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LM317LZ Datasheet(PDF) 9 Page - STMicroelectronics

Part # LM317LZ
Description  Low current 1.2 to 37V adjustable voltage regulator
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LM317LZ Datasheet(HTML) 9 Page - STMicroelectronics

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LM217L/LM317L
Application information
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6
Application information
The LM317L provides an internal reference voltage of 1.25V between the output and
adjustments terminals. This is used to set a constant current flow across an external resistor
divider (see Figure 4.), giving an output voltage VO of:
VO = VREF (1 + R2/R1) + IADJ R2
The device was designed to minimize the term IADJ (100µA max) and to maintain it very
constant with line and load changes. Usually, the error term IADJ × R2 can be neglected. To
obtain the previous requirement, all the regulator quiescent current is returned to the output
terminal, imposing a minimum load current condition. If the load is insufficient, the output
voltage will rise.
Since the LM317L is a floating regulator and "sees" only the input-to-output differential
voltage, supplies of very high voltage with respect to ground can be regulated as long as the
maximum input-to-output differential is not exceeded. Furthermore, programmable regulator
are easily obtainable and, by connecting a fixed resistor between the adjustment and output,
the device can be used as a precision current regulator. In order to optimize the load
regulation, the current set resistor R1 (see Figure 4.) should be tied as close as possible to
the regulator, while the ground terminal of R2 should be near the ground of the load to
provide remote ground sensing.


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