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MC79L05A / LM79L05A — 3-Terminal 0.1 A Negative Voltage Regulator
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
MC79L05A / LM79L05A Rev. 1.1.0 1
December 2012
MC79L05A / LM79L05A
3-Terminal 0.1 A Negative Voltage Regulator
Features
• Output Current up to 100 mA
• No External Components
• Internal Thermal Over load Protection
• Internal Short-Circuit Current Limiting
• Output Voltage Offered in ±5% Tolerance
• Output Voltage: -5 V
Ordering Information
Block Diagram
Figure 1. Block Diagram
Part Number Operating Tem-
perature Range Top Mark Package Packing Method
MC79L05ACHX 0 ~ +125°C9A SOT-89 Tape and Reel
MC79L05ACP MC79L05ACP TO-92 Bulk
LM79L05ACZ LM79L05ACZ TO-92 Bulk
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
Description
These regulators employ internal current limiting and
thermal shutdown.
TO-92
1.GND 2.Input 3.Output
1
SOT-89
1
MC79L05A / LM79L05A — 3-Terminal 0.1 A Negative Voltage Regulator
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
MC79L05A / LM79L05A Rev. 1.1.0 2
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the re co mmen ded operating conditions and s tres si ng the parts to these level s i s not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.
Electrical Characteristics
VI = -10 V, IO = 40 mA, CI = 0.33 μF, CO = 0.1 μF, 0°C ≤ TJ ≤ +125°C, unless otherwise specified.
Note:
1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account separately. Pulse testing with low duty is used.
Symbol Parameter Value Unit
VIInput Voltage -30 V
TOPR Operating Temperature Range 0 ~ +125 °C
TSTG Storage Temperature Range -65 ~ +150 °C
Symbol Parameter Conditions Min. Typ. Max. Unit
VOOutput Voltage TJ = +25°C -4.8 -5.0 -5.2 V
ΔVOLine Regulation (1) TJ =+25°C-7.0 V ≥ VI ≥ -20 V 15 150 mV
-8 V ≥ VI ≥ -20 V 100 mV
ΔVOLoad Regulation (1) TJ =+25°C1.0 mA ≤ IO ≤ 100 mA 20 60 mV
1.0 mA ≤ IO ≤ 40 mA 10 30 mV
VOOutput Voltage -7.0 V ≥ VI ≥ -20 V, 1.0 mA ≤ IO ≤ 40 mA -4.75 -5.25 V
VI = -10 V, 1.0 mA ≤ IO ≤ 70 mA -4.75 -5.25 V
IQQuiescent Current TJ = +25°C2.05.5
mA
TJ = +125°C6.0
ΔIQQuiescent
Current Change With Line -8 V ≥ VI ≥ -20 V 1.5 mA
ΔIQWith Load 1.0 mA ≤ IO ≤ 40 mA 0.1 mA
VNOutput Noise Voltage TA = +25°C,10 Hz ≤ f ≤ 100 kHz 30 μV
RR Ripple Rejection f = 120 Hz, -8 V ≥ VI ≥ -18 V, TJ = +25°C41 60 dB
VDDropout Voltage TJ = +25°C1.7V
MC79L05A / LM79L05A — 3-Terminal 0.1 A Negative Voltage Regulator
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
MC79L05A / LM79L05A Rev. 1.1.0 3
Typical Application
Design Considerations
The MC79L05A / LC79L05A 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 maxi-
mum current the circuit will pass. In many low-current applications, compensation capacitors are not required. How-
ever, it is recommended that the reg ulator input be bypa ss ed with a ca pacitor if the regulat or i s co nne ct ed 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 ensure stable operation under all load conditions. A 0.33 μF
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.
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.
A common ground i s require d between the inpu t and the output vo lta ges. The input v olt age must re main typica lly 2.0 V
above the output voltage, even during the low point on the input ripple voltage.
* CI is required if regulator is located an appreciable distance from power supply filter.
** CO improves stability and transient response.
Figure 2. Positive And Negative Regulator Figure 3. Typical Application
LM78L05A
MC78L05A
LM79L05A
MC79L05A
IMC79L05A
LM79L05A
MC79L05A / LM79L05A — 3-Terminal 0.1 A Negative Voltage Regulator
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
MC79L05A / LM79L05A Rev. 1.1.0 4
Physical Dimensions
Figure 4. 3-Lead, SOT-89, JEDEC TO-243, Option AA
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notic e. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor represe ntative to verify or
obtain the most recent revision. Package specifica tions do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild produ cts.
Always visit Fairchild Semiconduct or’s online packaging are a for the most recent package drawings :
http://www.fairchildsemi.com/packaging/.
For current tape an d reel specifications, visit Fair child Semiconductor’s online pac kaging area:
http://www.fairchildsemi.com/products/discrete/pdf/sot89_tr.pdf.
SOT-89
2.00
MIN
0.50
45°
X
5.30
MIN
1.50
2.23
MIN
0.96
MIN
0.90
MIN
2X
3.00
MIN
90°
4.50
3.90
C
1.30
0.89
0.54
1.50
0.52
0.30
(2X)
C
4.70
4.30
C
1.87
1.50
C
1.40
2.70
2.30
C
3.00
0.30
45°
X
123
1
3
0.10
M
C
AB
A
B
1.70
1.30
C
SEATING PLANE
C
2.70
0.35
0.60
0.40
C
0.50
0.35
2.29
2.13
NOTES: UNLESS OTHERWISE SPECIFIED.
A. REFERENCE TO JEDEC TO-243 VARIATION AA.
B. ALL DIMENSIONS ARE IN MILLIMETERS.
C
DOES NOT COMPLY JEDEC STANDARD VALUE.
D. DIMENSIONS ARE EXCLUSIVE OF BURRS,
MOLD FLASH AND TIE BAR PROTRUSION.
E. DIMENSION AND TOLERANCE AS PER ASME
Y14.5-1994.
F. DRAWING FILE NAME: MA03CREV2
LAND PATTERN
RECOMMENDATION
C
L
SYMM
132
MC79L05A / LM79L05A — 3-Terminal 0.1 A Negative Voltage Regulator
© 2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
MC79L05A / LM79L05A Rev. 1.1.0 5
Physical Dimensions (Continued)
Figure 5. 3-Lead, TO-92, Molded, Standard Straight Lead
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notic e. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor represe ntative to verify or
obtain the most recent revision. Package specifica tions do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild produ cts.
Always visit Fairchild Semiconduct or’s online packaging are a for the most recent package drawings :
http://www.fairchildsemi.com/packaging/.
D
TO-92 Bulk Type
© Fairchild Semiconductor Corporation www.fairchildsemi.com
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Rev. I63
®
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