LM79L05ACM - National Semiconductor

LM320L/LM79LXXAC Series

3-Terminal Negative Regulators

General Description

The LM320L/LM79LXXAC dual marked series of 3-terminal

negative voltage regulators features fixed output voltages of

−5V, −12V, and −15V with output current capabilities in

excess of 100mA. These devices were designed using the

latest computer techniques for optimizing the packaged IC

thermal/electrical performance. The LM79LXXAC series,

even when combined with a minimum output compensation

capacitor of 0.1µF, exhibits an excellent transient response,

a maximum line regulation of 0.07% V

/V, and a maximum

load regulation of 0.01% V

/mA.

The LM320L/LM79LXXAC series also includes, as

self-protection circuitry: safe operating area circuitry for out-

put transistor power dissipation limiting, a temperature inde-

pendent short circuit current limit for peak output current

limiting, and a thermal shutdown circuit to prevent excessive

junction temperature. Although designed primarily as fixed

voltage regulators, these devices may be combined with

simple external circuitry for boosted and/or adjustable volt-

ages and currents. The LM79LXXAC series is available in

the 3-lead TO-92 package, and SO-8; 8 lead package. The

LM320L series is available in the 3-lead TO-92 package.

For output voltage other than −5V, −12V and −15V, the

LM137L series provides an output voltage range from 1.2V

to 47V.

Features

nPreset output voltage error is less than ±5% overload,

line and temperature

nSpecified at an output current of 100mA

nEasily compensated with a small 0.1µF output

capacitor

nInternal short-circuit, thermal and safe operating area

protection

nEasily adjustable to higher output voltages

nMaximum line regulation less than 0.07% V

OUT

nMaximum load regulation less than 0.01% V

OUT

/mA

Typical Applications Connection Diagrams

Fixed Output Regulator

DS007748-1

*Required if the regulator is located far from the power supply filter. A 1µF

aluminum electrolytic may be substituted.

**Required for stability. A 1µF aluminum electrolytic may be substituted.

Adjustable Output Regulator

DS007748-3

−V0= −5V − (5V/R1 + IQ)•R2,

5V/R1 >3I

SO-8 Plastic (Narrow Body)

DS007748-4

Top View

Order Number LM79L05ACM, LM79L12ACM

LM79L15ACM, LM79L05ACMX,

LM79L12ACMX or LM79L15ACMX

See NS Package Number M08A

TO-92 Plastic Package (Z)

DS007748-2

Bottom View

Order Number LM320LZ-5.0, LM79L05ACZ,

LM320LZ-12, LM79L12ACZ, LM320LZ-15 or

LM79L15ACZ

See NS Package Number Z03A

September 2001

LM320L/LM79LXXAC Series 3-Terminal Negative Regulators

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Input Voltage

= −5V, −12V, −15V −35V

Internal Power Dissipation (Note 2) Internally Limited

Operating Temperature Range 0˚C to +70˚C

Maximum Junction Temperature +125˚C

Storage Temperature Range −55˚C to +150˚C

Lead Temperature

(Soldering, 10 sec.) 260˚C

Electrical Characteristics (Note 3)

= 0˚C to +70˚C unless otherwise noted.

Output Voltage −5V −12V −15V

Input Voltage (unless otherwise noted) −10V −17V −20V Units

Symbol Parameter Conditions Min Typ Max Min Typ Max Min Typ Max

VOOutput Voltage TJ= 25˚C, IO= 100mA −5.2 −5 −4.8 −12.5 −12 −11.5 −15.6 −15 −14.4

1mA ≤IO≤100mA −5.25 −4.75 −12.6 −11.4 −15.75 −14.25

VMIN ≤VIN ≤VMAX (−20 ≤VIN ≤−7.5) (−27 ≤VIN ≤−14.8) (−30 ≤VIN ≤−18) V

1mA ≤IO≤40mA −5.25 −4.75 −12.6 −11.4 −15.75 −14.25

VMIN ≤VIN ≤VMAX (−20 ≤VIN ≤−7) (−27 ≤VIN ≤−14.5) (−30 ≤VIN ≤−17.5)

∆VOLine Regulation TJ= 25˚C, IO= 100mA 60 45 45 mV

VMIN ≤VIN ≤VMAX (−20 ≤VIN ≤−7.3) (−27 ≤VIN ≤−14.6) (−30 ≤VIN ≤−17.7) V

TJ= 25˚C, IO= 40mA 60 45 45 mV

VMIN ≤VIN ≤VMAX (−20 ≤VIN ≤−7) (−27 ≤VIN ≤−14.5) (−30 ≤VIN ≤−17.5) V

∆VOLoad Regulation TJ= 25˚C 50 100 125 mV

1mA ≤IO≤100mA

∆VOLong Term Stability IO= 100mA 20 48 60 mV/khrs

IQQuiescent Current IO= 100mA 2 6 2 6 2 6 mA

∆IQQuiescent Current 1mA ≤IO≤100mA 0.3 0.3 0.3

Change 1mA ≤IO≤40mA 0.1 0.1 0.1 mA

IO= 100mA 0.25 0.25 0.25 mA

VMIN ≤VIN ≤VMAX (−20 ≤VIN ≤−7.5) (−27 ≤VIN ≤−14.8) (−30 ≤VIN ≤−18) V

VnOutput Noise Voltage TJ= 25˚C, IO= 100mA 40 96 120 µV

f = 10Hz − 10kHz

Ripple Rejection TJ= 25˚C, IO= 100mA 50 52 50 dB

f = 120Hz

Input Voltage TJ= 25˚C, IO= 100mA −7.3 −14.6 −17.7 V

Required to IO= 40mA −7.0 −14.5 −17.5 V

Maintain Line

Regulation

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

functional, but do not guarantee specific performance limits.

Note 2: Thermal resistance of Z package is 60˚C/W θJC, 232˚C/W θJA at still air, and 88˚C/W at 400 ft/min of air. The M package θJA is 180˚C/W in still air.

The maximum junction temperature shall not exceed 125˚C on electrical parameters.

Note 3: To ensure constant junction temperature, low duty cycle pulse testing is used.

LM320L/LM79LXXAC

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Typical Performance Characteristics

Maximum Average Power

Dissipation (TO-92)

DS007748-11

Peak Output Current

DS007748-12

Short Circuit Output

Current

DS007748-13

Dropout Voltage

DS007748-14

Ripple Rejection

DS007748-15

Output Voltage vs.

Temperature (Normalized

to 1V @25˚C)

DS007748-16

Quiescent Current

DS007748-17

Output Impedance

DS007748-18

LM320L/LM79LXXAC

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Typical Applications

Schematic Diagrams

±15V, 100mA Dual Power Supply

DS007748-6

−5V

DS007748-9

LM320L/LM79LXXAC

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Schematic Diagrams (Continued)

−12V and −15V

DS007748-10

LM320L/LM79LXXAC

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Physical Dimensions inches (millimeters) unless otherwise noted

S.O. Package (M)

Order Number LM79L05ACM, LM79L12ACM, LM79L15ACM,

LM79L05ACMX, LM79L12ACMX, or LM79L15ACMX

NS Package Number M08A

Molded Offset TO-92 (Z)

Order Number LM320LZ-5.0, LM79L05ACZ, LM320LZ-12,

LM79L12ACZ, LM320LZ-15 or LM79L15ACZ

NS Package Number Z03A

LM320L/LM79LXXAC

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Notes

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL

COUNSEL OF NATIONAL 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

whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

safety or effectiveness.

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www.national.com

LM320L/LM79LXXAC Series 3-Terminal Negative Regulators

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.