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LM117K-LM217D2T-LM217K-LM217T-LM217T.-LM317K-LM317P
1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR
1/14February 2003 OUTPUT VOLTAGE RANGE: 1.2 TO 37V OUTPUT CURRENTIN EXCESS OF 1.5A 0.1% LINE AND LOAD REGULATION FLOATING OPERATION FOR HIGH
VOLTAGES COMPLETE SERIES OF PROTECTIONS:
CURRENT LIMITING, THERMAL
SHUTDOWN AND SOA CONTROL
DESCRIPTION

The LM117/LM217/LM317 are monolithic
integrated circuitin TO-220, TO-220FP, TO-3 and2 PAK packages intended for use as positive
adjustable voltage regulators.
They are designedto supply more than 1.5Aof
load current withan output voltage adjustable over 1.2to 37V range.
The nominal output voltageis selectedby means onlya resistive divider, making the device
exceptionally easyto use and eliminating the
stockingof many fixed regulators.
LM117/217
LM317

1.2V TO 37V VOLTAGE REGULATOR
SCHEMATIC DIAGRAM
LM117/217/317
2/14
ABSOLUTE MAXIMUM RATINGS

AbsoluteMaximum Ratingsare those values beyond which damagetothe device may occur. Functional operation under these conditionis
not implied.
THERMAL DATA
CONNECTION DIAGRAM
(top view)
ORDERING CODES
LM117/217/317
3/14
BASIC ADJUSTABLE REGULATOR
ELECTRICAL CHARACTERISTICS FOR LM117/LM217
(VI -VO =5V,IO= 500 mA, IMAX =1.5A and MAX =20W,TJ= -55to 150°Cfor LM117,TJ= -25to 150°C for LM217, unless otherwise specified).
(*) CADJis connected betweenpin1and ground.
LM117/217/317
4/14
ELECTRICAL CHARACTERISTICS FOR LM317
(VI-VO =5V,IO =500 mA,I MAX= 1.5A and
PMAX =20W,TJ=0to 125°C, unless otherwise specified).
(*) CADJis connected betweenpin1and ground.
Figure1:
Output Currentvs Input-output
Differential Voltage
Figure2:
Dropout Voltagevs Junction
Temperature
LM117/217/317
5/14
Figure3:
Reference Voltagevs Junction
Figure4:
Basic Adjustable Regulator
APPLICATION INFORMATION

The LM117/217/317 providesan internal reference voltageof 1.25V between the output and adjustments
terminals. Thisis usedto seta constant current flow acrossan external resistor divider (see fig.4), giving output voltageVOof: =VREF(1+ R2/R1)+ IADJR2
The device was designedto minimize the term IADJ (100μA max) andto maintainit very constant with line
and load changes. Usually, the error term IADJ ×R2 canbe neglected.To obtain the previous requirement,
all the regulator quiescent currentis returnedto the output terminal, imposinga minimum load current
condition.If the loadis insufficient, the output voltage will rise. Since the LM117/217317isa floating
regulator and "sees" only the input-to-output differential voltage, suppliesof very high voltage with respect ground can be regulated as long as the maximum input-to-output differentialis not exceeded.
Furthermore, programmable regulator are easily obtainable and,by connectinga fixed resistor between
the adjustment and output, the device canbe usedasa precision current regulator.In orderto optimize
the load regulation, the current set resistor R1 (see fig.4) should be tied as close as possibleto the
regulator, while the ground terminalofR2 shouldbe near the groundof the loadto provide remote ground
sensing. Performance maybe improved with added capacitanceas follow: input bypass capacitorof 0.1μF adjustment terminalto ground 10μF capacitorto improve the ripple rejectionof about15 dB (CADJ). 1μF tantalum (or 25μFAluminium electrolytic) capacitoron the outputto improve transient response.In
additionalto external capacitors,itis good practiceto add protection diodes,as shownin fig.5. D1 protect
the device against input short circuit, while D2 protect against output short circuit for capacitance
discharging.
LM117/217/317
6/14
Table5:
Voltage Regulator with Protection Diodes protectthe device against input short circuit, whileD2 protects against output short circuitfor capacitors discharging.
Figure6:
Slow Turn-on 15V Regulator
Figure7:
Current Regulator
LM117/217/317
7/14
Figure8:
5V Electronic Shut-down Regulator
Figure9:
Digitally Selected Outputs
(R2sets maximumVO)
Figure10:
Battery Charger (12V)
*RS sets output impedanceof chargerZO =RS(1+ R2/R1). UseofRS allowslow charging rates whit fully charged battery.
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