Description
The MC79L00 series of negative voltage regulators are
designed to provide a range of regulated power supply
voltages for low current applications of up to 100mA.
They are low cost, rugged, easy to use, three terminal
devices with inter nal current limiting and thermal shut-
down protection and are the low current members of the
popular MC79M00 and MC7900 family.
No exter nal components are required with the MC79L00
in most applications.
These products offer an improved replacement for the
traditional zener-resistor combination, providing better
output impedance, lower internal power dissipation and
lower quiescent current.
Mechanical Data
Case: TO-92
High temperature soldering guaranteed:
260°C/10 seconds at terminals
Case outlines are on the back pages
Features
• Wide selection of available fixed output voltages
• Low cost
• Internal short circuit current limiting
• Internal ther mal overload protection
• No exter nal components required
• Complementary positive voltage regulators also available
(MC78L00)
• Accurate, ± 2% output voltage tolerance
TO-92
LP Suffix
123
Output
Input
Cin
0.33µF
MC79L00
Co
0.1µF
Standard Application Circuit
Internal Block Diagram
MC79L00
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Document Number 74825 www.vishay.com
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New Product
Three-Terminal Low Current
Negative Voltage Regulators
Input
Output
R1
R2
RSC
GND
Reference
Voltage
Short Circuit
Protection
+
-- Q1 Q2
I1 I2
Ordering Information
MC79Lxx xx xx
Package Code
TO-92: LP
Temperature Range
AB: –40°C to +125°C
AC: 0°C to +125°C
Output Voltage
05: –5V 18: –18V
12: –12V 24: –24V
15: –15V
1
2
3
Top View
1. Gnd
2. VIN
3. VOUT
TO-92
MC79L00
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for merly General Semiconductor
www.vishay.com Document Number 74825
218-Dec-02
MC79L05 AB/AC Electrical Characteristics
Vi = –10V, IO= 40mA, Ci = 0.33µF, CO= 0.1µF, –40°C < TJ< 125°C (MC79L05AB), 0°C < TJ< 125°C (MC79L05AC) unless otherwise noted.
Parameter Symbol Min Typ Max Unit
Output Voltage (TJ= 25°C) VO–4.9 –5.0 –5.1 Vdc
Line Regulation –7.0V ≤Vi ≤–20V REGline 32 150 mV
(TJ= 25°C, I O= 40mA) –8.0V ≤Vi ≤–20V 26 100
Load Regulation 1.0mA ≤IO≤100mA REGload 15 60 mV
(TJ= 25°C) 1.0mA ≤IO≤40mA 8 30
Output Voltage –7.0V ≤Vi ≤–20V, 1.0mA ≤IO≤40mA VO–4.8 (4.75)* –5.2 (5.25)* V
Vi = –10V, 1.0mA ≤IO≤70mA –4.8 (4.75)* –5.2 (5.25)*
Quiescent Current TJ= 25°CIQ3.8 6.0 mA
TJ= 125°C 5.5
Quiescent Current Change –8.0V ≤Vi ≤–20V ∆IQ1.5 mA
1.0mA ≤IO≤40mA 0.1
Output Noise Voltage (TA= 25°C, 10Hz ≤f ≤100KHz) Vn 40 µV
Ripple Rejection RR 40 dB
(IO= 40mA, f = 120HZ, –8.0V ≤Vi ≤–18V, TJ= 25°C)
Dropout Voltage Vdrop 1.7 Vdc
* Limits in parenthesis apply for MC79L05AB
Maximum RatingsTA= 25°C unless otherwise noted.
Parameter Symbol Value Unit
Input Voltage Vi(1) –30 V
Input Voltage Vi(2) –40 V
Storage Junction Temperature Range Tstg –65 to +150 °C
Operating Junction Temperature Range AB Tj–40 to +150 °C
AC 0 to +150
Thermal Resistance, Junction to Ambient TO-92 RθJA 115 °C/W
Notes: (1) MC79L05 to MC79L18
(2) MC79L24
• To maintain the specified junction temperature, low duty cycle pulse testing is required for most parameters. All characteristics are measured with a 0.33µF
capacitor across the input and a 0.1µF capacitor across the output.
MC79L00
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MC79L12 AB/AC Electrical Characteristics
Vi = –19V, IO= 40mA, Ci = 0.33µF, CO= 0.1µF, –40°C < TJ< 125°C (MC79L08AB), 0°C < TJ< 125°C (MC78L09AC) unless otherwise noted.
Parameter Symbol Min Typ Max Unit
Output Voltage (TJ= 25°C) –VO–11.75 –12 –12.25 Vdc
Line Regulation –14.5V ≤Vi ≤–27V REGline 55 250 mV
(TJ= 25°C, I O= 40mA) –16V ≤Vi ≤–27V 49 200
Load Regulation 1.0mA ≤IO≤100mA REGload 22 100 mV
(TJ= 25°C) 1.0mA ≤IO≤40mA 13 50
Output Voltage –14.5V ≤Vi ≤–27V, 1.0mA ≤IO≤40mA VO–11.5 (11.4)* –12.5 (12.6)* V
Vi = –19V, 1.0mA ≤IO≤70mA –11.5 (11.4)* –12.5 (12.6)*
Quiescent Current TJ= 25°CIQ42 6.5 mA
TJ= 125°C 6.0
Quiescent Current Change –16V ≤Vi ≤–27V ∆IQ1.5 mA
1.0mA ≤IO≤40mA 0.2
Output Noise Voltage (TA= 25°C, 10Hz ≤f ≤100KHz) Vn 70 µV
Ripple Rejection RR 36 42 dB
(IO= 40mA, f = 120HZ, –15V ≤Vi ≤–25V, TJ= 25°C)
Dropout Voltage (TJ= 25°C) Vdrop 1.7 Vdc
* Limits in parenthesis apply for MC79L12AB
MC79L15 AB/AC Electrical Characteristics
Vi = –23V, IO= 40mA, Ci = 0.33µF, CO= 0.1µF, –40°C < TJ< 125°C (MC79L09AB), 0°C < TJ< 125°C (MC79L09AC) unless otherwise noted.
Parameter Symbol Min Typ Max Unit
Output Voltage (TJ= 25°C) VO–14.7 –15 –15.3 Vdc
Line Regulation –17.5V ≤Vi ≤–30V REGline 65 300 mV
(TJ= 25°C, I O= 40mA) –20V ≤Vi ≤–30V 58 250
Load Regulation 1.0mA ≤IO≤100mA REGload 25 150 mV
(TJ= 25°C) 1.0mA ≤IO≤40mA 12 75
Output Voltage –17.5V ≤Vi ≤–30V, 1.0mA ≤IO≤40mA VO–14.40 (14.25)* –15.60 (15.75)* Vdc
Vi = –23V, 1.0mA ≤IO≤70mA –14.40 (14.25)* –15.60 (15.75)*
Quiescent Current TJ= 25°CIQ4.4 6.5 mA
TJ= 125°C 6.0
Quiescent Current Change –20V ≤Vi ≤–30V ∆IQ1.5 mA
1.0mA ≤IO≤40mA 0.2
Output Noise Voltage (TA= 25°C, 10Hz ≤f ≤100KHz) Vn 82 µV
Ripple Rejection RR 33 39 dB
(IO= 40mA, f = 120HZ, –18.5V ≤Vi ≤–28.5V, TJ= 25°C)
Dropout Voltage Vdrop 1.7 Vdc
* Limits in parenthesis apply for MC79L15AB
MC79L00
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for merly General Semiconductor
MC79L18 AC Electrical Characteristics
Vi = –27V, IO= 40mA, Ci = 0.33µF, CO= 0.1µF, 0°C < TJ< 125°C unless otherwise noted.
Parameter Symbol Min Typ Max Unit
Output Voltage (TJ= 25°C) VO–17.64 –18 –18.36 Vdc
Line Regulation –20.7V ≤Vi ≤–33V REGline 70 325 mV
(TJ= 25°C, I O= 40mA) –22V ≤Vi ≤–33V 64 275
Load Regulation 1.0mA ≤IO≤100mA REGload 30 170 mV
(TJ= 25°C) 1.0mA ≤IO≤40mA 15 85
Output Voltage –20.7V ≤Vi ≤–33V, 1.0mA ≤IO≤40mA VO–17.4 –18.6 V
Vi = –27V, 1.0mA ≤IO≤70mA –17.4 –18.6
Quiescent Current TJ= 25°CIQ3.1 6.5 mA
TJ= 125°C 6.0
Quiescent Current Change –22V ≤Vi ≤–33V ∆IQ1.5 mA
1.0mA ≤IO≤40mA 0.2
Output Noise Voltage (TA= 25°C, 10Hz ≤f ≤100KHz) Vn 150 µV
Ripple Rejection RR 32 46 dB
(IO= 40mA, f = 120HZ, –23V ≤Vi ≤–33V, TJ= 25°C)
Dropout Voltage (TJ= 25°C) Vdrop 1.7 Vdc
MC79L24 AC Electrical Characteristics
Vi = –33V, IO= 40mA, Ci = 0.33µF, CO= 0.1µF, 0°C < TJ< 125°C unless otherwise noted.
Parameter Symbol Min Typ Max Unit
Output Voltage (TJ= 25°C) VO–23.5 –24 –24.5 Vdc
Line Regulation –27.0V ≤Vi ≤–38V REGline 35 350 mV
(TJ= 25°C, I O= 40mA) –28V ≤Vi ≤–38V 30 300
Load Regulation 1.0mA ≤IO≤100mA REGload 40 200 mV
(TJ= 25°C) 1.0mA ≤IO≤40mA 20 100
Output Voltage –27V ≤Vi ≤–38V, 1.0mA ≤IO≤40mA VO–23.3 –24.7 Vdc
Vi = –33V, 1.0mA ≤IO≤70mA –23.3 –24.7
Quiescent Current TJ= 25°CIQ3.1 6.5 mA
TJ= 125°C 6.0
Quiescent Current Change –28V ≤Vi ≤–38V ∆IQ1.5 mA
1.0mA ≤IO≤40mA 0.2
Output Noise Voltage (TA= 25°C, 10Hz ≤f ≤100KHz) Vn 200 µV
Ripple Rejection RR 30 43 dB
(IO= 40mA, f = 120HZ, –29V ≤Vi ≤–35V, TJ= 25°C)
Dropout Voltage Vdrop 1.7 Vdc
MC79L00
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Ratings and
Characteristic Curves(TA= 25°C unless otherwise noted)
00
Fig. 1 – Dropout Characteristics
VO, Output Voltage (V)
VI, Input Voltage (V)
00
Fig. 4 – Input Bias Current
vs. Input Voltage
IIB, Input Bias Current (mA)
VI, Input Voltage (V)
00
Fig. 2 – Dropout Voltage
vs. Junction Temperature
VI-VO, Input/Output Differential Voltage (V)
TJ, Junction Temperature (°C)
PD, Power Dissipation (mW)
TA, Ambient Temperature (°C)
Fig. 5 – Max. A vera ge P o wer Dissipation
vs. Ambient Temperature – TO-92
00
IIB, Input Bias Current (mA)
TA, Ambient Temperature (°C)
Fig. 3 – Input Bias Current
vs. Ambient Temperature
--2.0
--8.0
--6.0
--4.0
--2.0 --0.5
--1.0
--1.5
--2.0
--2.5
--1.0
--2.0
--3.0
--4.0
--5.0
--4.0 --6.0 --8.0 --10 25 50 75 100 125
--5.0 --10 --15 --20 --25 --30 --35 --40
25 50 75 100 125
--3.0
10,000
1000
100
10
--3.2
--3.4
--3.6
--3.8
--4.0
--4.2
25 50 75 100 125 150
MC79L05
Vout = 5.0V
TJ = 25°C
IO = 1.0mA
IO = 40mA
IO = 100mA
IO = 70mA
IO = 40mA IO = 1.0mA
Dropout of Regulation
is defined as when
VO = 2% of VO
MC79L05
VI = 10V
VO = 5.0V
IO = 40mA
RθJA = 115°C/W
PD(max) to 25°C = 625mW
MC79L05
Vout = 5.0V
IO = 40mA
TJ = 25°C
No Heatsink
MC79L00
Vishay
for merly General Semiconductor
Case Outline – TO-92
Dimensions
in millimeters
4.5
±
0.2
3.5
±
0.2
14.3 (Typ.)
0.46
±
0.025
4.5
±
0.2
2.54
±
0.12
0.4
±
0.025
0.25
±
0.31
MC79L00
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