©2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.2
Features
• Output Current up to 100mA
• No External Components
• Internal Thermal Over Load Protectio n
• Internal Short Circuit Current Limiting
• Output Voltage Offered in ±5% Tolerance
• Output Voltage of -5V, -8V, -12V, -15V, -18V, -24V
Description
These regulators employ intern al cur ren t limiting and
thermal shutdown, making them essentially indestructible.
TO-92
1
8-SOP
SOT-89
1
1.GND 2.Input 3. Output
1. Output 2.3.6.7. Input 5. GND 4.8. NC
1
Internal Block Diagram
Q1
Q2Q3
Q4
Q5
Q6 Q7
Q8
Q9
Q10
Q11 Q12
Q13Q14
Q15
Q16
Q17 R1
R2 R3
R4 R5
R6
R7
R15
R16 R17
R18
R26
R22
R24 R25 R29
R
R28
R23+R21
R27
D3 D2
D1
C1
GND
Output
Input
MC79LXXA/LM79LXXA
3-Terminal 0.1A Negative Voltage R egulator
MC79LXXA/LM79LXXA
2
Absolute Maximum Ratings
Electrical Characteristics(MC79L05A/LM79L05A)
(VI = -10V, IO = 40mA, CI = 0.33µF, CO = 0.1µF, 0°C ≤TJ ≤ +125°C, unless otherwise specified)
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.
Parameter Symbol Value Unit
Input Voltage (for Vo = -5V to -8V)
(for VO = -12V to -18V)
(for VO = -24V) VI-30
-35
-40 V
Operating Temperature Range TOPR 0 ~ +125 °C
Storage Temperature Range TSTG -65 ~ +150 °C
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -4.8 -5.0 -5.2 V
Line Regulation (Note1) ∆VOTJ =+25°C-7.0V ≥ VI ≥ -20V - 15 150 mV
-8V ≥ VI ≥ -20V - - 100 mV
Load Regulation (Note1) ∆VOTJ =+25°C1.0mA ≤ IO ≤ 100mA - 20 60 mV
1.0mA ≤ IO ≤ 40mA - 10 30 mV
Output Voltage VO-7.0V ≥ VI ≥ -20V, 1.0mA ≤ IO ≤ 40mA -4.75 - -5.25 V
VI = -10V, 1.0mA ≤ IO ≤ 70mA -4.75 - -5.25 V
Quiescent Current IQTJ =+25°C-2.05.5
mA
TJ = +125°C--6.0
Quiescent Current
Change With Line ∆IQ-8V ≥ VI ≥ -20V - - 1.5 mA
With Load ∆IQ1.0mA ≤ IO ≤ 40mA - - 0.1 mA
Output Noise Voltage VNTA = +25°C,10Hz ≤ f ≤ 100kHz - 30 - µV
Ripple Rejection RR f = 120Hz, -8V ≥ VI ≥ -18V
TJ = +25°C41 60 - dB
Dropout Voltage VDTJ = +25°C-1.7-V
MC79LXXA/LM79LXXA
3
Electrical Characteristics (MC79L08A) (Continued)
(VI = -14V, IO = 40mA, CI = 0.33µF, CO = 0.1µF, 0°C ≤TJ ≤ +125°C, unless otherwise specified)
Note:
1. L oad and line regu lat ion a re s pec ifie d at c ons tant junc ti on tem per atur e. Ch ange in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -7.7 -8.0 -8.3 V
Line Regulation(Note1) ∆VOTJ = +25°C-10.3V ≥ VI ≥ -23V - - 175 mV
-12V ≥ VI ≥ -23V - - 125 mV
Load Regulation (Note1) ∆VOTJ = +25°C1.0mA ≤ Io ≤ 100mA - - 80 mV
1.0mA ≤ Io ≤ 40mA - - 40 mV
Output Voltage VO-10.3V ≥ VI ≥ -23V, 1.0mA ≤ Io ≤ 40mA -7.6 - -8.4 V
VI = -14V, 1.0mA ≤ Io ≤ 70mA -7.6 - -8.4
Quiescent Current IqTj = +25°C--6.0
mA
Tj = +125°C--5.5
Quiescent Current
Change With Line ∆IQ-11.7V ≥ VI ≥ -23V - - 1.5 mA
With Load 1.0mA ≤ Io ≤ 40mA - - 0.1 mA
Output Noise Voltage VNTj = +25°C,10Hz ≤ f ≤ 100kHz - 50 - µV
Ripple Rejection RR f = 120Hz, -11V ≥ VI ≥ -21V
Tj = +25°C39 55 - dB
Dropout Voltage VDTj = +25°C-1.7-V
MC79LXXA/LM79LXXA
4
Electrical Characteristics(MC79L12A) (Continued)
(VI = -19V, IO = 40mA, CI = 0.33µF, CO = 0.1µF, 0°C ≤TJ ≤ +125°C, unless otherwise specified)
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.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -11.5 -12.0 -12.5 V
Line Regulation (Note1) ∆VOTJ = +25°C-14.5V ≥ VI ≥ -27V - - 250 mV
-16V ≥ VI ≥ -27V - - 200 mV
Load Regulation (Note1) ∆VOTJ = +25°C1.0mA ≤ IO ≤ 100mA - - 100 mV
1.0mA ≤ IO ≤ 40mA - - 50 mV
Output Voltage VO-14.5V > VI > -27V, 1.0mA ≤ IO ≤ 40mA -11.4 - -12.6 V
VI = -19V, 1.0mA ≤ IO ≤ 70mA -11.4 - -12.6 V
Quiescent Current IQTJ = +25°C--6.0
mA
TJ = +125°C--6.5
Quiescent Current
Change With Line ∆IQ-16V ≥ VI ≥ -27V - - 1.5 mA
With Load ∆IQ1.0mA ≤ IO ≤ 40mA - - 0.1 mA
Output Noise Voltage VNTA = +25°C,10Hz ≤ f ≤ 100kHz - 80 - µV
Ripple Rejection RR f = 120Hz, -15V≥ VI ≥ -25V
TJ = +25°C37 42 - dB
Dropout Voltage VDTJ = +25°C-1.7-V
MC79LXXA/LM79LXXA
5
Electrical Characteristics(MC79L15A) (Continued)
(VI = -23V, IO = 40mA, CI = 0.33µF, CO = 0.1µF, 0°C ≤TJ ≤ +125°C, unless otherwise specified)
Note:
1. L oad and line regu lat ion a re s pec ifie d at c ons tant junc ti on tem per atur e. Ch ange in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -14.4 -15.0 -15.6 V
Line Regulation (Note1) ∆VOTJ = +25°C-17.5V ≥ VI ≥ -30V - - 300 mV
-20V ≥ VI ≥ -30V - - 250 mV
Load Regulation (Note1) ∆VOTJ = +25°C1.0mA ≤ IO ≤ 100mA - - 150 mV
1.0mA ≤ IO ≤ 40mA - - 75 mV
Output Voltage VO-17.5V ≥ VI ≥ -30V, 1.0mA ≤ IO ≤ 40mA -14.25 - -15.75 V
VI = -23V, 1.0mA ≤ IO ≤ 70mA -14.25 - -15.75 V
Quiescent Current IQTJ = +25°C--6.0
mA
TJ = +125°C--6.5
Quiescent Current
Change With Line ∆IQ-20V ≥ VI ≥ -30V - - 1.5 mA
With Load ∆IQ1.0mA ≤ IO ≤ 40mA - - 0.1 mA
Output Noise Voltage VNTA = +25°C,10Hz ≤ f ≤ 100kHz - 90 - µV
Ripple Rejection RR f = 120Hz, -18.5V ≥ VI ≥ -28.5V
TJ = +25°C34 39 - dB
Dropout Voltage VDTJ = +25°C-1.7-V
MC79LXXA/LM79LXXA
6
Electrical Characteristics(MC79L18A) (Continued)
(VI = -27V, IO = 40mA, CI = 0.33µF, CO = 0.1µF, 0°C ≤TJ ≤ +125°C, unless otherwise specified)
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.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -17.3 -18.0 -18.7 V
Line Regulation (Note1) ∆VOTJ = +25°C-20.7V ≥ VI ≥ -33V - - 325 mV
-21V ≥ VI ≥ -33V - - 275 mV
Load Regulation (Note1) ∆VOTJ = +25°C1.0mA ≤ IO ≤ 100mA - - 170 mV
1.0mA ≤ IO ≤ 40mA - - 85 mV
Output Voltage VO-20.7V > VI > -33V, 1.0mA ≤ IO ≤ 40mA -17.1 - -18.9 V
VI = -27V, 1.0mA ≤ IO ≤ 70mA -17.1 - -18.9 V
Quiescent Current IQTJ = +25°C--6.5
mA
TJ = +125°C--6.0
Quiescent Current
Change With Line ∆IQ-21V ≥ VI ≥ -33V - - 1.5 mA
With Load ∆IQ1.0mA ≤ IO ≤ 40mA - - 0.1 mA
Output Noise Voltage VNTA =+25°C,10Hz ≤ f ≤ 100kHz - 150 - µV
Ripple Rejection RR f = 120Hz, -23V ≥ VI ≥ -33V
TJ = +25°C33 48 - dB
Dropout Voltage VDTJ = +25°C-1.7-V
MC79LXXA/LM79LXXA
7
Electrical Characteristics(MC79L24A) (Continued)
(VI = -33V, IO = 40mA, CI = 0.33µF, CO = 0.1µF, 0°C ≤TJ ≤ +125°C, unless otherwise specified)
Note:
1. L oad and line regu lat ion a re s pec ifie d at c ons tant junc ti on tem per atur e. Ch ange in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.
Parameter Symbol Conditions Min. Typ. Max. Unit
Output Voltage VOTJ = +25°C -23 -24 -25 V
Line Regulation (Note1) ∆VOTJ = +25°C-27V ≥ VI ≥ -38V - - 350 mV
-28V ≥ VI ≥ -38V - - 300 mV
Load Regulation (Note1) ∆VOTJ = +25°C1.0mA ≤ IO ≤ 100mA - - 200 mV
1.0mA ≤ IO ≤ 40mA - - 100 mV
Output Voltage VO-27V ≥ VI ≥ -38V, 1.0mA ≤ IO ≤ 40mA -22.8 - -25.2 V
VI = -33V, 1.0mA ≤ IO ≤ 70mA -22.8 - -25.2 V
Quiescent Current IQTJ = +25°C--6.5
mA
TJ = +125°C--6.0
Quiescent Current
Change With Line ∆IQ-28V ≥ VI ≥ -38V - - 1.5 mA
With Load ∆IQ1.0mA ≤ IO ≤ 40mA - - 0.1 mA
Output Noise Voltage VNTA = +25°C,10Hz ≤ f ≤ 100kHz - 200 - µV
Ripple Rejection RR f = 120Hz, -29V ≥ VI ≥ -35V
TJ = +25°C31 47 - dB
Dropout Voltage VDTJ = +25°C-1.7-V
MC79LXXA/LM79LXXA
8
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 re gulator input be bypassed with a capacitor if th e regulator is conn ected 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 0.33µF or larger ta nta l um , my l ar, 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 recommen ded .
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.
Figure 1. Positive And Negative Reg ulato r Figure 2. Typical Appli cat ion
LM78LXXA
MC78LXXA
LM79LXXA
MC79LXXA
IMC79LXXA
LM79LXXA
MC79LXXA/LM79LXXA
9
Mechanical Dimensions
Package Dimensions in millimeters
0.46
±0.10
1.27TYP
(R2.29)
3.86MAX
[1.27
±0.20
]1.27TYP
[1.27
±0.20
]
3.60
±0.20
14.47
±0.40
1.02
±0.10
(0.25) 4.58
±0.20
4.58
+0.25
–0.15
0.38
+0.10
–0.05
0.38
+0.10
–0.05
TO-92
MC79LXXA/LM79LXXA
10
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
4.92 ±0.20
0.194 ±0.008
0.41 ±0.10
0.016 ±0.004
1.27
0.050
5.72
0.225
1.55 ±0.20
0.061 ±0.008
0.1~0.25
0.004~0.001
6.00 ±0.30
0.236 ±0.012
3.95 ±0.20
0.156 ±0.008
0.50 ±0.20
0.020 ±0.008
5.13
0.202 MAX
#1
#4 #5
0~8°
#8
0.56
0.022
()
1.80
0.071
MAX0.10
MAX0.004
MAX
MIN
+0.10
-0.05
0.15+0.004
-0.002
0.006
8-SOP
MC79LXXA/LM79LXXA
11
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
SOT-89
0.40
±0.10
2.50
±0.20
(0.50)
(0.40)
4.10
±0.20
0.40
+0.10
–0.05
0.50
±0.10
1.65
±0.10
4.50
±0.20
1.50
±0.20
C0.2
1.50 TYP 1.50 TYP
(1.10)
MC79LXXA/LM79LXXA
12/11/02 0.0m 001
Stock#DSxxxxxxxx
2002 Fairchild Semiconductor Corporation
LIFE SU PP ORT POL ICY
FAIRCHILD’S PRODUCTS AR E NOT AUTHORIZED FOR USE AS C RITICAL COMPONENTS I N LIFE S UPPORT DEVICE S
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORA TION. As used he rein :
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.
2. A critical component in any component of a life support
device or syst em who se failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effec tiv ene ss.
www.fairchildsemi.com
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRO DUCTS HEREIN TO IMPROVE RELIABILITY, FUN C TION OR DESIGN . FAIRCHILD DO ES 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 RIG HTS, NOR THE RIGHTS OF OTHERS.
Ordering Information
Product Number Package Operating Temperature
LM79L05ACZ TO-92 0 ~ +125°C
Product Number Package Operating Temperature
MC79L05ACP
TO-92
0 ~ +125°C
MC79L08ACP
MC79L12ACP
MC79L15ACP
MC79L18ACP
MC79L24ACP
MC79L05ACD 8-SOP
MC79L15ACD
MC79L05ACH SOT-89