LM340T5 National Semiconductor, LM340T5 Datasheet

LM340T5

Manufacturer Part Number

LM340T5

Description

TO220

Manufacturer

National Semiconductor

Datasheet

1.LM340T5.pdf (15 pages)

Specifications of LM340T5

Date_code

03+

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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

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