LM340T12 National Semiconductor, LM340T12 Datasheet

LM340T12

Manufacturer Part Number

LM340T12

Description

Manufacturer

National Semiconductor

Datasheet

1.LM340SX-5.0.pdf (17 pages)

Specifications of LM340T12

Case

TO-220

Date_code

1999

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LM340/LM78XX Series

3-Terminal Positive Regulators

General Description

The

3-terminal positive voltage regulators employ internal

current-limiting, thermal shutdown and safe-area compensa-

tion, making them essentially indestructible. If adequate heat

sinking is provided, they can deliver over 1.0A output cur-

rent. They are intended as fixed voltage regulators in a wide

range of applications including local (on-card) regulation for

elimination of noise and distribution problems associated

with single-point regulation. In addition to use as fixed volt-

age regulators, these devices can be used with external

components to obtain adjustable output voltages and cur-

rents.

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,

although this does improve transient response. Input by-

passing is needed only if the regulator is located far from the

filter capacitor of the power supply.

Typical Applications

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

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

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

∆I

= 1.3 mA over line and load changes.

LM140/LM340A/LM340/LM78XXC

Fixed Output Regulator

Current Regulator

00778103

DS007781

00778101

monolithic

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

steel TO-3 power package. The LM340A/LM340/LM78XXC

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.

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

load regulation (L

OUT

over the temperature range (LM340A)

(LM340A)

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

= 5V + (5V/R1 + I

Product Enhancement tested

Adjustable Output Regulator

) ≈ [(R1 + R2)/R1] (L

) R2 5V/R1

Packages

Scale 1:1

OUT

3 I

OUT

of LM340-5).

2% at T

/A (LM340A)

/V of ∆V

00778102

00778138

= 25˚C and

www.national.com

at 1A load

July 2006

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