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| STC79L00 Series 100 mA Negative Voltage Regulators The STC79L00, A Series negative voltage regulators are inexpensive, easy-to-use devices suitable for numerous applications requiring up to 100 mA. Like the higher powered STC7900 Series negative regulators, this series features thermal shutdown and current limiting, making them remarkably rugged. In most applications, no external components are required for operation. The STC79L00 devices are useful for on-card regulation or any other application where a regulated negative voltage at a modest current level is needed. These regulators offer substantial advantage over the common resistor/Zener diode approach. Features 8 1 TO-92 P C SOIC-8 D SUFFIX 1 2 3 CASE 751 Pin: 1. Output 2. Ground 3. Input * * * * * * * Pb-Free Packages are Available No External Components Required Internal Short Circuit Current Limiting Internal Thermal Overload Protection Low Cost Complementary Positive Regulators Offered (STC78L00 Series) Available in Either 5% (AC) or 10% (C) Selections THREE-TERMINAL LOW CURRENT NEGATIVE FIXED VOLTAGE REGULATORS GND R 5 R18 R6 R8 Q10 Q5 Q4 R7 Q8 Q1 R2 Z1 R3 C Q6 R10 R11 Q7 Q2 Q11 R14 R15 Input Q14 Q9 R4 Q12 Q13 R16 R9 R17 R1 ORDERING INFORMATION See detailed ordering and shipping information in the package Outpu dimensions section on page 9 of this data sheet. Figure 1. Representative Schematic Diagram * Automotive temperature range selections are available with special test conditions and additional tests in 5, 12 and 15 V devices. Contact your local ON Semiconductor sales office for information. 1 STC79L00 Series MAXIMUM RATINGS (TA = +125C, unless otherwise noted.) Rating Input Voltage (-5 V) Input Voltage (-12,-15,-18 V) Input Voltage Storage Temperature Range Operating Junction Temperature Range Symbol VI Tstg TJ Value -35 40 -65 to +150 0 to +150 -30 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 qF, CO = 0.1 qF, -40C < TJ < +125C , 0C < TJ < +125C , unless otherwise noted.) STC79L05 Characteristics Output Voltage (TJ = +25C) Line Regulation (TJ = +25C, IO = 40 mA) -20 Vdc VI -7 Vdc -20 Vdc VI -8 Vdc Load Regulation (TJ = +25C, 1.0 mA IO 100 mA) (TJ = +25C, 1.0 mA IO 40 mA) Output Voltage (-20 Vdc VI -7.0 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 (-20.0 Vdc VI -8 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 Vdc VI -8.0 V, TJ = +25C) Dropout Voltage (TJ = +25C) Symbol VO Regline - - Regload - - VO -4.75 -4.75 - - DIIB - - Vn RR VI - VO - 41 - - - 40 49 1.7 1.5 0.1 - - - qV dB Vdc 11 5.0 - - 3.8 - 60 30 Vdc -5.25 -5.25 mA 6.0 5.5 mA 55 45 150 100 mV Min -4.8 Typ -5.0 Max -5.2 Unit Vdc mV IIB NOTE: Tlow = -40C, Thigh = +125C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and change control. 2 STC79L00 Series ELECTRICAL CHARACTERISTICS (VI = -19 V, IO = 40 mA, CI = 0.33 qF, CO = 0.1 qF, -40C < TJ < +125C , 0C < TJ < +125C , unless otherwise noted.) STC79L12 Characteristics Output Voltage (TJ = +25C) Line Regulation (TJ = +25C, IO = 40 mA) -27Vdc VI -14.5 Vdc -27 Vdc VI -16 Vdc Load Regulation (TJ = +25C, 1.0 mA IO 100 mA) (TJ = +25C, 1.0 mA IO 40 mA) Output Voltage (-27 Vdc VI -14.5 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 (-27 Vdc VI -16 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, -25 V VI -15 V, TJ = +25C) Dropout Voltage (TJ = +25C) Symbol VO Regline - - Regload - - VO -11.4 Min -11.5 Typ -12 Max -12.5 Unit Vdc mV 120 100 20 10 - - 4.2 - - - 80 42 1.7 250 200 mV 100 50 Vdc -12.6 -12.6 mA 6.5 6.0 mA 1.5 0.1 - - - qV dB Vdc -11.4 IIB - - DIIB - - Vn RR VI - VO - 37 - ELECTRICAL CHARACTERISTICS (VI = - 23 V, IO = 40 mA, CI = 0.33 q CO = 0.1 qF, -40C < TJ < +125C , F, S 0C < TJ < +125C , unless otherwise noted.) STC79L15 Characteristics Output Voltage (TJ = +25C) Line Regulation (TJ = +25C, IO = 40 mA) -30 Vdc VI -17.5Vdc -30 Vdc VI -20 Vdc Load Regulation (TJ = +25C, 1.0 mA IO 100 mA) (TJ = +25C, 1.0 mA IO 40 mA) Output Voltage (-30 Vdc VI -17.5 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 (-30 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, -28.5 V VI -18.5 V, TJ = +25C) Dropout Voltage (TJ = +25C) Symbol VO Regline - - Regload - - VO -14.25 Min -14.4 Typ -15 Max -15.6 Unit Vdc mV 130 110 25 12 - - 4.4 - - - 90 39 1.7 300 250 mV 150 75 Vdc -15.75 -15.75 mA 6.5 6.0 mA 1.5 0.1 - - - qV dB Vdc -14.25 IIB - - DIIB - - Vn RR VI - VO - 34 - 3 STC79L00 Series ELECTRICAL CHARACTERISTICS (VI = -27 V, IO = 40 mA, CI = 0.33 qF, CO = 0.1 qF, 0C < TJ < +125C, unless otherwise noted.) STC79L18 Characteristics Output Voltage (TJ = +25C) Line Regulation (TJ = +25C, IO = 40 mA) -33Vdc VI -21.4 Vdc -33 Vdc VI -20.7 Vdc -33Vdc VI -22 Vdc -33Vdc VI -21 Vdc Load Regulation (TJ = +25C, 1.0 mA IO 100 mA) (TJ = +25C, 1.0 mA IO 40 mA) Output Voltage (-33 Vdc VI -21.4 Vdc, 1.0 mA IO 40 mA) (-33 Vdc VI -20.7 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 (-33 Vdc VI -27 Vdc) (-33 Vdc VI -21 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, -33 V VI -23 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 mV 170 85 Vdc - - 3.1 - -18.9 -18.9 mA - - 6.5 6.0 mA - - - - 150 48 1.7 1.5 0.1 - - - qV dB Vdc -17.1 IIB DIIB Vn RR VI - VO - 33 - 4 STC79L00 Series APPLICATIONS INFORMATION Design Considerations The STC79L00, A Series of fixed voltage regulators are designed with Thermal Overload Protections 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. 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 length, 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 0.33 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 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. Bypassing the output is also recommended. Input +Vin 0.33mF STC78LXX MC78LXX STC79LXX MC79LXX Output CO** 0.1mF +VO 0.1mF CI* 0.33mF 0.1mF -Vin 0.33mF STC79LXX MC79LXX -VO 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 ripple voltage. * CI is required if regulator is located an appreciable * distance from the power supply filter ** CO improves stability and transient response. Figure 2. Positive and Negative Regulator Figure 3. Standard Application 6 STC79L00 Series TYPICAL CHARACTERISTICS (TA = +25C, unless otherwise noted.) V I -V O , INPUT/OUTPUT DIFFERENTIAL VOLTAGE (V) 8.0 VO, OUTPUT VOLTAGE (V) MC79L05C STC79L05 VO = -5.0 V TJ = 25C IO = 1.0 mA IO = 100 mA -2.5 -2.0 -1.5 IO = 1.0 mA -1.0 -0.5 0 Dropout of Regulation is defined when DVO = 2% of VO 6.0 IO = 70 mA IO = 40 mA 4.0 2.0 IO = 40 mA 0 0 -2.0 -4.0 -6.0 Vin, INPUT VOLTAGE (V) -0.8 -10 0 25 50 75 100 TJ, JUNCTION TEMPERATURE (C) 125 Figure 4. Dropout Characteristics Figure 5. 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 MC79L05C STC79L05 Vin = -10 V VO = -5.0 V IO = 40 mA 25 50 75 100 TA, AMBIENT TEMPERATURE (C) 125 I IB , INPUT BIAS CURRENT (mA) 5.0 4.0 3.0 2.0 1.0 0 MC79L05C STC79L05 VO = -5.0 V IO = 40 mA 0 -5.0 -10 -15 -20 -25 -30 Vin, INPUT VOLTAGE (V) -35 -40 Figure 6. Input Bias Current versus Ambient Temperature Figure 7. Input Bias Current versus Input Voltage 10,000 P D , POWER DISSIPATION (mW) 1,000 No Heatsink 100 RqJA = 200C/W PD(max) to 25C = 625 mW 10 25 50 75 100 125 TA, AMBIENT TEMPERATURE (C) 150 Figure 8. Maximum Average Power Dissipation versus Ambient Temperature (TO-92) 7 |
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