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LM217LD-LM217LZ-LM317LZ-LM317-LZ
1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR LOW CURRENT
1/10February 2003 OUTPUT VOLTAGE RANGE: 1.2 TO 37V OUTPUT CURRENTIN EXCESS OF 100 mA LINE REGULATION TYP. 0.01% LOAD REGULATION TYP. 0.1% THERMAL OVERLOAD PROTECTION SHORT CIRCUIT PROTECTION OUTPUT TRANSISTOR SAFE AREA
COMPENSATION FLOATING OPERATION FOR HIGH
VOLTAGE APPLICATIONS
DESCRIPTIONThe LM217L/LM317L are monolithic integrated
circuitin SO-8 and TO-92 packages intended for
useas positive adjustable voltage regulators.
They are designedto supply until 100 mAof load
current with an output voltage adjustable overa
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
LM217L
LM317LLOW CURRENT
1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR
SCHEMATIC DIAGRAM
LM217L/LM317L2/10
ABSOLUTE MAXIMUM RATINGS
CONNECTION DIAGRAM (top view)
ORDERING CODES
TEST CIRCUIT
LM217L/LM317L3/10
ELECTRICAL CHARACTERISTICS OF LM217L (referto the test circuits,TJ=-40to 125°C, -VO =5V,IO=40 mA, unless otherwise specified).
(*) CADJis connected between Adjustpinand Ground.
ELECTRICAL CHARACTERISTICS OF LM317L (referto the test circuits,TJ=0to 125°C, -VO =5V,IO=40 mA, unless otherwise specified).
(*) CADJis connected between Adjustpinand Ground.
LM217L/LM317L4/10
Figure1: Current Limit
Figure2: Minimum Operating Current
APPLICATION INFORMATIONThe LM317L provides an 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 voltage VOof:O =V REF(1+R2/R1)+I ADJR2The 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 LM317Lisa floating regulator and "sees" only the input-to-output differential voltage, supplies very high voltage with respectto 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 can be usedasa precision
current regulator.In orderto optimize the load regulation, the current set resistorR1 (see fig.4) shouldbe
tiedas closeas possibleto the regulator, while the ground terminalofR2 shouldbe near the groundof the
loadto provide remote ground sensing.
Figure3: Basic Adjustable Regulator
LM217L/LM317L5/10
Figure4: Voltage Regulator with Protection Diodes
Figure5: Slow Turn-on 15V Regulator
Figure6: Current Regulator
LM217L/LM317L6/10
Figure7: 5V Electronic Shut-down Regulator
Figure8: Digitally Selected Outputs
