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LM7808C
3-Terminal Positive Regulators
LM340/LM78XX Series
3-Terminal Positive Regulators
General DescriptionThe LM140/LM340A/LM340/LM78XXC monolithic
3-terminal positive voltage regulators employ internal
current-limiting, thermal shutdown and safe-area compensa-
tion, making them essentially indestructible.If adequate heat
sinkingis provided, they can deliver over 1.0A output cur-
rent. Theyare intendedas fixed voltage regulatorsina wide
rangeof applications including local (on-card) regulationfor
eliminationof noise and distribution problems associated
with single-point regulation.In additionto useas fixed volt-
age regulators, these devices canbe used with external
componentsto obtain adjustable output voltages and cur-
rents.
Considerable effort was expendedto makethe entire series regulators easyto use and minimizethe numberof exter-
nal components.Itis not necessaryto bypass the output,
although this does improve transient response. Input by-
passingis needed onlyifthe regulatoris locatedfar fromthe
filter capacitorof the power supply.
The 5V, 12V, and 15V regulator options are availablein the
steel TO-3 power package. The LM340A/LM340/LM78XXC
seriesis availableinthe TO-220 plastic power package, and
the LM340-5.0is availableinthe SOT-223 package,as well the LM340-5.0 and LM340-12in the surface-mount TO-
263 package.
Features Complete specificationsat1A load Output voltage tolerancesof ±2%atTj= 25˚C and ±4%
overthe temperature range (LM340A) Line regulationof 0.01%of VOUT/Vof ΔVINat1A load
(LM340A) Load regulationof 0.3%of VOUT/A (LM340A) Internal thermal overload protection Internal short-circuit current limit Output transistor safe area protectionP+ Product Enhancement tested
Typical Applications
Fixed Output Regulator Adjustable Output Regulator*Requiredifthe regulatoris locatedfar fromthe power supply filter.
**Althoughno output capacitoris neededfor stability,it doeshelp transient
response.(If needed,use0.1µF, ceramic disc).
VOUT=5V+ (5V/R1+IQ)R2 5V/R1> 3IQ,
load regulation(Lr)≈ [(R1+ R2)/R1](Lrof LM340-5).
Current Regulator
Comparison between SOT-223 and D-Pak (TO-252)
PackagesΔIQ=1.3mA overlineandload changes.
Scale 1:1
November 2004
LM340/LM78XX
Series
3-T
erminal
Positive
Regulators
