Datasheet MC79M12, MC79M08, MC79M05, MC79M15 Datasheet (Fairchild Semiconductor)

www.fairchildsemi.com

MC79MXX

3-Terminal 0.5A Negative V oltage R egulator

Features

• No external components required

• Output current in excess of 0.5A

• Internal thermal overload

• Internal short circuit current limiting

• Output transistor safe area compensation

• Output voltages of -5V,-6V,-8V,-12V,-15V,-18Vand -24V

Schematic Diagram

Description

The MC79MXX series of 3-Terminal medium current
negative voltage regulators are monolithic integrated circuits
designed as fixed voltage regulators. These regulators
employ internal current limiting, thermal shutdown and safe
area compensation making them essentially indestructible.

TO-220

1

1. GND 2. Input 3. Output

©2001 Fairchild Semiconductor Corporation

Rev. 1.0.0

MC79MXX

Absolute Maximum Ratings

Parameter Symbol Value Unit

Input Voltage(for V
(for V

= -24V)

O

Thermal Resistance Junction-Cases R
Thermal Resistance Junction-Air R
Operating Temperature Range T
Storage Temperature Range T

= -5V to -18V)

O

V

I

V

I

θJC
θJA

OPR
STG

-35

-40
5 °C /W

65 °C /W

0 ~ +125 °C

-65 ~ +125 °C

Electrical Characteristics (MC79M05)

(Refer to test circuit, 0

°C ≤TJ ≤ +125

Parameter Symbol Conditions Min. Typ. Max. Unit

Output Voltage V

Line Regulation (Note1) ∆V

Load Regulation (Note1) ∆V
Quiescent Current I

Quiescent Current Change ∆I

Output Voltage Drift ∆Vo/∆TI
Output Noise Voltage V

Ripple Rejection RR
Dropout Voltage V

Short Circuit Current I
Peak Current I

°C, l

=350mA, VI = -10V,unless otherwise specified, CI =0.33µF,CO=0.1µF)

O

TJ= +25 °C -4.8 -5 -5.2

O

O

O

Q

= 5mA to 350mA

I

O

V

= -7V to -25V

I

TJ =+25°C

V
V

IO = 5mA to 500mA
T

= +25 °C

J

= -7V to -25V - 7.0 50

I

= -8V to -25V - 2.0 30

I

-4.75 -5 -5.25

- 30 100 mV

TJ= +25 °C-3.06.0mA
IO = 5mA to 350mA - - 0.4

Q

N

D
SC
PK

= 200mA

I

O

V

= -8V to -25V

I

= 5mA - -0.2 - mV/ °C

O

f = 10Hz, 100KHz
T

= +25 °C

A

f = 120Hz
V

= -8 to -18V

J

--0.4

-40-µV

54 60 - dB

TJ =+25 °C, IO = 500mA - 1.1 - V
TJ= +25 °C, VI = -35V - 140 - mA
TJ= +25 °C - 650 - mA

V
V

V

mV

mA

Note:

1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.

2

Electrical Characteristics (MC79M06)

(Refer to test circuit, 0

Parameter Symbol Conditions Min. Typ. Max. Unit

Output Voltage V

Line Regulation (Note1) ∆V
Load Regulation (Note1) ∆V

Quiescent Current I
Quiescent Current Change ∆I
Output Voltage Drift ∆V

Output Noise Voltage V
Ripple Rejection RR f = 120Hz,V
Dropout Voltage V
Short Circuit Current I
Peak Current I

°C ≤TJ ≤ +125 °C, l

O

O

O

Q

Q

/∆TIO = 5mA - 0.4 - mV/ °C

O

N

D

SC
PK

=350mA, VI = -11V,unless otherwise specified)

O

TJ= +25 °C - 5.75 - 6.0 - 6.25

= 5mA to 350mA

I

O

V

= -8.0V to -25V - 5.7 - 6.0 - 6.3

I

TJ =+25°C
TJ= +25 °CIO = 5.0mA to 500mA - 30 120 mV

TJ= +25 °C-36mA
IO = 5mA to 350mA - - 0.4

= -8V to -25V - - 0.4

V

I

f = 10Hz to 100KHz,TA = +25 °C-50-µV

IO = 500mA, TJ = +25 °C-1.1-V
VI = -35V, TJ = +25 °C - 140 - mA
TJ= +25 °C - 650 - mA

MC79MXX

V

= -8V to -25V - 7.0 60

I

= -9V to -19V - 2.0 40

V

I

= -9V to -19V 54 60 - dB

I

V

mV

mA

Note:

1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.

3

MC79MXX

Electrical Characteristics (MC79M08)

(Refer to test circuit, 0

Parameter Symbol Conditions Min. Typ. Max. Unit

Output Voltage V

Line Regulation (Note1) ∆V
Load Regulation (Note1) ∆V

Quiescent Current I
Quiescent Current Change ∆I
Output Voltage Drift ∆V

Output Noise Voltage V
Ripple Rejection RR f = 120Hz,V
Dropout Voltage V
Short Circuit Current I
Peak Current I

°C ≤TJ ≤ +125 °C, l

Q

O

SC
PK

=350mA, VI = -14V,unless otherwise specified)

O

TJ= +25 °C - 7.7 - 8.0 - 8.3

O

O

O

= 5mA to 350mA

I

O

V

= -10.5V to -25V - 7.6 - 8.0 - 8.4

I

TJ =+25°C
TJ= +25 °CIO = 5.0mA to 500mA - 30 160 mV

TJ= +25 °C-36mA
IO = 5mA to 350mA - - 0.4

Q

= -8V to -25V - - 0.4

V

I

/∆TIO = 5mA - -0.6 - mV/ °C

f = 10Hz to 100KHz,TA = +25 °C-60-µV

N

IO = 500mA, TJ = +25 °C-1.1-V

D

VI = -35V, TJ = +25 °C - 140 - mA
TJ = +25 °C - 650 - mA

V

= -10.5V to -25V - 7.0 80

I

= -11V to -21V - 2.0 50

V

I

mV

mA

= -9V to -19V 54 59 - dB

I

V

Note:

1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.

4

Electrical Characteristics (MC79M12)

(Refer to test circuit, 0

Parameter Symbol Conditions Min. Typ. Max. Unit

Output Voltage V

Line Regulation (Note1) ∆V
Load Regulation (Note1) ∆V

Quiescent Current I
Quiescent Current Change ∆I
Output Voltage Drift ∆V

Output Noise Voltage V
Ripple Rejection RR f = 120Hz,V
Dropout Voltage V
Short Circuit Current I
Peak Current I

°C ≤TJ ≤ +125 °C, l

O

O

O

Q

Q

/∆TIO = 5mA - -0.8 - mV/ °C

O

N

D

SC
PK

=350mA, VI = -19V,unless otherwise specified)

O

TJ= +25 °C -11.5 -12 -12.5

= 5mA to 350mA

I

O

V

= -14.5V to -30V -11.4 -12 -12.6

I

TJ =+25°C
TJ= +25 °CIO = 5.0mA to 500mA - 30 240 mV

TJ= +25 °C-36mA
IO = 5mA to 350mA - - 0.4

= -14.5V to -30V - - 0.4

V

I

f = 10Hz to 100KHz,TA =+25 °C-75-µV

IO = 500mA, TJ = +25 °C-1.1-V
VI = -35V, TJ = +25 °C - 140 - mA
TJ= +25 °C - 650 - mA

MC79MXX

V

= -14.5V to -30V - 8.0 80

I

= -15V to -25V - 3.0 50

V

I

= -15V to -25V 54 60 - dB

I

V

mV

mA

Note:

1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.

5

MC79MXX

Electrical Characteristics (MC79M15)

(Refer to test circuit, 0

Parameter Symbol Conditions Min. Typ. Max. Unit

Output Voltage V

Line Regulation (Note1) ∆V
Load Regulation (Note1) ∆V

Quiescent Current I
Quiescent Current Change ∆I
Output Voltage Drift ∆V

Output Noise Voltage V
Ripple Rejection RR f = 120Hz,V
Dropout Voltage V
Short Circuit Current I
Peak Current I

°C ≤TJ ≤ +125 °C, l

O

O

O

Q

Q

/∆TIO = 5mA - -1.0 - mV/ °C

O

N

D
SC
PK

=350mA, VI = -23V,unless otherwise specified)

O

TJ= +25 °C - 14.4 - 15 - 15.6

= 5mA to 350mA

I

O

V

= -17.5V to -30V

I

TJ =+25°C
TJ= +25 °CIO = 5.0mA to 500mA - 30 240 mV

TJ= +25 °C-36mA
IO = 5mA to 350mA - - 0.4

= -17.5V to -28V - - 0.4

V

I

f = 10Hz to 100KHz,TA = +25 °C-90-µV

IO = 500mA, TJ = +25 °C-1.1-V
VI = -35V, TJ = +25 °C - 140 - mA
TJ= +25 °C - 650 - mA

-14.25 - 15 -15.75

V

= -17.5V to -30V - 9.0 80

I

= -18V to -28V - 5.0 50

V

I

mV

mA

= -18.5V to -28.5V 54 59 - dB

I

V

Note:

1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.

6

Electrical Characteristics (MC79M18)

(Refer to test circuit, 0

Parameter Symbol Conditions Min. Typ. Max. Unit

Output Voltage V

Line Regulation (Note1) ∆V
Load Regulation (Note1) ∆V

Quiescent Current I
Quiescent Current Change ∆I
Output Voltage Drift ∆V

Output Noise Voltage V
Ripple Rejection RR f = 120Hz,V
Dropout Voltage V
Short Circuit Current I
Peak Current I

°C ≤TJ ≤ +125 °C, l

O

O

O

Q

Q

/∆TIO = 5mA - -1.0 - mV/ °C

O

N

D
SC
PK

=350mA, VI = -27V,unless otherwise specified)

O

TJ= +25 °C - 17.3 - 18 - 18.7

= 5mA to 350mA

I

O

V

= -21V to -33V

I

TJ =+25°C
TJ= +25 °CIO = 5.0mA to 500mA - 30 360 mV

TJ= +25 °C-36mA
IO = 5mA to 350mA - - 0.4

= -21V to -33V - - 0.4

V

I

f = 10Hz to 100KHz,TA = +25 °C-110-µV

IO = 500mA, TJ = +25 °C-1.1-V
VI = -35V, TJ = +25 °C - 140 - mA
TJ= +25 °C - 650 - mA

MC79MXX

- 17.1 - 18 - 18.9

V

= -21V to -33V - 9.0 80

I

= -24V to -30V - 5.0 80

V

I

mV

mA

= -22V to -32V 54 59 - dB

I

V

Note;

1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.

7

MC79MXX

Electrical Characteristics (MC79M24)

(Refer to test circuit, 0

Parameter Symbol Conditions Min. Typ. Max. Unit

Output Voltage V

Line Regulation (Note1) ∆V
Load Regulation (Note1) ∆V

Quiescent Current I
Quiescent Current Change ∆I
Output Voltage Drift ∆V

Output Noise Voltage V
Ripple Rejection RR f = 120Hz,V
Dropout Voltage V
Short Circuit Current I
Peak Current I

°C ≤TJ ≤ +125 °C, l

Q

O

SC
PK

=350mA, VI = -33V,unless otherwise specified)

O

TJ= +25 °C - 23 - 24 - 25

O

O

O

= 5mA to 350mA

I

O

V

= -27V to -38V

I

TJ =+25°C
TJ= +25 °CIO = 5.0mA to 500mA - 30 300 mV

TJ= +25 °C-36mA
IO = 5mA to 350mA - - 0.4

Q

= -27V to -38V - - 0.4

V

I

/∆TIO = 5mA - -1.0 - mV/ °C

f = 10Hz to 100KHz,TA = +25 °C - 180 - µV

N

IO = 500mA, TJ = +25 °C-1.1-V

D

VI = -35V, TJ = +25 °C - 140 - mA
TJ= +25 °C - 650 - mA

- 22.8 - 24 - 25.2

V

= -27V to -38V - 9.0 80

I

= -30V to -36V - 5.0 70

V

I

mV

mA

= -28V to -38V 54 58 - dB

I

V

Note:

1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken
into account separately. Pulse testing with low duty is used.

8

Typical Applications

MC79MXX

MC79MXX

Figure 1. Fixed Output Regulator

MC79MXX

Figure 2. Variable Output

Notes:

1. Required for stability. For value given, capacitor must be solid tantalum. 25µF aluminum electrolytic may be substituted.

2. C

improves tr ansient response and ripple rejection. Do not increase beyond 50 µF.

2

9

MC79MXX

Mechanical Dimensions

Package

Dimensions in millimeters

(1.70)

±0.20

9.20

±0.20

13.08

±0.10

1.30

(1.46)

(1.00)

1.27

±0.10

9.90
(8.70)

ø3.60

±0.20

±0.10

(45°)

1.52

±0.10

TO-220

±0.10

2.80

(3.70)(3.00)

±0.20

18.95MAX.

15.90

±0.30

10.08

4.50

±0.20

+0.10

1.30

–0.05

10

2.54TYP

[2.54

±0.20

]

10.00

±0.20

0.80

±0.10

2.54TYP

[2.54

±0.20

+0.10

0.50

–0.05

2.40

±0.20

]

MC79MXX

Mechanical Dimensions

Package

6.60

±0.20

5.34

±0.30

(4.34)(0.50) (0.50)

±0.20

0.60

±0.20

0.80

MAX0.96

2.30TYP

[2.30±0.20]

(Continued)

D-PAK

±0.20

2.70

0.76

2.30TYP

[2.30±0.20]

±0.10

±0.20

0.70

±0.20

6.10

±0.30

9.50

Dimensions in millimeters

2.30

±0.10

0.50

±0.10

±0.10

0.91
MIN0.55

±0.10

0.50

0.89

1.02

2.30

±0.10

±0.20
±0.20

±0.30

9.50

±0.20

6.10

±0.20

2.70

6.60

±0.20

(5.34)

(5.04)
(1.50)

(2XR0.25)

(0.70)

0.76

(0.90)

(0.10) (3.05)

±0.10

(1.00)

11

MC79MXX

Ordering Information

Product Number Package Operating Temperature

MC79M05CT
MC79M06CT
MC79M08CT
MC79M12CT
MC79M15CT
MC79M18CT
MC79M24CT

TO-220 0 ~ + 125°C

12

MC79MXX

13

MC79MXX

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURT HER NOTICE TO ANY
PRODUCTS HEREI N TO IMPROVE RELIABILITY, FUNCTIO N OR DESIGN. FAIRCH IL D DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER IT S PATENT RIGHTS, NOR THE RIGHTS OF OTHE RS.

LIFE SUPPORT POL I CY

FAIRCHILD’S PR ODUCTS ARE NOT AUTH ORIZED FOR USE AS C RITICAL COMPONENT S IN LIFE SUPPORT DE VICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein :

1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with

2. A critical component in any component of a life support
device or sy stem whose fai lure to perform can be
reasonably expec ted to cause the failur e of the life support
device or system, or to affect its safety or effec t iv ene ss .

instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.

www.fairchildsemi.com

6/11/01 0.0m 001

 2001 Fairchild Semiconductor Corporation

Stock#DSxxxxxxxx