MC79L00A Series
100 mA Negative Voltage
Regulators
The MC79L00A Series negative voltage regulators are
inexpensive, easy−to−use devices suitable for numerous applications
requiring up to 100 mA. Like the higher powered MC7900 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 MC79L00A 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
http://onsemi.com
THREE−TERMINAL LOW
CURRENT NEGATIVE FIXED
VOLTAGE REGULATORS
MARKING
DIAGRAMS
8
1
SOIC−8
D SUFFIX
CASE 751
Pin 1.
2.
3.
4.
5.
6.
7.
8.
V
out
V
in
V
in
NC
GND
V
in
V
in
NC
8
9Lxxx
ALYWx
G
1
•
•
•
•
•
•
No External Components Required
Internal Short Circuit Current Limiting
Internal Thermal Overload Protection
Low Cost
Complementary Positive Regulators Offered (MC78L00 Series)
Pb−Free Packages are Available
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
* 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.
Q14
Q9
R4
Q12
Q13
R16
Output
R9
R17
3
STRAIGHT LEAD
BULK PACK
12
1
TO−92
P SUFFIX
CASE 29
2
3
BENT LEAD
TAPE & REEL
AMMO PACK
Pin 1. Ground
2. Input
3. Output
R1
MC79L
xxxxx
ALYWWG
G
Figure 1. Representative Schematic Diagram
xxx
= Specific Device Code
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W, WW = Work Week
y
= B or C
G
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
©
Semiconductor Components Industries, LLC, 2008
May, 2008
−
Rev. 9
1
Publication Order Number:
MC79L00/D
MC79L00A Series
MAXIMUM RATINGS
(T
A
= +25°C, unless otherwise noted.)
Rating
Input Voltage
(−5 V)
(−12,
−15, −18
V)
(−24 V)
Symbol
V
I
Value
−30
−35
−40
Unit
Vdc
Power Dissipation
Case 29 (TO−92 Type)
T
A
= 25°C
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Case 751 (SOIC−8 Type) (Note 1)
T
A
= 25°C
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Storage Temperature Range
Junction Temperature
PD
R
qJA
R
qJC
PD
R
qJA
R
qJC
T
stg
T
J
Internally Limited
160
83
Internally Limited
180
45
−65
to +150
+150
W
°C/W
°C/W
W
°C/W
°C/W
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. SOIC−8 Junction−to−Ambient Thermal Resistance is for minimum recommended pad size. Refer to Figure 9 for Thermal Resistance variation
versus pad size.
*This device series contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per MIL_STD_883, Method 3015
Machine Model Method 200 V.
0°C < T
J
< +125°C (for MC79LXXAC)).
ELECTRICAL CHARACTERISTICS
(V
I
=
−10
V, I
O
= 40 mA, C
I
= 0.33
mF,
C
O
= 0.1
mF,
−40°C
< T
J
+125°C (for MC79LXXAB),
MC79L05AC, AB
Characteristics
Output Voltage (T
J
= +25°C)
Input Regulation (T
J
= +25°C)
−7.0
Vdc
≥
V
I
≥
−20
Vdc
−8.0
Vdc
≥
V
I
≥
−20
Vdc
Load Regulation
T
J
= +25°C, 1.0 mA
≤
I
O
≤
100 mA
1.0 mA
≤
I
O
≤
40 mA
Output Voltage
−7.0
Vdc
≥
V
I
≥
−20
Vdc, 1.0 mA
≤
I
O
≤
40 mA
V
I
=
−10
Vdc, 1.0 mA
≤
I
O
≤
70 mA
Input Bias Current
(T
J
= +25°C)
(T
J
= +125°C)
Input Bias Current Change
−8.0
Vdc
≥
V
I
≥
−20
Vdc
1.0 mA
≤
I
O
≤
40 mA
Output Noise Voltage (T
A
= +25°C, 10 Hz
≤
f
≤
100 kHz)
Ripple Rejection (−8.0
≥
V
I
≥
−18
Vdc, f = 120 Hz, T
J
= +25°C)
Dropout Voltage (I
O
= 40 mA, T
J
= +25°C)
Symbol
V
O
Reg
line
Min
−4.8
−
−
−
−
−4.75
−4.75
−
−
−
−
−
41
−
Typ
−5.0
−
−
−
−
−
−
−
−
−
−
40
49
1.7
Max
−5.2
150
100
60
30
−5.25
−5.25
6.0
5.5
1.5
0.1
−
−
−
Unit
Vdc
mV
Reg
load
mV
V
O
Vdc
I
IB
mA
I
IB
mA
V
n
RR
|V
I
−V
O
|
mV
dB
Vdc
http://onsemi.com
2
MC79L00A Series
0°C < T
J
< +125°C (for MC79LXXAC)).
ELECTRICAL CHARACTERISTICS
(V
I
=
−19
V, I
O
= 40 mA, C
I
= 0.33
mF,
C
O
= 0.1
mF,
−40°C
< T
J
+125°C (for MC79LXXAB),
MC79L12AC, AB
Characteristics
Output Voltage (T
J
= +25°C)
Input Regulation (T
J
= +25°C)
−14.5
Vdc
≥
V
I
≥
−27
Vdc
−16
Vdc
≥
V
I
≥
−27
Vdc
Load Regulation
T
J
= +25°C, 1.0 mA
≤
I
O
≤
100 mA
1.0 mA
≤
I
O
≤
40 mA
Output Voltage
−14.5
Vdc
≥
V
I
≥
−27
Vdc, 1.0 mA
≤
I
O
≤
40 mA
V
I
=
−19
Vdc, 1.0 mA
≤
I
O
≤
70 mA
Input Bias Current
(T
J
= +25°C)
(T
J
= +125°C)
Input Bias Current Change
−16
Vdc
≥
V
I
≥
−27
Vdc
1.0 mA
≤
I
O
≤
40 mA
Output Noise Voltage (T
A
= +25°C, 10 Hz
≤
f
≤
100 kHz)
Ripple Rejection (−15
≤
V
I
≤
−25
Vdc, f = 120 Hz, T
J
= +25°C)
Dropout Voltage (I
O
= 40 mA, T
J
= +25°C)
Symbol
V
O
Reg
line
Min
−11.5
−
−
−
−
−11.4
−11.4
Typ
−12
−
−
−
−
−
−
−
−
−
−
80
42
1.7
Max
−12.5
250
200
100
50
−12.6
−12.6
Unit
Vdc
mV
Reg
load
mV
V
O
Vdc
I
IB
−
−
−
−
−
37
−
6.5
6.0
1.5
0.2
−
−
−
mA
I
IB
mA
V
n
RR
|V
I
−V
O
|
mV
dB
Vdc
0°C < T
J
< +125°C (for MC79LXXAC)).
ELECTRICAL CHARACTERISTICS
(V
I
=
−23
V, I
O
= 40 mA, C
I
= 0.33
mF,
C
O
= 0.1
mF,
−40°C
< T
J
+125°C (for MC79LXXAB),
MC79L15AC, AB
Characteristics
Output Voltage (T
J
= +25°C)
Input Regulation (T
J
= +25°C)
−17.5
Vdc
≥
V
I
≥
−30
Vdc
−20
Vdc
≥
V
I
≥
−30
Vdc
Load Regulation
T
J
= +25°C, 1.0 mA
≤
I
O
≤
100 mA
1.0 mA
≤
I
O
≤
40 mA
Output Voltage
−17.5
Vdc
≥
V
I
≥
−Vdc,
1.0 mA
≤
I
O
≤
40 mA
V
I
=
−23
Vdc, 1.0 mA
≤
I
O
≤
70 mA
Input Bias Current
(T
J
= +25°C)
(T
J
= +125°C)
Input Bias Current Change
−20
Vdc
≥
V
I
≥
−30
Vdc
1.0 mA
≤
I
O
≤
40 mA
Output Noise Voltage (T
A
= +25°C, 10 Hz
≤
f
≤
100 kHz)
Ripple Rejection (−18.5
≤
V
I
≤
−28.5
Vdc, f = 120 Hz)
Dropout Voltage I
O
= 40 mA, T
J
= +25°C
Symbol
V
O
Reg
line
Min
−14.4
−
−
−
−
−14.25
−14.25
Typ
−15
−
−
−
−
−
−
Max
−15.6
300
250
150
75
−15.75
−15.75
Unit
Vdc
mV
Reg
load
mV
V
O
Vdc
I
IB
−
−
−
−
−
34
−
−
−
−
−
90
39
1.7
6.5
6.0
1.5
0.1
−
−
−
mA
DI
IB
mA
V
N
RR
|V
I
−V
O
|
mV
dB
Vdc
http://onsemi.com
3
MC79L00A Series
ELECTRICAL CHARACTERISTICS
(V
I
=
−27
V, I
O
= 40 mA, C
I
= 0.33
mF,
C
O
= 0.1
mF,
−40°C
< T
J
+125°C (for MC79LXXAB),
0°C < T
J
< +125°C (for MC79LXXAC), unless otherwise noted).
MC79L18AC
Characteristics
Output Voltage (T
J
= +25°C)
Input Regulation (T
J
= +25°C)
−20.7
Vdc
≥
V
I
≥
−33
Vdc
−21.4
Vdc
≥
V
I
≥
−33
Vdc
−22
Vdc
≥
V
I
≥
−33
Vdc
−21
Vdc
≥
V
I
≥
−33
Vdc
Load Regulation
T
J
= +25°C, 1.0 mA
≤
I
O
≤
100 mA
1.0 mA
≤
I
O
≤
40 mA
Output Voltage
−20.7
Vdc
≥
V
I
≥
−33
Vdc, 1.0 mA
≤
I
O
≤
40 mA
−21.4
Vdc
≥
V
I
≥
−33
Vdc, 1.0 mA
≤
I
O
≤
40 mA
V
I
=
−27
Vdc, 1.0 mA
≤
I
O
≤
70 mA
Input Bias Current
(T
J
= +25°C)
(T
J
= +125°C)
Input Bias Current Change
−21
Vdc
≥
V
I
≥
−33
Vdc
−27
Vdc
≥
V
I
≥
−33
Vdc
1.0 mA
≤
I
O
≤
40 mA
Output Noise Voltage (T
A
= +25°C, 10 Hz
≤
f
≤
100 kHz)
Ripple Rejection (−23
≤
V
I
≤
−33
Vdc, f = 120 Hz, T
J
= +25°C)
Dropout Voltage I
O
= 40 mA, T
J
= +25°C
Symbol
V
O
Reg
line
Min
−17.3
−
−
−
−
−
−
−17.1
−
−17.1
−
−
−
−
−
−
33
−
Typ
−18
−
−
−
−
−
−
−
−
−
−
−
−
−
−
150
48
1.7
Max
−18.7
325
−
−
275
170
85
−18.9
−
−18.9
6.5
6.0
1.5
−
0.1
−
−
−
Unit
Vdc
mV
Reg
load
mV
V
O
Vdc
I
IB
mA
I
IB
mA
V
n
RR
|V
I
−V
O|
mV
dB
Vdc
ELECTRICAL CHARACTERISTICS
(V
I
=
−33
V, I
O
= 40 mA, C
I
= 0.33
mF,
C
O
= 0.1
mF,
−40°C
< T
J
+125°C (for MC79LXXAB),
0°C < T
J
< +125°C (for MC79LXXAC), unless otherwise noted).
MC79L24AC
Characteristics
Output Voltage (T
J
= +25°C)
Input Regulation (T
J
= +25°C)
−27
Vdc
≥
V
I
≥
−38
Vdc
−27.5
Vdc
≥
V
I
≥
−38
Vdc
−28
Vdc
≥
V
I
≥
−38
Vdc
Load Regulation
T
J
= +25°C, 1.0 mA
≤
I
O
≤
100 mA
1.0 mA
≤
I
O
≤
40 mA
Output Voltage
−27
Vdc
≥
V
I
≥
−38
V, 1.0 mA
≤
I
O
≤
40 mA
−28
Vdc
≥
V
I
≥
−38
Vdc, 1.0 mA
≤
I
O
≤
40 mA
V
I
=
−33
Vdc, 1.0 mA
≤
I
O
≤
70 mA
Input Bias Current
(T
J
= +25°C)
(T
J
= +125°C)
Input Bias Current Change
−28
Vdc
≥
V
I
≥
−38
Vdc
1.0 mA
≤
I
O
≤
40 mA
Output Noise Voltage (T
A
= +25°C, 10 Hz
≤
f
≤
100 kHz)
Ripple Rejection (−29
≤
V
I
≤
−35
Vdc, f = 120 Hz, T
J
= +25°C)
Dropout Voltage I
O
= 40 mA, T
J
= +25°C
Symbol
V
O
Reg
line
Min
−23
−
−
−
−
−
−22.8
−
−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
Vdc
mV
Reg
load
mV
V
O
Vdc
I
IB
mA
DI
IB
mA
V
n
RR
|V
I
−V
O
|
mV
dB
Vdc
http://onsemi.com
4
MC79L00A Series
APPLICATIONS INFORMATION
Design Considerations
The MC79L00A 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
+V
in
0.33mF
MC78LXX
0.1mF
+V
O
C
I
*
0.33mF
MC79LXX
C
O
**
0.1mF
Output
0.1mF
-V
in
0.33mF
MC79LXX
-V
O
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.
* C
I
is required if regulator is located an appreciable
*
distance from the power supply filter
** C
O
improves stability and transient response.
Figure 2. Positive and Negative Regulator
Figure 3. Standard Application
http://onsemi.com
5
京公网安备 11010802033920号
EEWORLD
