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MC79LXXA/LM79LXXA
3-Terminal 0.1A Negative Voltage Regulator
Features
* * * * * * Output Current up to 100mA No External Components Internal Thermal Over Load Protection Internal Short Circuit Current Limiting Output Voltage Offered in 5% Tolerance Output Voltage of -5V, -8V, -12V, -15V, -18V, -24V
Description
These regulators employ internal current limiting and thermal shutdown, making them essentially indestructible.
TO-92 SOT-89
1 1
1.GND 2.Input 3.Output 8-SOP
1
1. Output 2.3.6.7. Input 5. GND 4.8. NC
Internal Block Diagram
GND R26 Q10 Q12 Q11 D3 D2 R22 R23+R21 Q6 R18 Q4 Q15 Q16 Q14 R28 R24 Q13 R25 R29 Q17 Q9 R7 C1 R16 R17 Q8 Q1 R1 R2 D1 R6 R3 R4 R5 Input Q7 R Q2Q3 Output Q5 R15
R27
Rev. 1.0.2
(c)2002 Fairchild Semiconductor Corporation
MC79LXXA/LM79LXXA
Absolute Maximum Ratings
Parameter Input Voltage (for Vo = -5V to -8V) (for VO = -12V to -18V) (for VO = -24V) Operating Temperature Range Storage Temperature Range Symbol VI TOPR TSTG Value -30 -35 -40 0 ~ +125 -65 ~ +150 Unit V C C
Electrical Characteristics(MC79L05A/LM79L05A)
(VI = -10V, IO = 40mA, CI = 0.33F, CO = 0.1F, 0C TJ +125C, unless otherwise specified) Parameter Output Voltage Line Regulation (Note1) Symbol VO VO VO VO IQ With Line With Load IQ IQ VN RR VD TJ = +25C -7.0V VI -20V TJ =+25C -8V VI -20V 1.0mA IO 100mA 1.0mA IO 40mA Conditions Min. -4.8 -4.75 -4.75 41 Typ. -5.0 15 20 10 2.0 30 60 1.7 Max. -5.2 150 100 60 30 -5.25 -5.25 5.5 6.0 1.5 0.1 Unit V mV mV mV mV V V mA mA mA V dB V
Load Regulation (Note1) Output Voltage Quiescent Current Quiescent Current Change Output Noise Voltage Ripple Rejection Dropout Voltage
TJ =+25C
-7.0V VI -20V, 1.0mA IO 40mA VI = -10V, 1.0mA IO 70mA TJ =+25C TJ = +125C -8V VI -20V 1.0mA IO 40mA TA = +25C,10Hz f 100kHz f = 120Hz, -8V VI -18V TJ = +25C TJ = +25C
Note: 1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used.
2
MC79LXXA/LM79LXXA
Electrical Characteristics (MC79L08A) (Continued)
(VI = -14V, IO = 40mA, CI = 0.33F, CO = 0.1F, 0C TJ +125C, unless otherwise specified) Parameter Output Voltage Line Regulation(Note1) Symbol VO VO VO VO Iq With Line With Load IQ VN RR VD TJ = +25C -10.3V VI -23V TJ = +25C -12V VI -23V 1.0mA Io 100mA 1.0mA Io 40mA Conditions Min. -7.7 -7.6 -7.6 39 Typ. -8.0 50 55 1.7 Max. Unit -8.3 175 125 80 40 -8.4 -8.4 6.0 5.5 1.5 0.1 V mV mV mV mV V mA mA mA V dB V
Load Regulation (Note1) Output Voltage Quiescent Current Quiescent Current Change Output Noise Voltage Ripple Rejection Dropout Voltage
TJ = +25C
-10.3V VI -23V, 1.0mA Io 40mA VI = -14V, 1.0mA Io 70mA Tj = +25C Tj = +125C -11.7V VI -23V 1.0mA Io 40mA Tj = +25C,10Hz f 100kHz f = 120Hz, -11V VI -21V Tj = +25C Tj = +25C
Note: 1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used.
3
MC79LXXA/LM79LXXA
Electrical Characteristics(MC79L12A) (Continued)
(VI = -19V, IO = 40mA, CI = 0.33F, CO = 0.1F, 0C TJ +125C, unless otherwise specified) Parameter Output Voltage Line Regulation (Note1) Symbol VO VO VO VO IQ With Line With Load IQ IQ VN RR VD TJ = +25C -14.5V VI -27V TJ = +25C -16V VI -27V 1.0mA IO 100mA 1.0mA IO 40mA Conditions Min. -11.4 37 Typ. 80 42 1.7 Max. 250 200 100 50 -12.6 -12.6 6.0 6.5 1.5 0.1 Unit V mV mV mV mV V V mA mA mA V dB V
-11.5 -12.0 -12.5
Load Regulation (Note1) Output Voltage Quiescent Current Quiescent Current Change Output Noise Voltage Ripple Rejection Dropout Voltage
TJ = +25C
-14.5V > VI > -27V, 1.0mA IO 40mA -11.4 VI = -19V, 1.0mA IO 70mA TJ = +25C TJ = +125C -16V VI -27V 1.0mA IO 40mA TA = +25C,10Hz f 100kHz f = 120Hz, -15V VI -25V TJ = +25C TJ = +25C
Note: 1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used.
4
MC79LXXA/LM79LXXA
Electrical Characteristics(MC79L15A) (Continued)
(VI = -23V, IO = 40mA, CI = 0.33F, CO = 0.1F, 0C TJ +125C, unless otherwise specified) Parameter Output Voltage Line Regulation (Note1) Symbol VO VO VO VO IQ With Line With Load IQ IQ VN RR VD TJ = +25C -17.5V VI -30V TJ = +25C -20V VI -30V 1.0mA IO 100mA 1.0mA IO 40mA Conditions Min. -14.25 34 Typ. 90 39 1.7 Max. 300 250 150 75 -15.75 -15.75 6.0 6.5 1.5 0.1 Unit V mV mV mV mV V V mA mA mA V dB V
-14.4 -15.0 -15.6
Load Regulation (Note1) Output Voltage Quiescent Current Quiescent Current Change Output Noise Voltage Ripple Rejection Dropout Voltage
TJ = +25C
-17.5V VI -30V, 1.0mA IO 40mA -14.25 VI = -23V, 1.0mA IO 70mA TJ = +25C TJ = +125C -20V VI -30V 1.0mA IO 40mA TA = +25C,10Hz f 100kHz f = 120Hz, -18.5V VI -28.5V TJ = +25C TJ = +25C
Note: 1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used.
5
MC79LXXA/LM79LXXA
Electrical Characteristics(MC79L18A) (Continued)
(VI = -27V, IO = 40mA, CI = 0.33F, CO = 0.1F, 0C TJ +125C, unless otherwise specified) Parameter Output Voltage Line Regulation (Note1) Symbol VO VO VO VO IQ With Line With Load IQ IQ VN RR VD TJ = +25C -20.7V VI -33V TJ = +25C -21V VI -33V 1.0mA IO 100mA 1.0mA IO 40mA Conditions Min. Typ. -17.1 33 150 48 1.7 Max. 325 275 170 85 -18.9 -18.9 6.5 6.0 1.5 0.1 Unit V mV mV mV mV V V mA mA mA V dB V
-17.3 -18.0 -18.7
Load Regulation (Note1) Output Voltage Quiescent Current Quiescent Current Change Output Noise Voltage Ripple Rejection Dropout Voltage
TJ = +25C
-20.7V > VI > -33V, 1.0mA IO 40mA -17.1 VI = -27V, 1.0mA IO 70mA TJ = +25C TJ = +125C -21V VI -33V 1.0mA IO 40mA TA =+25C,10Hz f 100kHz f = 120Hz, -23V VI -33V TJ = +25C TJ = +25C
Note: 1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used.
6
MC79LXXA/LM79LXXA
Electrical Characteristics(MC79L24A) (Continued)
(VI = -33V, IO = 40mA, CI = 0.33F, CO = 0.1F, 0C TJ +125C, unless otherwise specified) Parameter Output Voltage Line Regulation (Note1) Symbol VO VO VO VO IQ With Line With Load IQ IQ VN RR VD TJ = +25C -27V VI -38V TJ = +25C -28V VI -38V 1.0mA IO 100mA 1.0mA IO 40mA Conditions Min. -23 -22.8 31 Typ. -24 200 47 1.7 Max. -25 350 300 200 100 -25.2 -25.2 6.5 6.0 1.5 0.1 Unit V mV mV mV mV V V mA mA mA V dB V
Load Regulation (Note1) Output Voltage Quiescent Current Quiescent Current Change Output Noise Voltage Ripple Rejection Dropout Voltage
TJ = +25C
-27V VI -38V, 1.0mA IO 40mA -22.8 VI = -33V, 1.0mA IO 70mA TJ = +25C TJ = +125C -28V VI -38V 1.0mA IO 40mA TA = +25C,10Hz f 100kHz f = 120Hz, -29V VI -35V TJ = +25C TJ = +25C
Note: 1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used.
7
MC79LXXA/LM79LXXA
Typical Application
Design Considerations
The MC79LXXA/LM79LXXA 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 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 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 0.33F 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.
LM78LXXA MC78LXXA
I
MC79LXXA LM79LXXA
LM79LXXA MC79LXXA
Figure 1. Positive And Negative Regulator
Figure 2. Typical Application
A common ground is required between the Input and the output voltages. The input voltage must remain typically 2.0V above the output voltage even during the low point on the input ripple voltage. * C1 is required if regulator is located an appreciable distance from power supply filter. * CO improves stability and transient response.
8
MC79LXXA/LM79LXXA
Mechanical Dimensions
Package Dimensions in millimeters
TO-92
4.58 -0.15
+0.25
14.47 0.40
0.46 0.10
4.58 0.20
1.27TYP [1.27 0.20] 3.60 0.20
3.86MAX
1.27TYP [1.27 0.20]
0.38 -0.05
+0.10
1.02 0.10
0.38 -0.05
+0.10
(R2.29)
(0.25)
9
MC79LXXA/LM79LXXA
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
8-SOP
MIN 1.55 0.20 0.061 0.008 0.1~0.25 0.004~0.001
#1
#8 4.92 0.20 0.194 0.008 5.13 MAX 0.202
( #4 #5 6.00 0.30 0.236 0.012
+0.10 0.15 -0.05 +0.004 0.006 -0.002
0.56 ) 0.022 1.80 MAX 0.071 MAX0.10 MAX0.004 3.95 0.20 0.156 0.008 5.72 0.225 0.50 0.20 0.020 0.008
10
0~
8
1.27 0.050
0.41 0.10 0.016 0.004
MC79LXXA/LM79LXXA
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
SOT-89
4.50 0.20 1.65 0.10 C0.2
(0.50)
1.50 0.20 (0.40)
2.50 0.20
0.50 0.10 1.50 TYP 1.50 TYP
0.40 0.10 0.40
+0.10 -0.05
(1.10)
4.10 0.20
11
MC79LXXA/LM79LXXA
Ordering Information
Product Number LM79L05ACZ Product Number MC79L05ACP MC79L08ACP MC79L12ACP MC79L15ACP MC79L18ACP MC79L24ACP MC79L05ACD MC79L15ACD MC79L05ACH 8-SOP SOT-89 TO-92 0 ~ +125C Package TO-92 Package Operating Temperature 0 ~ +125C Operating Temperature
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.
www.fairchildsemi.com 12/11/02 0.0m 001 Stock#DSxxxxxxxx 2002 Fairchild Semiconductor Corporation
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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