THREE–TERMINAL LOW
CURRENT NEGATIVE FIXED
VOLTAGE REGULATORS
ORDERING INFORMATION
Order this document by MC79L00/D
P SUFFIX
PLASTIC PACKAGE
CASE 29
Pin 1. Ground
2. Input
3. Output
3
12
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SOP–8)*
1
8
Pin 1. Vout
2. Vin
3. Vin
4. NC
5. GND
6. Vin
7. Vin
8. NC
*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.
Device No.
±10%
MC79L05C
MC79L12C
MC79L15C
MC79L18C
MC79L24C
Device No.
5% Nominal
Voltage
MC79L05AC
MC79L12AC
MC79L15AC
MC79L18AC
MC79L24AC
–5.0
–12
–15
–18
–24
Device Operating
Temperature Range Package
MC79LXXACD*
TJ = 0° to +125°C
SOP–8
Plastic PowerMC79LXXACP
Plastic PowerMC79LXXCP
MC79LXXABD*
MC79LXXABP*
SOP–8
Plastic Power
TJ = –40° to +125°C
XX indicates nominal voltage
SEMICONDUCTOR
TECHNICAL DATA
1
MOTOROLA ANALOG IC DEVICE DATA
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
•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
Representative Schematic Diagram
* 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.
R1
R2
Z1
R3
R
5
R18
Q1
R6
Q4
R7
R4
R8
Q5 Q10
Q8
R9
Q14
Q9
C
Q6 R10 R11 Q7 Q2 Q11R14 R15
Q13
Q12
R16
R17
Gnd
Output
Input
Motorola, Inc. 1996 Rev 2
MC79L00, A Series
2MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS (TA = +25°C, unless otherwise noted.)
Rating Symbol Value Unit
Input Voltage (–5 V)
Input Voltage (–12, –15, –18 V)
Input Voltage (–24 V)
VI–30
–35
–40
Vdc
Storage Temperature Range Tstg –65 to +150 °C
Junction Temperature TJ+150 °C
ELECTRICAL CHARACTERISTICS (VI = –10 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)). MC79L05C, AB MC79L05AC, AB
Characteristics Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = +25°C) VO–4.6 –5.0 –5.4 –4.8 –5.0 –5.2 Vdc
Input Regulation
(TJ = +25°C)
–7.0 Vdc ≥ VI ≥ –20 Vdc
–8.0 Vdc ≥ VI ≥ –20 Vdc
Regline
–
––
–200
150 –
––
–150
100
mV
Load Regulation
TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA
1.0 mA ≤ IO ≤ 40 mA
Regload –
––
–60
30 –
––
–60
30
mV
Output Voltage
–7.0 Vdc ≥ VI ≥ –20 Vdc, 1.0 mA ≤ IO ≤ 40 mA
VI = –10 Vdc, 1.0 mA ≤ IO ≤ 70 mA
VO–4.5
–4.5 –
––5.5
–5.5 –4.75
–4.75 –
––5.25
–5.25
Vdc
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
IIB –
––
–6.0
5.5 –
––
–6.0
5.5
mA
Input Bias Current Change
–8.0 Vdc ≥ VI ≥ –20 Vdc
1.0 mA ≤ IO ≤ 40 mA
IIB –
––
–1.5
0.2 –
––
–1.5
0.1
mA
Output Noise Voltage
(TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) Vn– 40 – – 40 – µV
Ripple Rejection
(–8.0 ≥ VI ≥ –18 Vdc, f = 120 Hz, TJ = +25°C) RR 40 49 – 41 49 – dB
Dropout Voltage (IO = 40 mA, TJ = +25°C) |VI–VO| – 1.7 – – 1.7 – Vdc
ELECTRICAL CHARACTERISTICS (VI = –19 V, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF, –40°C < TJ +125°C (for MC79LXXAC),
0°C < TJ < +125°C (for MC79LXXAB)). MC79L12C, AB MC79L12AC, AB
Characteristics Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = +25°C) VO–11.1 –12 –12.9 –11.5 –12 –12.5 Vdc
Input Regulation
(TJ = +25°C)
–14.5 Vdc ≥ VI ≥ –27 Vdc
–16 Vdc ≥ VI ≥ –27 Vdc
Regline
–
––
–250
200 –
––
–250
200
mV
Load Regulation
TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA
1.0 mA ≤ IO ≤ 40 mA
Regload –
––
–100
50 –
––
–100
50
mV
Output Voltage
–14.5 Vdc ≥ VI ≥ –27 Vdc, 1.0 mA ≤ IO ≤ 40 mA
VI = –19 Vdc, 1.0 mA ≤ IO ≤ 70 mA
VO–10.8
–10.8 –
––13.2
–13.2 –11.4
–11.4 –
––12.6
–12.6
Vdc
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
IIB –
––
–6.5
6.0 –
––
–6.5
6.0
mA
Input Bias Current Change
–16 Vdc ≥ VI ≥ –27 Vdc
1.0 mA ≤ IO ≤ 40 mA
IIB –
––
–1.5
0.2 –
––
–1.5
0.2
mA
Output Noise Voltage
(TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) Vn– 80 – – 80 – µV
Ripple Rejection
(–15 ≤ VI ≤ –25 Vdc, f = 120 Hz, TJ = +25°C) RR 36 42 – 37 42 – dB
Dropout Voltage (IO = 40 mA, TJ = +25°C) |VI–VO| – 1.7 – – 1.7 – Vdc
MC79L00, A Series
3
MOTOROLA ANALOG IC DEVICE DATA
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 MC79L15AC, AB
Characteristics Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = +25°C) VO–13.8 –15 –16.2 –14.4 –15 –15.6 Vdc
Input Regulation
(TJ = +25°C)
–17.5 Vdc ≥ VI ≥ –30 Vdc
–20 Vdc ≥ VI ≥ –30 Vdc
Regline
–
––
–300
250 –
––
–300
250
mV
Load Regulation
TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA
1.0 mA ≤ IO ≤ 40 mA
Regload –
––
–150
75 –
––
–150
75
mV
Output Voltage
–17.5 Vdc ≥ VI ≥ –Vdc, 1.0 mA ≤ IO ≤ 40 mA
VI = –23 Vdc, 1.0 mA ≤ IO ≤ 70 mA
VO–13.5
–13.5 –
––16.5
–16.5 –14.25
–14.25 –
––15.75
–15.75
Vdc
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
IIB –
––
–6.5
6.0 –
––
–6.5
6.0
mA
Input Bias Current Change
–20 Vdc ≥ VI ≥ –30 Vdc
1.0 mA ≤ IO ≤ 40 mA
∆IIB –
––
–1.5
0.2 –
––
–1.5
0.1
mA
Output Noise Voltage
(TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) VN– 90 – – 90 – µV
Ripple Rejection
(–18.5 ≤ VI ≤ –28.5 Vdc, f = 120 Hz) RR 33 39 – 34 39 – dB
Dropout Voltage
IO = 40 mA, TJ = +25°C|VI–VO| – 1.7 – – 1.7 – Vdc
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 MC79L18AC
Characteristics Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = +25°C) VO–16.6 –18 –19.4 –17.3 –18 –18.7 Vdc
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
Regline
–
–
–
–
–
–
–
–
–
325
275
–
–
–
–
–
–
–
–
–
325
–
–
275
mV
Load Regulation
TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA
1.0 mA ≤ IO ≤ 40 mA
Regload –
––
–170
85 –
––
–170
85
mV
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
VO–
–16.2
–16.2
–
–
–
–
–19.8
–19.8
–17.1
–
–17.1
–
–
–
–18.9
–
–18.9
Vdc
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
IIB –
––
–6.5
6.0 –
––
–6.5
6.0
mA
Input Bias Current Change
–21 Vdc ≥ VI ≥ –33 Vdc
–27 Vdc ≥ VI ≥ –33 Vdc
1.0 mA ≤ IO ≤ 40 mA
IIB –
–
–
–
–
–
–
1.5
0.2
–
–
–
–
–
–
1.5
–
0.1
mA
Output Noise Voltage
(TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) Vn– 150 – – 150 – µV
Ripple Rejection
(–23 ≤ VI ≤ –33 Vdc, f = 120 Hz, TJ = +25°C) RR 32 46 – 33 48 – dB
Dropout Voltage
IO = 40 mA, TJ = +25°C|VI–VO| –1.7 – – 1.7 – Vdc
MC79L00, A Series
4MOTOROLA ANALOG IC DEVICE DATA
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 MC79L24AC
Characteristics Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = +25°C) VO–22.1 –24 –25.9 –23 –24 –25 Vdc
Input Regulation
(TJ = +25°C)
–27 Vdc ≥ VI ≥ –38 Vdc
–27.5 Vdc ≥ VI ≥ –38 Vdc
–28 Vdc ≥ VI ≥ –38 Vdc
Regline
–
–
–
–
–
–
–
350
300
–
–
–
–
–
–
350
–
300
mV
Load Regulation
TJ = +25°C, 1.0 mA ≤ IO ≤ 100 mA
1.0 mA ≤ IO ≤ 40 mA
Regload –
––
–200
100 –
––
–200
100
mV
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
VO–
–21.4
–21.4
–
–
–
–
–26.4
–26.4
–22.8
–
–22.8
–
–
–
–25.2
–
–25.2
Vdc
Input Bias Current
(TJ = +25°C)
(TJ = +125°C)
IIB –
––
–6.5
6.0 –
––
–6.5
6.0
mA
Input Bias Current Change
–28 Vdc ≥ VI ≥ –38 Vdc
1.0 mA ≤ IO ≤ 40 mA
∆IIB –
––
–1.5
0.2 –
––
–1.5
0.1
mA
Output Noise Voltage
(TA = +25°C, 10 Hz ≤ f ≤ 100 kHz) Vn– 200 – – 200 – µV
Ripple Rejection
(–29 ≤ VI ≤ –35 Vdc, f = 120 Hz, TJ = +25°C) RR 30 43 – 31 47 – dB
Dropout Voltage
IO = 40 mA, TJ = +25°C|VI–VO| – 1.7 – – 1.7 – Vdc
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 Figure 2. Standard Application
+Vin +VO
0.1
µ
F
–Vin –VO
0.33
µ
F
MC78LXX
MC79LXX
0.1
µ
F
0.33
µ
F
Input Output
CO**
0.1
µ
F
CI*
0.33
µ
F
MC79LXX
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.
MC79L00, A Series
5
MOTOROLA ANALOG IC DEVICE DATA
TYPICAL CHARACTERISTICS
(TA = +25°C, unless otherwise noted.)
IIB, INPUT BIAS CURRENT (mA)
IIB, INPUT BIAS CURRENT (mA) VO, OUTPUT VOLTAGE (V)
Figure 3. Dropout Characteristics Figure 4. Dropout Voltage versus
Junction Temperature
Figure 5. Input Bias Current versus
Ambient Temperature Figure 6. Input Bias Current versus
Input Voltage
Figure 7. Maximum Average Power Dissipation
versus Ambient Temperature (TO–92)
8.0
6.0
4.0
2.0
00 –2.0 –4.0 –6.0 –0.8 –10
Vin, INPUT VOLTAGE (V)
MC79L05C
VO = –5.0 V
TJ = 25
°
C
IO = 1.0 mA IO = 100 mA
IO = 40 mA
–2.5
–2.0
–1.5
–1.0
–0.5
00 25 50 75 100 125
, INPUT/OUTPUT DIFFERENTIAL
VOLTAGE (V)
IO
T
J
, JUNCTION TEMPERATURE (
°
C)
IO = 70 mA
–VV
4.0
4.2
3.8
3.6
3.4
3.2
3.0
00 25 50 75 100 125
TA, AMBIENT TEMPERATURE (
°
C)
MC79L05C
Vin = –10 V
VO = –5.0 V
IO = 40 mA
5.0
4.0
3.0
2.0
1.0
00 –5.0 –10 –15 –20 –25 –30 –35 –40
Vin, INPUT VOLTAGE (V)
MC79L05C
VO = –5.0 V
IO = 40 mA
10,000
1,000
100
10
, POWER DISSIPATION (mW)
D
TA, AMBIENT TEMPERATURE (
°
C)
25 50 75 100 125 150
P
No Heatsink
R
Θ
JA = 200
°
C/W
PD(max) to 25
°
C = 625 mW
Figure 8. SOP–8 Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
30
50
70
90
110
130
150
0.4
0.8
1.2
1.6
2.0
2.4
2.8
02030504010 L, LENGTH OF COPPER (mm)
170 3.2
PD(max) for TA = +50
°
C
R
θ
JA
PD, MAXIMUM POWER DISSIPATION (W)
ÎÎÎ
ÎÎÎ
ÎÎÎ
ÎÎÎ
ÎÎÎ
ÎÎÎ
ÎÎÎ
2.0 oz.
Copper
Graph represents symmetrical layout
3.0 mmL
L
IO = 40 mA
IO = 1.0 mA
JUNCTION–T O–AIR ( C/W)
°
RJA, THERMAL RESISTANCE
θ
Dropout of Regulation is
defined when
∆
VO = 2% of VO
MC79L00, A Series
6MOTOROLA ANALOG IC DEVICE DATA
OUTLINE DIMENSIONS
P SUFFIX
PLASTIC PACKAGE
CASE 29–04
ISSUE AD
D SUFFIX
PLASTIC PACKAGE
CASE 751–05
(SOP–8)
ISSUE R
R
A
P
J
L
F
B
K
G
H
SECTION X–X
C
V
D
N
N
XX
SEATING
PLANE
1
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. CONTOUR OF PACKAGE BEYOND DIMENSION R
IS UNCONTROLLED.
4. DIMENSION F APPLIES BETWEEN P AND L.
DIMENSION D AND J APPLY BETWEEN L AND K
MINIMUM. LEAD DIMENSION IS UNCONTROLLED
IN P AND BEYOND DIMENSION K MINIMUM.
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A0.175 0.205 4.45 5.20
B0.170 0.210 4.32 5.33
C0.125 0.165 3.18 4.19
D0.016 0.022 0.41 0.55
F0.016 0.019 0.41 0.48
G0.045 0.055 1.15 1.39
H0.095 0.105 2.42 2.66
J0.015 0.020 0.39 0.50
K0.500 ––– 12.70 –––
L0.250 ––– 6.35 –––
N0.080 0.105 2.04 2.66
P––– 0.100 ––– 2.54
R0.115 ––– 2.93 –––
V0.135 ––– 3.43 –––
SEATING
PLANE
14
58
A0.25 MCBSS
0.25 MBM
h
q
C
X 45
_
L
DIM MIN MAX
MILLIMETERS
A1.35 1.75
A1 0.10 0.25
B0.35 0.49
C0.18 0.25
D4.80 5.00
E1.27 BSCe3.80 4.00
H5.80 6.20
h
0 7
L0.40 1.25
q
0.25 0.50
__
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.
2. DIMENSIONS ARE IN MILLIMETERS.
3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE MOLD
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.
D
EH
A
Be
B
A1
CA
0.10
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola
was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Af firmative Action Employer .
How to reach us:
USA/EUROPE/Locations Not Listed: Motorola Literature Distribution; JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center ,
P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 or 602–303–5454 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315
MFAX: RMFAX0@email.sps.mot.com – T OUCHTONE 602–244–6609 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
INTERNET: http://Design–NET.com 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298
MC79L00/D
*MC79L00/D*
◊
