KA79L05A — 3-Terminal 0.1 A Negative Voltage Regulator
December 2012
KA79L05A
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
Description
These regulators employ internal current limiting and
thermal shutdown.
TO-92
SOT-89
1
1
1.GND 2.Input 3.Output
Ordering Information
Part Number
KA79L05AMTF
KA79L05AZTA
Operating Tem-
perature Range
0 ~ +125°C
Top Mark
9A
KA79L05AZ
Package
SOT-89
TO-92
Packing Method
Tape and Reel
Ammo
Block Diagram
Q10
Q11
R26
Q12
R15
R22
Q5
D3
R23+R21
D2
R18
Q15
Q6
Q7
R
Q4
Q17
C1
Q16Q14
R28
R24
Q13
R25
Q9
R29 R7
R17
R16
Q8 Q1
R1
R2
D1
Q2 Q3
R6
R3
R4
R5
Figure 1. Block Diagram
© 2002 Fairchild Semiconductor Corporation
KA79L05A Rev. 1.1.0
www.fairchildsemi.com
1
KA79L05A — 3-Terminal 0.1 A Negative Voltage Regulator
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is 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 T
A
= 25°C unless otherwise noted.
Symbol
V
I
T
OPR
T
STG
Input Voltage
Parameter
Operating Temperature Range
Storage Temperature Range
Value
-30
0 ~ +125
-65 ~ +150
Unit
V
°C
°C
Electrical Characteristics
V
I
= -10 V, I
O
= 40 mA, C
I
= 0.33
μF,
C
O
= 0.1
μF,
0°C
≤
T
J
≤
+125°C, unless otherwise specified.
Symbol
V
O
ΔV
O
ΔV
O
V
O
I
Q
ΔI
Q
ΔI
Q
V
N
RR
V
D
Parameter
Output Voltage
Line Regulation
(1)
Load Regulation
(1)
Output Voltage
Quiescent Current
Quiescent
Current Change
With Line
T
J
= +25°C
T
J
=+25°C
T
J
=+25°C
Conditions
-7.0 V
≥
V
I
≥
-20 V
-8 V
≥
V
I
≥
-20 V
1.0 mA
≤
I
O
≤
100 mA
1.0 mA
≤
I
O
≤
40 mA
Min. Typ. Max. Unit
-4.8
-5.0
15
20
10
-4.75
-4.75
2.0
-5.2
150
100
60
30
-5.25
-5.25
5.5
6.0
1.5
0.1
30
41
60
1.7
V
mV
mV
mV
mV
V
V
mA
mA
mA
μV
dB
V
-7.0 V
≥
V
I
≥
-20 V, 1.0 mA
≤
I
O
≤
40 mA
V
I
= -10 V, 1.0 mA
≤
I
O
≤
70 mA
T
J
= +25°C
T
J
= +125°C
-8 V
≥
V
I
≥
-20 V
T
A
= +25°C,10 Hz
≤
f
≤
100 kHz
f = 120 Hz, -8 V
≥
V
I
≥
-18 V, T
J
= +25°C
T
J
= +25°C
With Load 1.0 mA
≤
I
O
≤
40 mA
Output Noise Voltage
Ripple Rejection
Dropout Voltage
Note:
1. Load and line regulation are specified at constant junction temperature. Changes in V
O
due to heating effects
must be taken into account separately. Pulse testing with low duty is used.
© 2002 Fairchild Semiconductor Corporation
KA79L05A Rev. 1.1.0
www.fairchildsemi.com
2
KA79L05A — 3-Terminal 0.1 A Negative Voltage Regulator
Typical Application
Design Considerations
The KA79L05A fixed voltage-regulator is 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 cir-
cuit 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 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 tech-
niques 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.
KA79L05A
I
KA79L05A
KA79L05A
Figure 2. Positive and Negative Regulator
Figure 3. Typical 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.
* C
I
is required if regulator is located an appreciable distance from power supply filter.
** C
O
improves stability and transient response.
© 2002 Fairchild Semiconductor Corporation
KA79L05A Rev. 1.1.0
www.fairchildsemi.com
3
KA79L05A — 3-Terminal 0.1 A Negative Voltage Regulator
Physical Dimensions
SOT-89
1.87
C
1.50
1.40
4.70
C
4.30
A
0.30 X 45°
B
0.50 X 45°
2.23 MIN
4.50
C
3.90
1.30
0.89
0.54
1.50
3.00
1
2
3
2.70
C
2.30
C SYMM
L
5.30 MIN
90°
0.52
(2X) C
0.30
0.10
M
C A B
0.90 MIN 2X
1.70
C
1.30
2.00 MIN
1
2
3
0.96 MIN
1.50
3.00 MIN
LAND PATTERN
RECOMMENDATION
C
SEATING PLANE
0.60
C
0.40
0.50
0.35
0.35
3
1
2.70
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
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 notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area:
http://www.fairchildsemi.com/products/discrete/pdf/sot89_tr.pdf.
© 2002 Fairchild Semiconductor Corporation
KA79L05A Rev. 1.1.0
www.fairchildsemi.com
4
KA79L05A — 3-Terminal 0.1 A Negative Voltage Regulator
Physical Dimensions
(Continued)
TO-92 Ammo Type
D
Figure 5. 3-Lead, TO-92, Molded, 0.200 in Line Spacing Lead Form
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area:
http://www.fairchildsemi.com/products/discrete/pdf/to92_tr.pdf.
© 2002 Fairchild Semiconductor Corporation
KA79L05A Rev. 1.1.0
www.fairchildsemi.com
5
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