lm7800c National Semiconductor Corporation, lm7800c Datasheet

lm7800c

Manufacturer Part Number

lm7800c

Description

Series 3-terminal Positive Regulators

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM7800C.pdf (15 pages)

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LM140/LM340A/LM340/LM7800C

Series 3-Terminal Positive Regulators

General Description

The LM140/LM340A/LM340/LM7800C monolithic 3-terminal

positive voltage regulators employ internal current-limiting,

thermal shutdown and safe-area compensation, making

them essentially indestructible. If adequate heat sinking is

provided, they can deliver over 1.0A output current. They are

intended as fixed voltage regulators in a wide range of appli-

cations including local (on-card) regulation for elimination of

noise and distribution problems associated with single-point

regulation. In addition to use as fixed voltage regulators,

these devices can be used with external components to ob-

tain adjustable output voltages and currents.

Considerable effort was expended to make the entire series

of regulators easy to use and minimize the number of exter-

nal components. It is not necessary to bypass the output, al-

though this does improve transient response. Input bypass-

ing is needed only if the regulator is located far from the filter

capacitor of the power supply.

The 5V, 12V, and 15V regulator options are available in the

steel TO-3 power package. The LM340A/LM340/LM7800C

series is available in the TO-220 plastic power package, and

the LM340-5.0 is available in the SOT-223 package, as well

as the LM340-5.0 and LM340-12 in the surface-mount

TO-263 package.

Typical Applications

response. (If needed, use 0.1 µF, ceramic disc).

Required if the regulator is located far from the power supply filter.

Although no output capacitor is needed for stability, it does help transient

= 1.3 mA over line and load changes.

Fixed Output Regulator

Current Regulator

DS007781-3

DS007781-1

DS007781

load regulation (L

OUT

Features

n Complete specifications at 1A load

n Output voltage tolerances of

n Line regulation of 0.01% of V

n Load regulation of 0.3% of V

n Internal thermal overload protection

n Internal short-circuit current limit

n Output transistor safe area protection

n P

LM140

LM340A/LM340

LM7800C

Comparison between SOT-223 and D-Pak (TO-252)

over the temperature range (LM140A/LM340A)

(LM140A/LM340A)

= 5V + (5V/R1 + I

Device

Product Enhancement tested

)

Adjustable Output Regulator

[(R1 + R2)/R1] (L

Voltages

) R2 5V/R1

5, 12,

5, 8, 12,

Output

Packages

Scale 1:1

3 I

of LM340-5).

TO-3 (K)

TO-3 (K), TO-220 (T),

SOT-223 (MP), TO-263 (S)

(5V and 12V only)

TO-220 (T)

OUT

2% at T

/A (LM140A/LM340A)

/V of V

DS007781-2

DS007781-38

Packages

= 25˚C and

www.national.com

at 1A load

May 1999

Related parts for lm7800c

lm7800c Summary of contents

Page 1

... The 5V, 12V, and 15V regulator options are available in the steel TO-3 power package. The LM340A/LM340/LM7800C series is available in the TO-220 plastic power package, and the LM340-5.0 is available in the SOT-223 package, as well as the LM340-5 ...

Page 2

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 5) DC Input Voltage All Devices except LM7824/LM7824C LM7824/LM7824C Internal Power Dissipation (Note 2) Maximum Junction Temperature Storage ...

Page 3

LM140 Electrical Characteristics −55˚C T +150˚C unless otherwise specified J Output Voltage Symbol Input Voltage (unless otherwise noted) Parameter = 25˚ Output Voltage 15W MIN IN = 500 ...

Page 4

... LM340/LM7800C Electrical Characteristics 0˚C T +125˚C unless otherwise specified J Output Voltage Symbol Input Voltage (unless otherwise noted) Parameter = 25˚ Output Voltage 15W MIN = 500 mA V Line Regulation 25˚C V Load Regulation ...

Page 5

LM7808C Electrical Characteristics = 14V 500 mA, C 0˚C T +150˚ Symbol Parameter V Output Voltage O V Line Regulation O V Load Regulation O V Output Voltage O I Quiescent Q Current I ...

Page 6

Typical Performance Characteristics Output Voltage (Normalized = 25˚ DS007781-25 Note: Shaded area refers to LM340A/LM340, LM7805C, LM7812C and LM7815C. Output Impedance DS007781-28 Peak Output Current DS007781-31 www.national.com (Continued) Ripple Rejection DS007781-26 Dropout Characteristics DS007781-29 Dropout ...

Page 7

Typical Performance Characteristics Line Regulation = 1A 25˚C 140AK-5.0, I OUT A Equivalent Schematic Application Hints The LM340/LM78XX series is designed with thermal protec- tion, output short-circuit protection and output transistor safe area protection. However, as with any ...

Page 8

Application Hints (Continued) the output high can cause damage to internal low current paths in a manner similar to that just described in the “Short- ing the Regulator Input” section. Regulator Floating Ground ( Figure 2 ): When the ground ...

Page 9

Application Hints (Continued) Figures 6, 7 show the information for the SOT-223 package. Figure 6 assumes a of 74˚C/W for 1 ounce copper and (J–A) 51˚C/W for 2 ounce copper and a maximum junction tem- perature of 125˚C. DS007781-41 FIGURE ...

Page 10

Typical Applications (Continued) High Output Current, Short Circuit Protected www.national.com High Current Voltage Regulator DS007781-16 Positive and Negative Regulator 10 DS007781-17 DS007781-18 ...

Page 11

Connection Diagrams and Ordering Information TO-3 Metal Can Package (K) DS007781-11 Bottom View Steel Package Order Numbers: LM140K-5.0 LM140K-12 LM140K-15 LM340K-12 LM340K-15 LM340K-5.0 See Package Number K02A LM140K-5.0/883 LM140K-12/883 LM140K-15/883 See Package Number K02C TO-263 Surface-Mount Package (S) DS007781-20 Top ...

Page 12

Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM140K-5.0, LM340K-5.0, LM140K-12, LM340K-12, LM140K-15, LM340K-15, LM7806CK, LM7808CK, LM7818CK or LM7824CK Order Number LM140K-5.0/883, LM140K-12/883, or LM140K-15/883 www.national.com TO-3 Metal Can Package (K) NS Package Number K02A TO-3 Metal Can Package ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Order Number LM340S-5.0 or LM340S-12 TO-263 Surface-Mount Package (S) NS Package Number TS3B 13 www.national.com ...

Page 14

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Order Number LM340AT/LM340T-5.0, LM340AT/LM340T-12, LM340AT/LM340T-15, LM7805CT, LM7812CT, LM7815CT, LM7806CT, LM7808CT, LM7818CT or LM7824CT www.national.com TO-220 Power Package (T) NS Package Number T03B 14 ...

Page 15

... 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 ...

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