Rev. 1.0.1
Features
•Output Current in Excess of 1A
•Output V oltages of -5, -6, -8 , -9, -10, -12, -15, -18 and -24V
•Internal Thermal Overload Protection •Short Circuit Protection
•Output Transistor Safe Operating Area Compensation
Description
The MC79XX / MC79XXA/ LM79XX series of three
terminal negative regulators are available in TO-220package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut down and safe operating area protection, making it essentially indestructible.
TO-220
1. GND
2. Input
3. Output
1
Vin
MC79XX/MC79XXA/LM79XX
3-Terminal 1A Negative Voltage Regulator
MC79XX/MC79XXA/LM79XX
Absolute Maximum Ratings
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm(1S0P)JEDEC standard: JESD51-3, JESD51-72. Assume no ambient airflow
Electrical Characteristics (MC7905/LM7905)
(V I = -10V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)Note
3. 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.
Parameter Symbol Value Unit Input Voltage
V I -35V Thermal Resistance Junction-Case (Note1)R θJC 5°C/W Thermal Resistance Junction-Air (Note1, 2)R θJA 65Operating Temperature Range T OPR 0 ~ +125°C Storage Temperature Range
T STG
-65 ~ +150
°C
Parameter Symbol
Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-4.8-5.0-5.2V I O = 5mA to 1A, P O ≤ 15W V I = -7V to -20V -4.75-5.0-5.25Line Regulation (Note3)∆V O T J = +25°C V I = -7V to -25V -35100mV
V I = -8V to -12V -850Load Regulation (Note3)∆V O T J = +25°C
I O = 5mA to 1.5A -10100
mV
T J =+25°C
I O = 250mA to 750mA -350Quiescent Current I Q T J =+25°C -36mA Quiescent Current Change ∆I Q I O = 5mA to 1A -0.050.5mA V I = -8V to -25V -0.10.8Temperature Coefficient of V D ∆Vo/∆T I O = 5mA
-- 0.4-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz T A =+25°C -40-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J =+25°C, V I = -35V -300-mA Peak Current
I PK
T J =+25°C
- 2.2
-A
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7906) (Continued)
(V I = -11V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)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.
Parameter Symbol
Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-5.75-6-6.25V I O = 5mA to 1A, P O ≤ 15W V I = -9V to -21V -5.7-6-6.3Line Regulation (Note1)∆V O T J = +25°C V I = -8V to -25V -10120mV
V I = -9V to -13V -560Load Regulation (Note1)∆V O T J = +25°C
I O = 5mA to 1.5A -10120
mV
T J =+25°C
I O = 250mA to 750mA -360Quiescent Current I Q T J =+25°C -36mA Quiescent Current Change ∆I Q I O = 5mA to 1A -0.050.5mA V I = -8V to -25V -0.1 1.3Temperature Coefficient of V D ∆Vo/∆T I O = 5mA
--0.5-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz T A =+25°C -130-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J = +25°C, V I = -35V -300-mA Peak Current
I PK
T J = +25°C
- 2.2
-A
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7908) (Continued)
(V I = -14V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)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.
Parameter Symbol Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-7.7-8-8.3V I O = 5mA to 1A, P O ≤ 15W V I = -10V to -23V -7.6-8-8.4Line Regulation (Note1)∆V O T J = +25°C
V I = -10.5V to -25V -10160mV
V I = -11V to -17V
-580Load Regulation (Note1)∆V O T J = +25°C
I O = 5mA to 1.5A -12160
mV
T J =+25°C
I O = 250mA to 750mA -480Quiescent Current I Q T J =+25°C -36mA Quiescent Current Change ∆I Q I O = 5mA to 1A -0.050.5mA V I = -10.5V to -25V -0.11Temperature Coefficient of V D ∆Vo/∆T I O = 5mA
--0.6-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz T A =+25°C -175-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J = +25°C, V I = -35V -300-mA Peak Current
I PK
T J = +25°C
- 2.2
-A
(V I = -15V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)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.
Parameter Symbol
Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-8.7-9.0-9.3V I O = 5mA to 1A, P O ≤ 15W V I = -1.5V to -23V -8.6-9.0-9.4Line Regulation (Note1)∆V O T J = +25°C V I = -11.5V to -26V -10180mV
V I = -12V to -18V -590Load Regulation (Note1)∆V O T J = +25°C
I O = 5mA to 1.5A -12180
mV
T J = +25°C
I O = 250mA to 750mA -490Quiescent Current I Q T J = +25°C -36mA Quiescent Current Change ∆I Q I O = 5mA to 1A -0.050.5mA V I = -11.5V to -26V -0.11Temperature Coefficient of V D ∆Vo/∆T I O = 5mA
--0.6-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz T A = +25°C -175-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J = +25°C, V I = -35V -300-mA Peak Current
I PK
T J = +25°C
- 2.2
-A
(V I = -17V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)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.
Parameter Symbol
Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-9.6-10-10.4V I O = 5mA to 1A, P d ≤ 15W V I = -12V to -28 -9.5-10-10.5Line Regulation (Note1)∆V O T J = +25°C V I = -12.5V to -28V -12200mV
V I = -14V to -20V -6100Load Regulation (Note1)∆V O T J = +25°C
I O = 5mA to 1.5A -12200
mV
T J = +25°C
I O = 250mA to 750mA -4100Quiescent Current I Q T J = +25°C -36mA Quiescent Current Change ∆I Q I O = 5mA to 1A -0.050.5mA V I = -12.5V to -28V -0.11Temperature Coefficient of V O ∆Vo/∆T I O = 5mA --1-mV/°C Output Noise Voltage V N 10Hz ≤ f ≤ 100kHz T A =+25°C -280-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J = +25°C, V I = -35V -300-mA Peak Current
I PK
T J = +25°C
- 2.2
-A
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7912) (Continued)
(V I = -19V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)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.
Parameter Symbol
Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-11.5-12-12.5V I O = 5mA to 1A, P O ≤ 15W V I = -15.5V to -27V -11.4-12-12.6Line Regulation (Note1)∆V O T J = +25°C V I = -14.5V to -30V -12240mV
V I = -16V to -22V -6120Load Regulation (Note1)∆V O T J = +25°C
I O = 5mA to 1.5A -12240
mV
T J = +25°C
I O = 250mA to 750mA -4120Quiescent Current I Q T J = +25°C -36mA Quiescent Current Change ∆I Q I O = 5mA to 1A -0.050.5mA V I = -14.5V to -30V -0.11Temperature Coefficient of V D ∆Vo/∆T I O = 5mA
--0.8-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz T A = +25°C -200-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J = +25°C, V I = -35V -300-mA Peak Current
I PK
T J = +25°C
- 2.2
-A
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7915) (Continued)
(V I = -23V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)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.
Parameter Symbol
Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-14.4-15-15.6V I O = 5mA to 1A, P O ≤ 15W V I = -18V to -30V -14.25-15-15.75Line Regulation (Note1)∆V O T J = +25°C V I = -17.5V to -30V -12300mV
V I = -20V to -26V -6150Load Regulation (Note1)∆V O T J = +25°C
I O = 5mA to 1.5A -12300
mV
T J = +25°C
I O = 250mA to 750mA -4150Quiescent Current I Q T J = +25°C -36mA Quiescent Current Change ∆I Q I O = 5mA to 1A -0.050.5mA V I = -17.5V to -30V -0.11Temperature Coefficient of V D ∆Vo/∆T I O = 5mA
--0.9-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz T A =+25°C -250-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J = +25°C, V I = -35V -300-mA Peak Current
I PK
T J = +25°C
- 2.2
-A
(V I = -27V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)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.
Parameter Symbol
Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-17.3-18-18.7V I O = 5mA to 1A, P O ≤ 15W V I = -22.5V to -33V -17.1-18-18.9Line Regulation (Note1)∆V O T J = +25°C V I = -21V to -33V -15360mV
V I = -24V to -30V -8180Load Regulation (Note1)∆V O T J = +25°C
I O = 5mA to 1.5A -15360
mV
T J = +25°C
I O = 250mA to 750mA -5180Quiescent Current I Q T J = +25°C -36mA Quiescent Current Change ∆I Q I O = 5mA to 1A -0.050.5mA V I = -21V to -33V -0.11Temperature Coefficient of V D ∆Vo/∆T I O = 5mA
--1-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz T A = +25°C -300-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J = +25°C, V I = -35V -300-mA Peak Current
I PK
T J = +25°C
- 2.2
-A
(V I = -33V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)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.
Parameter Symbol
Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-23-24-25V I O = 5mA to 1A, P O ≤ 15W V I = -27V to -38V -22.8-24-25.2Line Regulation (Note1)∆V O T J = +25°C V I = -27V to -38V -15480mV
V I = -30V to -36V -8180Load Regulation (Note1)∆V O T J = +25°C
I O = 5mA to 1.5A -15480
mV
T J = +25°C
I O = 250mA to 750mA -5240Quiescent Current I Q T J = +25°C -36mA Quiescent Current Change ∆I Q I O = 5mA to 1A -0.050.5mA V I = -27V to -38V -0.11Temperature Coefficient of V D ∆Vo/∆T I O = 5mA
--1-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz T A = +25°C -400-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J = +25°C, V I = -35V -300-mA Peak Current
I PK
T J = +25°C
- 2.2
-A
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7905A) (Continued)
(V I = -10V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)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.
Parameter Symbol
Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-4.9-5.0-5.1V I O = 5mA to 1A, P O ≤ 15W V I = -7V to -20V - 4.8-5.0-5.2Line Regulation (Note1)
∆V O
T J = +25°C
V I = -7V to -20V I O =1A -550mV V I = -8V to -12V I O =1A -225V I = -7.5V to -25V -750V I = -8V to -12V , I O =1A -750Load Regulation (Note1)∆V O T J =+25°C, I O = 5mA to 1.5A
-10100mV T J = +25°C
I O = 250mA to 750mA -350Quiescent Current I Q T J = +25°C -36mA Quiescent Current Change ∆I Q I O = 5mA to 1A -0.050.5mA V I = -8V to -25V -0.10.8Temperature Coefficient of V D
∆Vo/∆T I O = 5mA
-- 0.4-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz T A = +25°C -40-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J = +25°C, V I = -35V -300-mA Peak Current
I PK
T J = +25°C
- 2.2
-A
MC79XX/MC79XXA/LM79XX
Electrical Characteristics (MC7912A) (Continued)
(V I = -19V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)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.
Parameter Symbol
Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-11.75-12-12.25V I O = 5mA to 1A, P O ≤ 15W V I = -15.5V to -27V -11.5-12-12.5Line Regulation (Note1)
∆V O
T J = +25°C
V I = -14.5V to -27V Io = 1A
-12120mV V I = -16V to -22V Io = 1A -660V I = -14.8V to -30V -12120V I = -16V to -22V, Io = 1A
-12120Load Regulation (Note1)
∆V O T J = +25°C
I O = 5mA to 1.5A -12150
mV
T J = +25°C
I O = 250mA to 750mA -475Quiescent Current I Q T J = +25°C -36mA Quiescent Current Change ∆I Q I O = 5mA to 1A -0.050.5mA V I = -15V to -30V -0.11Temperature Coefficient of V D ∆Vo/∆T I O = 5mA
--0.8-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz T A = +25°C -200-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J = +25°C, V I = -35V -300-mA Peak Current
I PK
T J = +25°C
- 2.2
-A
13
Electrical Characteristics (MC7915A) (Continued)
(V I = -23V, I O = 500mA, 0°C ≤T J ≤ +125°C, C I =2.2µF, C O =1µF, unless otherwise specified.)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.
Parameter Symbol
Conditions
Min.Typ.Max.Unit
Output Voltage
V O
T J = +25°C
-14.7-15-15.3V I O = 5mA to 1A, P O ≤ 15W V I = -18V to -30V -14.4-15-15.6Line Regulation (Note1)
∆V O
T J = +25°C
V I = -17.5V to -30V Io = 1A
-12150mV V I = -20V to -26V Io = 1A -675V I = -17.9V to -30V -12150V I = -20V to -26V, Io = 1A
-6150Load Regulation (Note1)
∆V O T J = +25°C
I O = 5mA to 1.5A -12150
mV
T J = +25°C
I O = 250mA to 750mA -475Quiescent Current I Q T J = +25°C -36mA Quiescent Current Change
∆I Q
I O = 5mA to 1A -0.050.5mA V I = -18.5V to -30V -0.11Temperature Coefficient of V D ∆Vo/∆T I O = 5mA
--0.9-mV/°C Output Noise Voltage V N f = 10Hz to 100kHz T A = +25°C -250-µV Ripple Rejection RR f = 120Hz ∆V I = 10V 5460-dB Dropout Voltage V D T J = +25°C I O = 1A
-2-V Short Circuit Current I SC T J = +25°C, V I = -35V -300-mA Peak Current
I PK
T J = +25°C
- 2.2
-A
14
Typical Perfomance Characteristics
Figure 1.Output Voltage Figure 3.Quiescent Current Figure 5.Short Circuit Current
Figure 2.Load Regulation
Figure 4.Dropout Voltage
Figure 6.Negative Fixed output regulator
Figure 7.Split power supply (±12V/1A)
Notes:
(1)To specify an output voltage, substitute voltage value for "XX "
(2)Required for stability. For value given, capacitor must be solid tantalum. If aluminium electronics are used, at least ten times
value shown should be selected. C I is required if regulator is located an appreciable distance from power supply filter. (3)To improve transient response. If large capacitors are used, a high current diode from input to output (1N400l or similar)
should be introduced to protect the device from momentary input short circuit.
15Mechanical Dimensions
Package
Dimensions in millimeters
TO-220
16
17
Ordering Information
Product Number Output Voltage Tolerance
Package Operating Temperature
LM7905CT ±4%
TO-2200 ~ +125°C Product Number Output Voltage Tolerance
Package
Operating Temperature
MC7905CT ±4%
TO-220
0 ~ +125°C
MC7906CT MC7908CT MC7909CT MC7910CT MC7912CT MC7915CT MC7918CT MC7924CT MC7905ACT ±2%MC7912ACT MC7915ACT
11/12/02 0.0m 001Stock#DSxxxxxxxx
2002 Fairchild Semiconductor Corporation
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