MC79L00, A
Series
Three-Terminal Low Current
Negative Voltage Regulators
The MC79L00, A Series negative voltage regulators are inexpensive,
easy–to–use devices suitable for numerous applications requiring up to100
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 MC79L00 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.
•
No External Components Required
THREE–TERMINAL LOW
CURRENT NEGATIVE FIXED
VOLTAGE REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
•
•
•
•
•
Internal Short Circuit Current Limiting
Internal Thermal Overload Protection
Low Cost
Complementary Positive Regulators Offered (MC78L00 Series)
Available in Either
±5%
(AC) or
±10%
(C) Selections
P SUFFIX
PLASTIC PACKAGE
CASE 29
Pin 1. Ground
2. Input
3. Output
1
2
3
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SOP–8)*
Vout
Vin
Vin
NC
5.
6.
7.
8.
GND
Vin
Vin
NC
Pin 1.
2.
3.
4.
Representative Schematic Diagram
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 Motorola sales
*
office for information.
Q14
Q9
R4
Q12
Q13
R16
Output
R9
R17
* SOP–8 is an internally modified SO–8 package.
Pins 2, 3, 6, and 7 are electrically common to the
die attach flag. This internal lead frame modifica-
tion decreases package thermal resistance and
increases power dissipation capability when
appropriately mounted on a printed circuit board.
SOP–8 conforms to all external dimensions of the
standard SO–8 package.
R1
Device No.
±10%
MC79L05C
MC79L12C
MC79L15C
MC79L18C
MC79L24C
Device No.
5%
MC79L05AC
MC79L12AC
MC79L15AC
MC79L18AC
MC79L24AC
Nominal
Voltage
–5.0
–12
–15
–18
–24
ORDERING INFORMATION
Device
MC79LXXACD*
MC79LXXACP
MC79LXXCP
MC79LXXABD*
MC79LXXABP*
TJ = –40° to +125°C
TJ = 0° to +125°C
Operating
Temperature Range
Package
SOP–8
Plastic Power
Plastic Power
SOP–8
Plastic Power
XX indicates nominal voltage
MOTOROLA ANALOG IC DEVICE DATA
3–235
MC79L00, A Series
MAXIMUM RATINGS
(TA = +25°C, unless otherwise noted.)
Rating
Input Voltage (–5 V)
Input Voltage
(–12, –15, –18 V)
Input Voltage
(–24 V)
Storage Temperature Range
Junction Temperature
0°C < TJ < +125°C (for MC79LXXAC)).
MC79L05C, AB
Characteristics
Output Voltage (TJ = +25°C)
Input Regulation
(TJ = +25°C)
–7.0 Vdc
≥
VI
≥
–20 Vdc
–8.0 Vdc
≥
VI
≥
–20 Vdc
Load Regulation
TJ = +25°C, 1.0 mA
≤
IO
≤
100 mA
1.0 mA
≤
IO
≤
40 mA
Output Voltage
–7.0 Vdc
≥
VI
≥
–20 Vdc, 1.0 mA
≤
IO
≤
40 mA
VI = –10 Vdc, 1.0 mA
≤
IO
≤
70 mA
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
Input Bias Current Change
–8.0 Vdc
≥
VI
≥
–20 Vdc
1.0 mA
≤
IO
≤
40 mA
Output Noise Voltage
(TA = +25°C, 10 Hz
≤
f
≤
100 kHz)
Ripple Rejection
(–8.0
≥
VI
≥
–18 Vdc, f = 120 Hz, TJ = +25°C)
Dropout Voltage (IO = 40 mA, TJ = +25°C)
0°C < TJ < +125°C (for MC79LXXAB)).
MC79L12C, AB
Characteristics
Output Voltage (TJ = +25°C)
Input Regulation
(TJ = +25°C)
–14.5 Vdc
≥
VI
≥
–27 Vdc
–16 Vdc
≥
VI
≥
–27 Vdc
Load Regulation
TJ = +25°C, 1.0 mA
≤
IO
≤
100 mA
1.0 mA
≤
IO
≤
40 mA
Output Voltage
–14.5 Vdc
≥
VI
≥
–27 Vdc, 1.0 mA
≤
IO
≤
40 mA
VI = –19 Vdc, 1.0 mA
≤
IO
≤
70 mA
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
Input Bias Current Change
–16 Vdc
≥
VI
≥
–27 Vdc
1.0 mA
≤
IO
≤
40 mA
Output Noise Voltage
(TA = +25°C, 10 Hz
≤
f
≤
100 kHz)
Ripple Rejection
(–15
≤
VI
≤
–25 Vdc, f = 120 Hz, TJ = +25°C)
Dropout Voltage (IO = 40 mA, TJ = +25°C)
Symbol
VO
Regline
Min
–11.1
Typ
–12
Max
–12.9
MC79L12AC, AB
Min
–11.5
Typ
–12
Max
–12.5
Unit
Vdc
mV
–
–
Regload
–
–
VO
–10.8
–10.8
IIB
–
–
IIB
–
–
Vn
RR
|VI–VO|
–
36
–
–
–
80
42
1.7
1.5
0.2
–
–
–
–
–
–
37
–
–
–
80
42
1.7
1.5
0.2
–
–
–
µV
dB
Vdc
–
–
6.5
6.0
–
–
–
–
6.5
6.0
mA
–
–
–13.2
–13.2
–11.4
–11.4
–
–
–12.6
–12.6
mA
–
–
100
50
–
–
–
–
100
50
Vdc
–
–
250
200
–
–
–
–
250
200
mV
Symbol
VO
Regline
Min
–4.6
Typ
–5.0
Max
–5.4
MC79L05AC, AB
Min
–4.8
Typ
–5.0
Max
–5.2
Unit
Vdc
mV
–
–
Regload
–
–
VO
–4.5
–4.5
IIB
–
–
IIB
–
–
Vn
RR
|VI–VO|
–
40
–
–
–
40
49
1.7
1.5
0.2
–
–
–
–
–
–
41
–
–
–
40
49
1.7
1.5
0.1
–
–
–
µV
dB
Vdc
–
–
6.0
5.5
–
–
–
–
6.0
5.5
mA
–
–
–5.5
–5.5
–4.75
–4.75
–
–
–5.25
–5.25
mA
–
–
60
30
–
–
–
–
60
30
Vdc
–
–
200
150
–
–
–
–
150
100
mV
Symbol
VI
Value
–30
–35
–40
–65 to +150
+150
Unit
Vdc
Tstg
TJ
°C
°C
ELECTRICAL CHARACTERISTICS
(VI = –10 V, IO = 40 mA, CI = 0.33
µF,
CO = 0.1
µF,
–40°C < TJ +125°C (for MC79LXXAB),
ELECTRICAL CHARACTERISTICS
(VI = –19 V, IO = 40 mA, CI = 0.33
µF,
CO = 0.1
µF,
–40°C < TJ +125°C (for MC79LXXAC),
3–236
MOTOROLA ANALOG IC DEVICE DATA
MC79L00, A Series
ELECTRICAL CHARACTERISTICS
(VI = –23 V, IO = 40 mA, CI = 0.33
µF,
CO = 0.1
µF,
–40°C < TJ +125°C (for MC79LXXAB),
0°C < TJ < +125°C (for MC79LXXAC)).
MC79L15C
Characteristics
Output Voltage (TJ = +25°C)
Input Regulation
(TJ = +25°C)
–17.5 Vdc
≥
VI
≥
–30 Vdc
–20 Vdc
≥
VI
≥
–30 Vdc
Load Regulation
TJ = +25°C, 1.0 mA
≤
IO
≤
100 mA
1.0 mA
≤
IO
≤
40 mA
Output Voltage
–17.5 Vdc
≥
VI
≥
–Vdc, 1.0 mA
≤
IO
≤
40 mA
VI = –23 Vdc, 1.0 mA
≤
IO
≤
70 mA
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
Input Bias Current Change
–20 Vdc
≥
VI
≥
–30 Vdc
1.0 mA
≤
IO
≤
40 mA
Output Noise Voltage
(TA = +25°C, 10 Hz
≤
f
≤
100 kHz)
Ripple Rejection
(–18.5
≤
VI
≤
–28.5 Vdc, f = 120 Hz)
Dropout Voltage
IO = 40 mA, TJ = +25°C
Symbol
VO
Regline
–
–
Regload
–
–
VO
–13.5
–13.5
IIB
–
–
∆I
IB
–
–
VN
RR
|VI–VO|
–
33
–
–
–
90
39
1.7
1.5
0.2
–
–
–
–
–
–
34
–
–
–
90
39
1.7
1.5
0.1
–
–
–
µV
dB
Vdc
–
–
6.5
6.0
–
–
–
–
6.5
6.0
mA
–
–
–16.5
–16.5
–14.25
–14.25
–
–
–15.75
–15.75
mA
–
–
150
75
–
–
–
–
150
75
Vdc
–
–
300
250
–
–
–
–
300
250
mV
Min
–13.8
Typ
–15
Max
–16.2
MC79L15AC, AB
Min
–14.4
Typ
–15
Max
–15.6
Unit
Vdc
mV
ELECTRICAL CHARACTERISTICS
(VI = –27 V, IO = 40 mA, CI = 0.33
µF,
CO = 0.1
µF,
0°C < TJ > +125°C, unless otherwise noted).
MC79L18C
Characteristics
Output Voltage (TJ = +25°C)
Input Regulation
(TJ = +25°C)
–20.7 Vdc
≥
VI
≥
–33 Vdc
–21.4 Vdc
≥
VI
≥
–33 Vdc
–22 Vdc
≥
VI
≥
–33 Vdc
–21 Vdc
≥
VI
≥
–33 Vdc
Load Regulation
TJ = +25°C, 1.0 mA
≤
IO
≤
100 mA
1.0 mA
≤
IO
≤
40 mA
Output Voltage
–20.7 Vdc
≥
VI
≥
–33 Vdc, 1.0 mA
≤
IO
≤
40 mA
–21.4 Vdc
≥
VI
≥
–33 Vdc, 1.0 mA
≤
IO
≤
40 mA
VI = –27 Vdc, 1.0 mA
≤
IO
≤
70 mA
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
Input Bias Current Change
–21 Vdc
≥
VI
≥
–33 Vdc
–27 Vdc
≥
VI
≥
–33 Vdc
1.0 mA
≤
IO
≤
40 mA
Output Noise Voltage
(TA = +25°C, 10 Hz
≤
f
≤
100 kHz)
Ripple Rejection
(–23
≤
VI
≤
–33 Vdc, f = 120 Hz, TJ = +25°C)
Dropout Voltage
IO = 40 mA, TJ = +25°C
Symbol
VO
Regline
–
–
–
–
Regload
–
–
VO
–
–16.2
–16.2
IIB
–
–
IIB
–
–
–
Vn
RR
|VI–VO|
–
32
–
–
–
–
150
46
1.7
–
1.5
0.2
–
–
–
–
–
–
–
33
–
–
–
–
150
48
1.7
1.5
–
0.1
–
–
–
µV
dB
Vdc
–
–
6.5
6.0
–
–
–
–
6.5
6.0
mA
–
–
–
–
–19.8
–19.8
–17.1
–
–17.1
–
–
–
–18.9
–
–18.9
mA
–
–
170
85
–
–
–
–
170
85
Vdc
–
–
–
–
–
325
275
–
–
–
–
–
–
–
–
–
325
–
–
275
mV
Min
–16.6
Typ
–18
Max
–19.4
Min
–17.3
MC79L18AC
Typ
–18
Max
–18.7
Unit
Vdc
mV
MOTOROLA ANALOG IC DEVICE DATA
3–237
MC79L00, A Series
ELECTRICAL CHARACTERISTICS
(VI = –33 V, IO = 40 mA, CI = 0.33
µF,
CO = 0.1
µF,
0°C < TJ < +125°C, unless otherwise noted).
MC79L24C
Characteristics
Output Voltage (TJ = +25°C)
Input Regulation
(TJ = +25°C)
–27 Vdc
≥
VI
≥
–38 Vdc
–27.5 Vdc
≥
VI
≥
–38 Vdc
–28 Vdc
≥
VI
≥
–38 Vdc
Load Regulation
TJ = +25°C, 1.0 mA
≤
IO
≤
100 mA
1.0 mA
≤
IO
≤
40 mA
Output Voltage
–27 Vdc
≥
VI
≥
–38 V, 1.0 mA
≤
IO
≤
40 mA
–28 Vdc
≥
VI
≥
–38 Vdc, 1.0 mA
≤
IO
≤
40 mA
VI = –33 Vdc, 1.0 mA
≤
IO
≤
70 mA
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
Input Bias Current Change
–28 Vdc
≥
VI
≥
–38 Vdc
1.0 mA
≤
IO
≤
40 mA
Output Noise Voltage
(TA = +25°C, 10 Hz
≤
f
≤
100 kHz)
Ripple Rejection
(–29
≤
VI
≤
–35 Vdc, f = 120 Hz, TJ = +25°C)
Dropout Voltage
IO = 40 mA, TJ = +25°C
Symbol
VO
Regline
–
–
–
Regload
–
–
VO
–
–21.4
–21.4
IIB
–
–
∆I
IB
–
–
Vn
RR
|VI–VO|
–
30
–
–
–
200
43
1.7
1.5
0.2
–
–
–
–
–
–
31
–
–
–
200
47
1.7
1.5
0.1
–
–
–
µV
dB
Vdc
–
–
6.5
6.0
–
–
–
–
6.5
6.0
mA
–
–
–
–
–26.4
–26.4
–22.8
–
–22.8
–
–
–
–25.2
–
–25.2
mA
–
–
200
100
–
–
–
–
200
100
Vdc
–
–
–
–
350
300
–
–
–
–
–
–
350
–
300
mV
Min
–22.1
Typ
–24
Max
–25.9
Min
–23
MC79L24AC
Typ
–24
Max
–25
Unit
Vdc
mV
APPLICATIONS INFORMATION
Design Considerations
The MC79L00, A 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
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. 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.
Figure 1. Positive and Negative Regulator
Input
+Vin
0.33µF
MC78LXX
0.1µF
+VO
Figure 2. Standard Application
MC79LXX
CO**
0.1µF
Output
CI*
0.33µF
0.1µF
–Vin
0.33µF
MC79LXX
–VO
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.
* CI is required if regulator is located an appreciable
*
distance from the power supply filter
** CO improves stability and transient response.
3–238
MOTOROLA ANALOG IC DEVICE DATA
MC79L00, A Series
TYPICAL CHARACTERISTICS
(TA = +25°C, unless otherwise noted.)
Figure 4. Dropout Voltage versus
Junction Temperature
V I –V O , INPUT/OUTPUT DIFFERENTIAL
VOLTAGE (V)
–2.5
–2.0
–1.5
IO = 1.0 mA
–1.0
–0.5
0
Dropout of Regulation is
defined when
∆V
O = 2% of VO
Figure 3. Dropout Characteristics
8.0
VO , OUTPUT VOLTAGE (V)
MC79L05C
VO = –5.0 V
TJ = 25°C
IO = 1.0 mA
IO = 100 mA
6.0
IO = 70 mA
IO = 40 mA
4.0
2.0
IO = 40 mA
0
0
–2.0
–4.0
–6.0
Vin, INPUT VOLTAGE (V)
–0.8
–10
0
25
50
75
100
TJ, JUNCTION TEMPERATURE (°C)
125
Figure 5. Input Bias Current versus
Ambient Temperature
4.2
I IB , INPUT BIAS CURRENT (mA)
4.0
3.8
3.6
3.4
3.2
3.0
0
0
MC79L05C
Vin = –10 V
VO = –5.0 V
IO = 40 mA
25
50
75
100
TA, AMBIENT TEMPERATURE (°C)
125
I IB , INPUT BIAS CURRENT (mA)
5.0
4.0
3.0
2.0
1.0
0
Figure 6. Input Bias Current versus
Input Voltage
MC79L05C
VO = –5.0 V
IO = 40 mA
0
–5.0
–10
–15
–20
–25
–30
Vin, INPUT VOLTAGE (V)
–35
–40
Figure 7. Maximum Average Power Dissipation
versus Ambient Temperature (TO–92)
10,000
R
θ
JA , THERMAL RESISTANCE
JUNCTION–TO–AIR (
°
C/W)
Figure 8. SOP–8 Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
170
150
130
110
90
70
50
30
R
θJA
0
10
PD(max) for TA = +50°C
3.2
2.8
2.4
PD, MAXIMUM POWER DISSIPATION (W)
P D , POWER DISSIPATION (mW)
1,000
No Heatsink
L
100
R
ΘJA
= 200°C/W
PD(max) to 25°C = 625 mW
10
25
50
75
100
125
TA, AMBIENT TEMPERATURE (°C)
150
20
30
L, LENGTH OF COPPER (mm)
MOTOROLA ANALOG IC DEVICE DATA
ÎÎÎ ÎÎÎ
ÎÎÎ ÎÎÎ
ÎÎÎÎÎÎÎ
Î Î
2.0 oz.
Copper
L
3.0 mm
40
Graph represents symmetrical layout
2.0
1.6
1.2
0.8
0.4
50
3–239
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