Fairchild Semiconductor MC79L18A Datasheet

www.fairchildsemi.com

Rev. 1.0.2

Features

• Output Current up to 100mA

• No External Components

• Internal Thermal Over Load Protection

• Internal Short Circuit Current Limiting

• Output Voltage Offered in ±5% Tolerance

• Output Voltage of -5V, -8V, -12V, -15V, -18V, -24V

Description

These regulators employ internal current limiting and thermal shutdown, making them essentially indestructible.

TO-92

1

8-SOP

SOT-89

1

1.GND 2.Input 3.Output

1. Output 2.3.6.7. Input 5. GND 4.8. NC

1

Internal Block Diagram

Q1

Q2

Q3

Q4

Q5

Q6

Q7

Q8

Q9

Q10

Q11

Q12

Q13Q14

Q15

Q16

Q17

R1 R2

R3

R4

R5

R6

R7

R15

R16

R17

R18

R26

R22

R24 R25

R29

R

R28

R23+R21

R27

D3

D2

D1

C1

GND

Output

Input

MC79LXXA/LM79LXXA

3-Terminal 0.1A Negative Voltage Regulator

MC79LXXA/LM79LXXA

2

Absolute Maximum Ratings

Electrical Characteristics(MC79L05A/LM79L05A)

(VI = -10V, IO = 40mA, CI = 0.33µF, CO = 0.1µF, 0°C ≤T

J

≤ +125°C, unless otherwise specified)

Note:

1. Load and line regulation are specified at constant junction temperature. Change 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 (for V

o

= -5V to -8V)

(for V

O

= -12V to -18V)

(for V

O

= -24V)

V

I

-30

-35

-40

V

Operating 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

TJ = +25°C -4.8 -5.0 -5.2 V

Line Regulation (Note1) ∆V

O

TJ =+25°C

-7.0V ≥ V

I

≥ -20V - 15 150 mV

-8V ≥ VI ≥ -20V - - 100 mV

Load Regulation (Note1) ∆V

O

TJ =+25°C

1.0mA ≤ I

O

≤ 100mA - 20 60 mV

1.0mA ≤ I

O

≤ 40mA - 10 30 mV

Output Voltage V

O

-7.0V≥ V

I

≥ -20V, 1.0mA ≤ IO ≤ 40mA -4.75 - -5.25 V

V

I

= -10V, 1.0mA ≤ I

O

≤ 70mA -4.75 - -5.25 V

Quiescent Current I

Q

TJ =+25°C-2.05.5

mA

T

J

= +125°C--6.0

Quiescent Current Change

With Line ∆I

Q

-8V ≥ V

I

≥ -20V - - 1.5 mA

With Load ∆I

Q

1.0mA ≤ I

O

≤ 40mA - - 0.1 mA

Output Noise Voltage V

N

TA = +25°C,10Hz ≤ f ≤ 100kHz - 30 - µV

Ripple Rejection RR

f = 120Hz, -8V ≥ V

I

≥ -18V

T

J

= +25°C

41 60 - dB

Dropout Voltage V

D

TJ = +25°C-1.7-V

MC79LXXA/LM79LXXA

3

Electrical Characteristics (MC79L08A)

(Continued)

(VI = -14V, IO = 40mA, CI = 0.33µF, CO = 0.1µF, 0°C ≤T

J

≤ +125°C, unless otherwise specified)

Note:

1. Load an d lin e re gul ation ar e spec ifie d at con sta nt ju nct ion t empe rat ure. Chan ge i n 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

TJ = +25°C -7.7 -8.0 -8.3 V

Line Regulation(Note1) ∆V

O

TJ = +25°C

-10.3V ≥ V

I

≥ -23V - - 175 mV

-12V ≥ VI ≥ -23V - - 125 mV

Load Regulation (Note1) ∆V

O

TJ = +25°C

1.0mA ≤ I

o

≤ 100mA - - 80 mV

1.0mA ≤ I

o

≤ 40mA - - 40 mV

Output Voltage V

O

-10.3V ≥ V

I

≥ -23V, 1.0mA ≤ Io ≤ 40mA -7.6 - -8.4

V

I

= -14V, 1.0mA ≤ I

o

≤ 70mA -7.6 - -8.4

Quiescent Current I

q

Tj = +25°C--6.0

mA

T

j

= +125°C--5.5

Quiescent Current Change

With Line

∆I

Q

-11.7V ≥ V

I

≥ -23V - - 1.5 mA

With Load 1.0mA ≤ I

o

≤ 40mA - - 0.1 mA

Output Noise Voltage V

N

Tj = +25°C,10Hz ≤ f ≤ 100kHz - 50 - µV

Ripple Rejection RR

f = 120Hz, -11V ≥ V

I

≥ -21V

T

j

= +25°C

39 55 - dB

Dropout Voltage V

D

Tj = +25°C-1.7-V

MC79LXXA/LM79LXXA

4

Electrical Characteristics(MC79L12A)

(Continued)

(VI = -19V, IO = 40mA, CI = 0.33µF, CO = 0.1µF, 0°C ≤T

J

≤ +125°C, unless otherwise specified)

Note:

1. Load and line regulation are specified at constant junction temperature. Change 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

TJ = +25°C -11.5 -12.0 -12.5 V

Line Regulation (Note1) ∆V

O

TJ = +25°C

-14.5V ≥ V

I

≥ -27V - - 250 mV

-16V ≥ VI ≥ -27V - - 200 mV

Load Regulation (Note1) ∆V

O

TJ = +25°C

1.0mA ≤ I

O

≤ 100mA - - 100 mV

1.0mA ≤ I

O

≤ 40mA - - 50 mV

Output Voltage V

O

-14.5V > V

I

> -27V, 1.0mA ≤ IO ≤ 40mA -11.4 - -12.6 V

V

I

= -19V, 1.0mA ≤ I

O

≤ 70mA -11.4 - -12.6 V

Quiescent Current I

Q

TJ = +25°C--6.0

mA

T

J

= +125°C--6.5

Quiescent Current Change

With Line ∆I

Q

-16V ≥ V

I

≥ -27V - - 1.5 mA

With Load ∆I

Q

1.0mA ≤ I

O

≤ 40mA - - 0.1 mA

Output Noise Voltage V

N

TA = +25°C,10Hz ≤ f ≤ 100kHz - 80 - µV

Ripple Rejection RR

f = 120Hz, -15V≥ V

I

≥ -25V

T

J

= +25°C

37 42 - dB

Dropout Voltage V

D

TJ = +25°C-1.7-V