LM317KSTEEL ,3-Terminal Adjustable RegulatorElectrical Characteristics (Note 3)=Specifications with standard type face are for T 25˚C, and thos ..
LM317K-TA3-T , HIGH CURRENT 1.3V TO 37V ADJUSTABLE VOLTAGE REGULATOR
LM317KTER ,3-Terminal, 1.5A Adjustable Positive Voltage RegulatorFeatures 3 DescriptionThe LM317 device is an adjustable three-terminal1• Output Voltage Range Adjus ..
LM317KTER ,3-Terminal, 1.5A Adjustable Positive Voltage Regulatorfeatures a typical lineregulation of 0.01% and typical load regulation of• Thermal Overload Protect ..
LM317KTTR ,3/4 Pin 1.5A Adjustable Positive Voltage Regulator 3-DDPAK/TO-263 0 to 125Features... 18 Application and Implementation...... 102 Applications..... 18.1 Application Informat ..
LM317KTTRG3 ,3/4 Pin 1.5A Adjustable Positive Voltage Regulator 3-DDPAK/TO-263 0 to 125Features... 18 Application and Implementation...... 102 Applications..... 18.1 Application Informat ..
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LMC1608TP-56NG , CERAMIC CHIP INDUCTORS
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LM317KSTEEL
3-Terminal Adjustable Regulator
LM117/LM317A/LM317
3-Terminal Adjustable Regulator
General DescriptionThe LM117 seriesof adjustable 3-terminal positive voltage
regulatorsis capableof supplyingin excessof 1.5A overa
1.2Vto 37V output range. Theyare exceptionally easyto
useand require onlytwo external resistorstosetthe output
voltage. Further,both lineand load regulationare better than
standard fixed regulators. Also,the LM117is packagedin
standard transistor packages whichare easily mountedand
handled. additionto higher performance than fixed regulators,the
LM117 series offersfull overload protection available onlyin
IC’s. Includedonthechipare current limit, thermal overload
protectionand safe area protection.All overload protection
circuitry remainsfully functional evenif theadjustment termi-
nalis disconnected.
Normally,no capacitorsare needed unless thedeviceis situ-
ated more than6 inches fromthe input filter capacitorsin
which casean input bypassis needed.An optional output
capacitorcanbe addedto improve transient response.The
adjustment terminalcanbe bypassedto achieve very high
ripple rejection ratios whichare difficultto achieve with stan-
dard 3-terminal regulators.
Besides replacing fixed regulators,the LM117is usefulina
wide varietyof other applications. Sincethe regulatoris
“floating”and sees onlythe input-to-output differential volt-
age, suppliesof several hundred voltscanbe regulatedas
longasthe maximum inputto output differentialisnotex-
ceeded,i.e., avoid short-circuitingthe output.
Also,it makesan especially simple adjustable switching
regulator, aprogrammable output regulator,orby connecting fixed resistor betweenthe adjustmentpinand output,the
LM117canbe usedasa precision current regulator. Sup-
plies with electronic shutdowncanbe achievedby clamping
the adjustment terminalto ground which programsthe out-
putto 1.2V where most loads draw little current.
For applications requiring greater output current,see LM150
series (3A) and LM138 series (5A) data sheets.Forthe
negative complement,see LM137 series data sheet.
Features Guaranteed1% output voltage tolerance (LM317A) Guaranteed max. 0.01%/Vline regulation (LM317A) Guaranteed max. 0.3% load regulation (LM117) Guaranteed 1.5A output current Adjustable output downto 1.2V Current limit constant with temperatureP+ Product Enhancement tested80dB ripple rejection Outputis short-circuit protected
Typical Applications LM117 Series Packages
Part Number Design
Suffix Package Load
Current TO-3 1.5A
TO-39 0.5A TO-220 1.5A
LCC 0.5A TO-263 1.5A
EMP SOT-223 1A
MDT TO-252 0.5A
SOT-223 vs D-Pak (TO-252)
Packages
1.2V–25V Adjustable RegulatorDS009063-1
Full output currentnot available athigh input-outputvoltages
*Neededif deviceismorethan 6inchesfromfilter capacitors.
†Optional—improves transient response. Output capacitorsinthe range1μFto 1000μFof aluminumor tantalum electrolyticare commonlyusedto provideimproved output impedanceandrejection oftransients.
DS009063-54
Scale1:1August 1999
LM1
17/LM317A/LM317
3-T
erminal
Adjustable
Regulator©1999 National Semiconductor Corporation DS009063
