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LM317M-LM317MABDTRK-LM317MADTRK-LM317MBDT-LM317MBDTRK-LM317MDT..-LM317MDTRK-LM317MDTRKG-LM317MSTT3-LM317MT
500mA, Adjustable Output, Positive Voltage Regulator
LM317M
500 mA Adjustable Output,
Positive Voltage Regulator
The LM317M is an adjustable three−terminal positive voltage
regulator capable of supplying in excess of 500 mA over an output
voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally
easy to use and requires only two external resistors to set the output
voltage. Further, it employs internal current limiting, thermal
shutdown and safe area compensation, making it essentially blow−out
proof.
The LM317M serves a wide variety of applications including local,
on−card regulation. This device also makes an especially simple
adjustable switching regulator, a programmable output regulator, or by
connecting a fixed resistor between the adjustment and output, the
LM317M can be used as a precision current regulator.
Features Output Current in Excess of 500 mA Output Adjustable between 1.2 V and 37 V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Output Transistor Safe−Area Compensation Floating Operation for High V oltage Applications Eliminates Stocking Many Fixed Voltages Pb−Free Packages are Available
Figure 1. Simplified Application�* = Cin is required if regulator is located an appreciable distance from power supply filter.
** = CO is not needed for stability, however, it does improve transient response.
Since IAdj is controlled to less than 100 �A, the error associated with this
term is negligible in most applications.
Vin
CinCO
Vin Vout
Vout� 1.25���V���1�R2�� IAdj��R2
