Maker : ON Semiconductor
Part No. : LM317

Datasheet PDF : LM317.pdf
Cross Reference : LM317 Cross Reference
Buy Component : LM317 Find Stock and Price

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Product Information

LM317, NCV317 1.5 A Adjustable Output, Positive Voltage Regulator The LM317 is an adjustable 3−terminal positive voltage regulator capable of supplying in excess of 1.5 A 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 LM317 serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM317 can be used as a precision current regulator. Features http://onsemi.com 1 2 3 D2PAK−3 D2T SUFFIX CASE 936 • • • • • • • Output Current in Excess of 1.5 A Output Adjustable between 1.2 V and 37 V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Constant with Temperature Output Transistor Safe−Area Compensation Floating Operation for High Voltage Applications Available in Surface Mount D2PAK−3, and Standard 3−Lead Transistor Package • Eliminates Stocking many Fixed Voltages • Pb−Free Packages are Available Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2. TO−220 T SUFFIX CASE 221A 1 2 3 Pin 1. Adjust 2. Vout 3. Vin Heatsink surface connected to Pin 2. Vin LM317 Vout R1 240 Adjust + C ** O 1.0 mF ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet. IAdj Cin* 0.1 mF R2 DEVICE MARKING INFORMATION See general marking information in the device marking section on page 10 of this data sheet. ** 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 V out + 1.25 V 1 ) 2 R1 ) I R Adj 2 Since IAdj is controlled to less than 100 mA, the error associated with this term is negligible in most applications. Figure 1. Standard Application © Semiconductor Components Industries, LLC, 2004 1 April, 2004 − Rev. 7 Publication Order Number: LM317/D LM317, NCV317 MAXIMUM RATINGS Rating Input−Output Voltage Differential Power Dissipation Case 221A TA = +25°C Thermal Resistance, Junction−to−Ambient Thermal Resistance, Junction−to−Case Case 936 (D2PAK−3) TA = +25°C Thermal Resistance, Junction−to−Ambient 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 TJ Tstg Internally Limited 65 5.0 Internally Limited 70 5.0 −55 to +150 −65 to +150 W °C/W °C/W W °C/W °C/W °C °C ELECTRICAL CHARACTERISTICS (VI−VO = 5.0 V; IO = 0.5 A for D2T and T packages; TJ = Tlow to Thigh (Note 1); Imax and Pmax (Note 2); unless otherwise noted.) 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 ≤ Imax VO ≤ 5.0 V VO ≥ 5.0 V Thermal Regulation, TA = +25°C (Note 4), 20 ms Pulse Adjustment Pin Current Adjustment Pin Current Change, 2.5 V ≤ VI−VO ≤ 40 V, 10 mA ≤ IL ≤ Imax, PD ≤ Pmax Reference Voltage, 3.0 V ≤ VI−VO ≤ 40 V, 10 mA ≤ IO ≤ Imax, PD ≤ Pmax Line Regulation (Note 3), 3.0 V ≤ VI−VO ≤ 40 V Load Regulation (Note 3), 10 mA ≤ IO ≤ Imax VO ≤ 5.0 V VO ≥ 5.0 V Temperature Stability (Tlow ≤ TJ ≤ Thigh) Minimum Load Current to Maintain Regulation (VI−VO = 40 V) Maximum Output Current VI−VO ≤ 15 V, PD ≤ Pmax, T Package VI−VO = 40 V, PD ≤ Pmax, TA = +25°C, T Package RMS Noise, % of VO, TA = +25°C, 10 Hz ≤ f ≤ 10 kHz Ripple Rejection, VO = 10 V, f = 120 Hz (Note 5) Without CAdj CAdj = 10 mF Long−Term Stability, TJ = Thigh (Note 6), TA = +25°C for Endpoint Measurements Thermal Resistance Junction ...

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