Fairchild Semiconductor MC79M24 Datasheet

©2001 Fairchild Semiconductor Corporation

www.fairchildsemi.com

Rev. 1.0.0

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

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. GND 2. Input 3. Output

1

Schematic Diagram

MC79MXX

3-Terminal 0.5A Negative Voltage Regulator

MC79MXX

2

Absolute Maximum Ratings

Electrical Characteristics (MC79M05)

(Refer to test circuit, 0

°C ≤TJ ≤ +125

°C, l

O

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

Note:

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

Parameter Symbol Value Unit

Input Voltage(for V

O

= -5V to -18V)

(for V

O

= -24V)

V

I

V

I

-35

-40

V
V

Thermal Resistance Junction-Cases R

θJC

5 °C /W

Thermal Resistance Junction-Air R

θJA

65 °C /W

Operating Temperature Range T

OPR

0 ~ +125 °C

Storage Temperature Range T

STG

-65 ~ +125 °C

Parameter Symbol Conditions Min. Typ. Max. Unit

Output Voltage V

O

TJ= +25 °C -4.8 -5 -5.2

V

I

O

= 5mA to 350mA

V

I

= -7V to -25V

-4.75 -5 -5.25

Line Regulation (Note1) ∆V

O

TJ =+25°C

V

I

= -7V to -25V - 7.0 50

mV

V

I

= -8V to -25V - 2.0 30

Load Regulation (Note1) ∆V

O

IO = 5mA to 500mA
T

J

= +25 °C

- 30 100 mV

Quiescent Current I

Q

TJ= +25 °C-3.06.0mA

Quiescent Current Change ∆I

Q

IO = 5mA to 350mA - - 0.4

mA

I

O

= 200mA

V

I

= -8V to -25V

--0.4

Output Voltage Drift ∆Vo/∆TI

O

= 5mA - -0.2 - mV/ °C

Output Noise Voltage V

N

f = 10Hz, 100KHz
T

A

= +25 °C

-40-µV

Ripple Rejection RR

f = 120Hz
V

J

= -8 to -18V

54 60 - dB

Dropout Voltage V

D

TJ =+25 °C, IO = 500mA - 1.1 - V

Short Circuit Current I

SC

TJ= +25 °C, VI = -35V - 140 - mA

Peak Current I

PK

TJ= +25 °C - 650 - mA

MC79MXX

3

Electrical Characteristics (MC79M06)

(Refer to test circuit, 0

°C ≤TJ ≤ +125 °C, l

O

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

Note:

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

Parameter Symbol Conditions Min. Typ. Max. Unit

Output Voltage V

O

TJ= +25 °C - 5.75 - 6.0 - 6.25

V

I

O

= 5mA to 350mA

V

I

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

Line Regulation (Note1) ∆V

O

TJ =+25°C

V

I

= -8V to -25V - 7.0 60

mV

V

I

= -9V to -19V - 2.0 40

Load Regulation (Note1) ∆V

O

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

Quiescent Current I

Q

TJ= +25 °C-36mA

Quiescent Current Change ∆I

Q

IO = 5mA to 350mA - - 0.4

mA

V

I

= -8V to -25V - - 0.4

Output Voltage Drift ∆V

O

/∆TIO = 5mA - 0.4 - mV/ °C

Output Noise Voltage V

N

f = 10Hz to 100KHz,TA = +25 °C-50-µV

Ripple Rejection RR f = 120Hz,V

I

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

Dropout Voltage V

D

IO = 500mA, TJ = +25 °C-1.1-V

Short Circuit Current I

SC

VI = -35V, TJ = +25 °C - 140 - mA

Peak Current I

PK

TJ= +25 °C - 650 - mA

MC79MXX

4

Electrical Characteristics (MC79M08)

(Refer to test circuit, 0

°C ≤TJ ≤ +125 °C, l

O

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

Note:

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

Parameter Symbol Conditions Min. Typ. Max. Unit

Output Voltage V

O

TJ= +25 °C - 7.7 - 8.0 - 8.3

V

I

O

= 5mA to 350mA

V

I

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

Line Regulation (Note1) ∆V

O

TJ =+25°C

V

I

= -10.5V to -25V - 7.0 80

mV

V

I

= -11V to -21V - 2.0 50

Load Regulation (Note1) ∆V

O

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

Quiescent Current I

Q

TJ= +25 °C-36mA

Quiescent Current Change ∆I

Q

IO = 5mA to 350mA - - 0.4

mA

V

I

= -8V to -25V - - 0.4

Output Voltage Drift ∆V

O

/∆TIO = 5mA - -0.6 - mV/ °C

Output Noise Voltage V

N

f = 10Hz to 100KHz,TA = +25 °C-60-µV

Ripple Rejection RR f = 120Hz,V

I

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

Dropout Voltage V

D

IO = 500mA, TJ = +25 °C-1.1-V

Short Circuit Current I

SC

VI = -35V, TJ = +25 °C - 140 - mA

Peak Current I

PK

TJ = +25 °C - 650 - mA

MC79MXX

5

Electrical Characteristics (MC79M12)

(Refer to test circuit, 0

°C ≤TJ ≤ +125 °C, l

O

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

Note:

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

Parameter Symbol Conditions Min. Typ. Max. Unit

Output Voltage V

O

TJ= +25 °C -11.5 -12 -12.5

V

I

O

= 5mA to 350mA

V

I

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

Line Regulation (Note1) ∆V

O

TJ =+25°C

V

I

= -14.5V to -30V - 8.0 80

mV

V

I

= -15V to -25V - 3.0 50

Load Regulation (Note1) ∆V

O

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

Quiescent Current I

Q

TJ= +25 °C-36mA

Quiescent Current Change ∆I

Q

IO = 5mA to 350mA - - 0.4

mA

V

I

= -14.5V to -30V - - 0.4

Output Voltage Drift ∆V

O

/∆TIO = 5mA - -0.8 - mV/ °C

Output Noise Voltage V

N

f = 10Hz to 100KHz,TA =+25 °C-75-µV

Ripple Rejection RR f = 120Hz,V

I

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

Dropout Voltage V

D

IO = 500mA, TJ = +25 °C-1.1-V

Short Circuit Current I

SC

VI = -35V, TJ = +25 °C - 140 - mA

Peak Current I

PK

TJ= +25 °C - 650 - mA