Maker : ON Semiconductor
Part No. : LM317M

  Datasheet PDF : LM317M.pdf
  Cross Reference : LM317M Cross Reference
  Buy Component : LM317M Find Stock and Price

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Product Information

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 http://onsemi.com Heatsink surface connected to Pin 2 TO−220AB T SUFFIX CASE 221A 1 2 3 • • • • • • • • 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 Voltage Applications Eliminates Stocking Many Fixed Voltages Pb−Free Packages are Available SOT−223 ST SUFFIX CASE 318E 1 2 3 4 DPAK DT SUFFIX CASE 369C 1 2 3 Vin Vin LM317M Vout Vout R1 240 Heatsink Surface (shown as terminal 4 in case outline drawing) is connected to Pin 2. * Cin 0.1mF IAdj Adjust ** +C O 1.0mF PIN ASSIGNMENT 1 2 3 Adjust Vout Vin R2 ORDERING INFORMATION * = 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. R Vout + 1.25 V 1 ) 2 ) IAdj R2 R1 Since IAdj is controlled to less than 100 mA, the error associated with this term is negligible in most applications. See detailed ordering and shipping information in the package dimensions section on page 12 of this data sheet. DEVICE MARKING INFORMATION See general marking information in the device marking section on page 13 of this data sheet. Figure 1. Simplified Application © Semiconductor Components Industries, LLC, 2004 1 August, 2004 − Rev. 12 Publication Order Number: LM317M/D LM317M MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.) Rating Input−Output Voltage Differential Power Dissipation (Package Limitation) (Note 1) Plastic Package, T Suffix, Case 221A TA = 25°C Thermal Resistance, Junction−to−Air Thermal Resistance, Junction−to−Case Plastic Package, DT Suffix, Case 369C TA = 25°C Thermal Resistance, Junction−to−Air Thermal Resistance, Junction−to−Case Plastic Package, ST Suffix, Case 318E TA = 25°C Thermal Resistance, Junction−to−Air Thermal Resistance, Junction−to−Case Operating Junction Temperature Range Storage Temperature Range Symbol VI−VO Value 40 Unit Vdc PD qJA qJC PD qJA qJC PD qJA qJC TJ Tstg Internally Limited 70 5.0 Internally Limited 92 5.0 Internally Limited 245 15 −40 to +125 −65 to +150 °C/W °C/W °C/W °C/W °C/W °C/W °C °C Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. 1. Figure 25 provides thermal resistance versus pc board pad size. http://onsemi.com 2 LM317M ELECTRICAL CHARACTERISTICS (VI − VO = 5.0 V; IO = 0.1 A, TJ = Tlow to Thigh (Note 2), unless otherwise noted.) LM317M / LM317MB Characteristics Line Regulation (Note 3) (TA = 25°C, 3.0 V ≤ VI − VO ≤ 40 V) Load Regulation (Note 3) TA = 25°C, 10 mA ≤ IO ≤ 0.5 A VO ≤ 5.0 V VO ≥ 5.0 V Adjustment Pin Current Adjustment Pin Current Change 2.5 V ≤ VI − VO ≤ 40 V, 10 mA ≤ IL ≤ 0.5 A, PD ≤ Pmax Reference Voltage 3.0 V ≤ VI − VO ≤ 40 V, 10 ...

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