LM317AEMP ,3-Terminal Adjustable RegulatorLM117/LM317A/LM317 3-Terminal Adjustable RegulatorJuly 2004LM117/LM317A/LM3173-Terminal Adjustable ..
LM317AEMP/NOPB ,1% Accurate Three-Terminal Adjustable Linear Regulator with Short Circuit Protection 4-SOT-223 -40 to 125Block Diagram... 11Information..... 328.3 Feature Description.... 124 Revision HistoryNOTE: Page nu ..
LM317AEMPX ,3-Terminal Adjustable RegulatorFeaturesminal is disconnected.n Guaranteed 1% output voltage tolerance (LM317A)Normally, no capacit ..
LM317AEMPX ,3-Terminal Adjustable Regulatorapplications. Since the regulator isn Output is short-circuit protected“floating” and sees only the ..
LM317AHV ,3-Terminal Positive Adjustable RegulatorBlock DiagramInput Vin 3+-Voltage ProtectionCircuitryReferenceRlimit2VoOutput1VadjRev. 1.0.12002 Fa ..
LM317AHV ,3-Terminal Positive Adjustable RegulatorFeatures Description• Output Current in Excess of 1.5A This monolithic integrated circuit is an adj ..
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LM317AEMP-LM317AEMPX -LM317AMDT-LM317AT-LM317EMP-LM317EMPX-LM317K STEEL-LM317MDTX-LM317S-LM317SX-LM317T.
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. They are exceptionally easyto
use and require only two external resistorstoset the output
voltage. Further, both line and load regulationare better than
standard fixed regulators. Also, the LM117is packagedin
standard transistor packages which are easily mounted and
handled. additionto higher performance than fixed regulators, the
LM117 series offersfull overload protection available onlyin
IC’s. Includedonthe chipare current limit, thermal overload
protection and safe area protection.All overload protection
circuitry remains fully functional evenif the adjustment ter-
minalis disconnected.
Normally,no capacitors are needed unless the deviceis
situated more than6 inches fromthe input filter capacitorsin
which casean input bypassis needed.An optional output
capacitor canbe addedto improve transient response. The
adjustment terminal canbe bypassedto achieve very high
ripple rejection ratios which are difficultto achieve with stan-
dard 3-terminal regulators.
Besides replacing fixed regulators, the LM117is usefulina
wide varietyof other applications. Since the regulatoris
“floating” and sees only the input-to-output differential volt-
age, suppliesof several hundred volts canbe regulatedas
longas the maximum inputto output differentialis not ex-
ceeded, i.e., avoid short-circuiting the output.
Also,it makesan especially simple adjustable switching
regulator,a programmable output regulator,orby connecting fixed resistor between the adjustmentpin and output, the
LM117 canbe usedasa precision current regulator. Sup-
plies with electronic shutdown canbe 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. For the
negative complement, see LM137 series data sheet.
Features Guaranteed 1% output voltage tolerance (LM317A) Guaranteed max. 0.01%/V line 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
1.2V–25V Adjustable RegulatorFull output currentnot availableat high input-output voltages
*Neededif deviceis more than6 inches from filter capacitors.
†Optional —improves transient response. Output capacitorsinthe range1µFto 1000µFof aluminumor tantalum electrolyticare commonly used provide improved output impedanceand rejectionof transients.
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)
PackagesScale 1:1
July 2004
LM1
17/LM317A/LM317
3-T
erminal
Adjustable
Regulator
