - TO-92 Type Package 7 STC78L00 Series APPLICATIONS INFORMATION Design Considerations 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 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. +20V 0.33mF Input 0.33mF IO MC78L05A STC78L05 R Constant Current to Grounded Load MC78L15A STC78L15 2 - MC1741 3 + 4 MPS A70 7 +VO 10k 6 10k 0.33mF 6.5 20V MPS U55 The STC78L00 regulators can also be used as a current source MC78L00 when connected as above. In order to minimize dissipation the MC78L05C STC78L05 is chosen in this application. Resistor R determines the current as follows: 5.0 V + IB IO = R IIB = 3.8 mA over line and load changes For example, a 100 mA current source would require R to be a 50 W, 1/2 W resistor and the output voltage compliance would be the input voltage less 7 V. -VO Figure 9. 15 V Tracking Voltage Regulator +VI 0.33mF -VI 0.33mF MC79LXXA STC79LXX 0.1mF -VO MC78LXXA STC78LXX 0.1mF +VO Figure 8. Current Regulator Figure 10. Positive and Negative Regulator 8 |
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