79lxx.pdf

Order this document by MC79L00/D

The MC79L00, A Series negative voltage regulators are inexpensive,

easy–to–use devices suitable for numerous applications requiring up to100

mA. Like the higher powered MC7900 Series negative regulators, this series

features thermal shutdown and current limiting, making them remarkably

rugged. In most applications, no external components are required for

operation.

The MC79L00 devices are useful for on–card regulation or any other

application where a regulated negative voltage at a modest current level is

needed. These regulators offer substantial advantage over the common

resistor/zener diode approach.

•

THREE–TERMINAL LOW

CURRENT NEGATIVE FIXED

VOLTAGE REGULATORS

SEMICONDUCTOR

TECHNICAL DATA

No External Components Required

P SUFFIX

PLASTIC PACKAGE

CASE 29

•

Internal Short Circuit Current Limiting

•

Internal Thermal Overload Protection

Pin 1. Ground

2. Input

3. Output

•

Low Cost

1 2

•

Complementary Positive Regulators Offered (MC78L00 Series)

•

Available in Either ± 5% (AC) or ± 10% (C) Selections

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SOP–8)*

Pin 1. V out

2. V in

3. V in

4. NC

5. GND

6. V in

7. V in

8. NC

Representative Schematic Diagram

* SOP–8 is an internally modified SO–8 package.

Pins 2, 3, 6, and 7 are electrically common to the

die attach flag. This internal lead frame modifica-

tion decreases package thermal resistance and

increases power dissipation capability when

appropriately mounted on a printed circuit board.

SOP–8 conforms to all external dimensions of the

standard SO–8 package.

Gnd

R18

Q10

Device No.

Nominal

Voltage

R17

10%

MC79L05C

MC79L12C

MC79L15C

MC79L18C

MC79L24C

MC79L05AC

MC79L12AC

MC79L15AC

MC79L18AC

MC79L24AC

–5.0

–12

–15

–18

–24

Q14

R16

Output

ORDERING INFORMATION

Q12

Q13

Operating

Temperature Range

Device

Package

Q11

R10 R11

MC79LXXACD*

SOP–8

Plastic Power

R14

R15

MC79LXXACP

T J = 0

to +125

Input

MC79LXXCP

MC79LXXABD*

MC79LXXABP*

Plastic Power

* Automotive temperature range selections are available with special test conditions

* and additional tests in 5, 12 and 15 V devices. Contact your local Motorola sales

* office for information.

T J = –40 ° to +125 ° C

SOP–8

Plastic Power

XX indicates nominal voltage

W Motorola, Inc. 1996

Rev 2

MOTOROLA ANALOG IC DEVICE DATA

MC79L00, A Series

MAXIMUM RATINGS (T A = +25 ° C, unless otherwise noted.)

Rating

Symbol

Value

Unit

Input Voltage (–5 V)

Input Voltage (–12, –15, –18 V)

Input Voltage (–24 V)

V I

–30

–35

–40

Vdc

Storage Temperature Range

T stg

–65 to +150

ELECTRICAL CHARACTERISTICS (V I = –10 V, I O = 40 mA, C I = 0.33 m F, C O = 0.1 m F, –40 ° C < T J +125 ° C (for MC79LXXAB),

0 ° C < T J < +125 ° C (for MC79LXXAC)).

T J

+150

MC79L05C, AB

MC79L05AC, AB

Characteristics

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

Output Voltage (T J = +25 ° C)

V O

–4.6

–5.0

–5.4

–4.8

–5.0

–5.2

Vdc

Input Regulation

(T J = +25 ° C)

–7.0 Vdc

Reg line

V I

–20 Vdc

–

200

150

–

150

100

–8.0 Vdc

V I

–20 Vdc

Load Regulation

T J = +25

Reg load

C, 1.0 mA

I O

100 mA

–

1.0 mA

I O

40 mA

Output Voltage

–7.0 Vdc

V O

Vdc

V I

–20 Vdc, 1.0 mA

I O

40 mA

–4.5

–

–5.5

–4.75

–

–5.25

V I = –10 Vdc, 1.0 mA

I O

70 mA

Input Bias Current

(T J = +25

I IB

(T J = +125

–

6.0

5.5

–

6.0

5.5

Input Bias Current Change

–8.0 Vdc . V I . –20 Vdc

1.0 mA 3 I O 3 40 mA

I IB

–

1.5

0.2

–

1.5

0.1

Output Noise Voltage

(T A = +25 ° C, 10 Hz 3 f 3 100 kHz)

V n

–

m V

Ripple Rejection

(–8.0

–

V I

–18 Vdc, f = 120 Hz, T J = +25

Dropout Voltage (I O = 40 mA, T J = +25 ° C)

|V I –V O |

–

1.7

–

1.7

–

Vdc

ELECTRICAL CHARACTERISTICS (V I = –19 V, I O = 40 mA, C I = 0.33 m F, C O = 0.1 m F, –40 ° C < T J +125 ° C (for MC79LXXAC),

C (for MC79LXXAB)).

MC79L12C, AB

MC79L12AC, AB

Characteristics

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

Output Voltage (T J = +25

V O

–11.1

–12

–12.9

–11.5

–12

–12.5

Vdc

Input Regulation

(T J = +25

Reg line

–14.5 Vdc . V I . –27 Vdc

–16 Vdc . V I . –27 Vdc

–

250

200

–

250

200

Load Regulation

T J = +25 ° C, 1.0 mA 3 I O 3 100 mA

1.0 mA 3 I O 3 40 mA

Reg load

–

100

–

100

Output Voltage

–14.5 Vdc . V I . –27 Vdc, 1.0 mA 3 I O 3 40 mA

V I = –19 Vdc, 1.0 mA 3 I O 3 70 mA

V O

Vdc

–10.8

–

–13.2

–11.4

–

–12.6

Input Bias Current

(T J = +25

I IB

(T J = +125 ° C)

–

6.5

6.0

–

6.5

6.0

Input Bias Current Change

–16 Vdc

I IB

V I

–27 Vdc

–

1.5

0.2

–

1.5

0.2

1.0 mA

I O

40 mA

Output Noise Voltage

(T A = +25

V n

–

m V

C, 10 Hz

100 kHz)

Ripple Rejection

(–15 3 V I 3 –25 Vdc, f = 120 Hz, T J = +25 ° C)

–

Dropout Voltage (I O = 40 mA, T J = +25 ° C)

|V I –V O |

–

1.7

–

1.7

–

Vdc

MOTOROLA ANALOG IC DEVICE DATA

Junction Temperature

C < T J < +125

MC79L00, A Series

ELECTRICAL CHARACTERISTICS (V I = –23 V, I O = 40 mA, C I = 0.33 m F, C O = 0.1 m F, –40 ° C < T J +125 ° C (for MC79LXXAB),

0 ° C < T J < +125 ° C (for MC79LXXAC)).

MC79L15C

MC79L15AC, AB

Characteristics

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

Output Voltage (T J = +25

V O

–13.8

–15

–16.2

–14.4

–15

–15.6

Vdc

Input Regulation

(T J = +25 ° C)

–17.5 Vdc

Reg line

V I

–30 Vdc

–

300

250

–

300

250

–20 Vdc

V I

–30 Vdc

Load Regulation

T J = +25 ° C, 1.0 mA 3 I O 3 100 mA

1.0 mA

Reg load

–

150

–

150

I O

40 mA

Output Voltage

–17.5 Vdc . V I . –Vdc, 1.0 mA 3 I O 3 40 mA

V I = –23 Vdc, 1.0 mA 3 I O 3 70 mA

V O

Vdc

–13.5

–

–16.5

–14.25

–

–15.75

Input Bias Current

(T J = +25

I IB

(T J = +125

–

6.5

6.0

–

6.5

6.0

Input Bias Current Change

–20 Vdc . V I . –30 Vdc

1.0 mA 3 I O 3 40 mA

D I IB

–

1.5

0.2

–

1.5

0.1

Output Noise Voltage

(T A = +25

V N

–

C, 10 Hz

100 kHz)

Ripple Rejection

(–18.5

–

V I

–28.5 Vdc, f = 120 Hz)

Dropout Voltage

I O = 40 mA, T J = +25 ° C

|V I –V O |

–

1.7

–

1.7

–

Vdc

ELECTRICAL CHARACTERISTICS (V I = –27 V, I O = 40 mA, C I = 0.33 m F, C O = 0.1 m F, 0 ° C < T J > +125 ° C, unless otherwise noted).

MC79L18C

MC79L18AC

Characteristics

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

Output Voltage (T J = +25 ° C)

V O

–16.6

–18

–19.4

–17.3

–18

–18.7

Vdc

Input Regulation

(T J = +25 ° C)

–20.7 Vdc . V I . –33 Vdc

–21.4 Vdc . V I . –33 Vdc

–22 Vdc . V I . –33 Vdc

–21 Vdc

Reg line

V I

–33 Vdc

–

325

275

–

325

–

275

Load Regulation

T J = +25

Reg load

C, 1.0 mA

I O

100 mA

–

170

–

170

1.0 mA 3 I O 3 40 mA

Output Voltage

–20.7 Vdc . V I . –33 Vdc, 1.0 mA 3 I O 3 40 mA

–21.4 Vdc . V I . –33 Vdc, 1.0 mA 3 I O 3 40 mA

V I = –27 Vdc, 1.0 mA

V O

Vdc

–

–16.2

–

–19.8

–17.1

–

–17.1

–

–18.9

–

–18.9

I O

70 mA

Input Bias Current

(T J = +25 ° C)

(T J = +125 ° C)

I IB

–

6.5

6.0

–

6.5

6.0

Input Bias Current Change

–21 Vdc . V I . –33 Vdc

–27 Vdc . V I . –33 Vdc

1.0 mA 3 I O 3 40 mA

I IB

–

1.5

0.2

–

1.5

–

0.1

Output Noise Voltage

(T A = +25

V n

–

150

–

150

–

C, 10 Hz

100 kHz)

Ripple Rejection

(–23 3 V I 3 –33 Vdc, f = 120 Hz, T J = +25 ° C)

–

Dropout Voltage

I O = 40 mA, T J = +25 ° C

|V I –V O|

–

1.7

–

1.7

–

Vdc

MOTOROLA ANALOG IC DEVICE DATA

MC79L00, A Series

ELECTRICAL CHARACTERISTICS (V I = –33 V, I O = 40 mA, C I = 0.33 m F, C O = 0.1 m F, 0 ° C < T J < +125 ° C, unless otherwise noted).

MC79L24C

MC79L24AC

Characteristics

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

Output Voltage (T J = +25 ° C)

V O

–22.1

–24

–25.9

–23

–24

–25

Vdc

Input Regulation

(T J = +25 ° C)

–27 Vdc . V I . –38 Vdc

–27.5 Vdc . V I . –38 Vdc

–28 Vdc . V I . –38 Vdc

Reg line

–

350

300

–

350

–

300

Load Regulation

T J = +25 ° C, 1.0 mA 3 I O 3 100 mA

1.0 mA 3 I O 3 40 mA

Reg load

–

200

100

–

200

100

Output Voltage

–27 Vdc

V O

Vdc

V I

–38 V, 1.0 mA

I O

40 mA

–

–21.4

–

–26.4

–22.8

–

–22.8

–

–25.2

–

–25.2

–28 Vdc

V I

–38 Vdc, 1.0 mA

I O

40 mA

V I = –33 Vdc, 1.0 mA 3 I O 3 70 mA

Input Bias Current

(T J = +25

I IB

(T J = +125

–

6.5

6.0

–

6.5

6.0

Input Bias Current Change

–28 Vdc . V I . –38 Vdc

1.0 mA 3 I O 3 40 mA

D I IB

–

1.5

0.2

–

1.5

0.1

Output Noise Voltage

(T A = +25

V n

–

200

–

200

–

m V

C, 10 Hz

100 kHz)

Ripple Rejection

(–29

–

V I

–35 Vdc, f = 120 Hz, T J = +25

Dropout Voltage

I O = 40 mA, T J = +25

|V I –V O |

–

1.7

–

1.7

–

Vdc

APPLICATIONS INFORMATION

Design Considerations

The MC79L00, A Series of fixed voltage regulators are

designed with Thermal Overload Protections that shuts down

the circuit when subjected to an excessive power overload

condition, Internal Short Circuit Protection that limits the

maximum current the circuit will pass.

In many low current applications, compensation

capacitors are not required. However, it is recommended that

the regulator input be bypassed with a capacitor if the

regulator is connected to the power supply filter with long wire

length, or if the output load capacitance is large. An input

bypass capacitor should be selected to provide good

high–frequency characteristics to insure stable operation

under all load conditions. A 0.33 m F or larger tantalum, mylar,

or other capacitor having low internal impedance at high

frequencies should be chosen. The bypass capacitor should

be mounted with the shortest possible leads directly across

the regulator’s input terminals. Normally good construction

techniques should be used to minimize ground loops and

lead resistance drops since the regulator has no external

sense lead. Bypassing the output is also recommended.

Figure 1. Positive and Negative Regulator

Figure 2. Standard Application

Input

MC79LXX

Output

+V in

MC78LXX

+V O

C I *

0.33

C O **

0.1

0.33

0.1

0.1 m F

–V in

MC79LXX

–V O

A common ground is required between the input and the output

voltages. The input voltage must remain typically 2.0 V above

the output voltage even during the low point on the ripple voltage.

0.33 m F

* C I is required if regulator is located an appreciable

* distance from the power supply filter

** C O improves stability and transient response.

MOTOROLA ANALOG IC DEVICE DATA

MC79L00, A Series

TYPICAL CHARACTERISTICS

(T A = +25 ° C, unless otherwise noted.)

Figure 3. Dropout Characteristics

Figure 4. Dropout Voltage versus

Junction Temperature

8.0

–2.5

6.0

MC79L05C

V O = –5.0 V

T J = 25 ° C

–2.0

I O = 70 mA

–1.5

I O = 40 mA

I O = 1.0 mA

I O = 100 mA

4.0

I O = 1.0 mA

–1.0

2.0

I O = 40 mA

–0.5

Dropout of Regulation is

defined when

D V O = 2% of V O

0 0

–2.0

–4.0

–6.0

–0.8

–10

0 0

100

125

V in , INPUT VOLTAGE (V)

, JUNCTION TEMPERATURE ( ° C)

Figure 5. Input Bias Current versus

Ambient Temperature

Figure 6. Input Bias Current versus

Input Voltage

4.2

5.0

4.0

3.8

3.6

3.0

MC79L05C

V O = –5.0 V

I O = 40 mA

3.4

2.0

MC79L05C

V in = –10 V

V O = –5.0 V

I O = 40 mA

3.2

3.0

1.0

0 0

100

125

0 0

–5.0

–10

–15

–20

–25

–30

–35

–40

T A , AMBIENT TEMPERATURE ( ° C)

V in , INPUT VOLTAGE (V)

Figure 7. Maximum Average Power Dissipation

versus Ambient Temperature (TO–92)

Figure 8. SOP–8 Thermal Resistance and Maximum

Power Dissipation versus P.C.B. Copper Length

10,000

170

3.2

150

P D(max) for T A = +50 ° C

2.8

130

2.4

1,000

No Heatsink

110

Graph represe nts symm etrical layou t

2.0

2.0 oz.

Copper

1.6

100

1.2

3.0 mm

Q JA = 200 ° C/W

P D(max) to 25

0.8

C = 625 mW

0.4

100

125

150

T A , AMBIENT TEMPERATURE (

L, LENGTH OF COPPER (mm)

MOTOROLA ANALOG IC DEVICE DATA

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