Maker : STMicroelectronics
Part No. : LM317K

  Datasheet PDF : LM317K.pdf
  Cross Reference : LM317K Cross Reference
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Product Information

® LM117/217 LM317 1.2V TO 37V VOLTAGE REGULATOR s s s s s OUTPUT VOLTAGE RANGE : 1.2 TO 37V OUTPUT CURRENT IN EXCESS OF 1.5A 0.1% LINE AND LOAD REGULATION FLOATING OPERATION FOR HIGH VOLTAGES COMPLETE SERIES OF PROTECTIONS : CURRENT LIMITING, THERMAL SHUTDOWN AND SOA CONTROL DESCRIPTION The LM117/LM217/LM317 are monolithic integrated circuit in TO-220, ISOWATT220, TO-3 and D2PAK packages intended for use as positive adjustable voltage regulators. They are designed to supply more than 1.5A of load current with an output voltage adjustable over a 1.2 to 37V range. The nominal output voltage is selected by means of only a resistive divider, making the device exceptionally easy to use and eliminating the stocking of many fixed regulators. TO-3 D2PAK TO-220 ISOWATT220 ABSOLUTE MAXIMUM RATING Symbol V i-o IO T op Parameter Input-output Differential Voltage Output Current Operating Junction Temperature for: LM117 LM217 LM317 Power Dissipation Storage Temperature Value 40 Intenrally Limited -55 to 150 -25 to 150 0 to 125 Internally Limited - 65 to 150 o o o Unit V C C o C P tot T st g C THERMAL DATA Symbol Parameter Max Max TO-3 4 35 TO-220 3 50 ISOWATT220 4 60 D2PAK 3 62.5 Unit o o R thj- ca se Thermal Resistance Junction-case R thj- amb Thermal Resistance Junction-ambient C/W C/W November 1999 1/11 LM117/217/317 CONNECTION DIAGRAM AND ORDERING NUMBERS (top view) TO-220 ISOWATT220 D2PAK TO-3 Type LM117 LM217 LM317 TO-3 LM117K LM217K LM317K TO-220 LM217T LM317T ISOWATT220 D PAK LM217D2T 2 LM317P LM317D2T SCHEMATIC DIAGRAM 2/11 LM117/217/317 BASIC ADJUSTABLE REGULATOR ELECTRICAL CHARACTERISTICS (Vi - Vo = 5 V, Io = 500 mA, IMAX = 1.5A and PMAX = 20W, unless otherwise specified) Symbol ∆V o ∆V o Parameter Line Regulation Load Regulation Test Conditions Vi - Vo = 3 to 40 V Vo ≤ 5V Io = 10 mA to IMAX Vo ≥ 5V Io = 10 mA to IMAX I ADJ ∆I ADJ V REF Adjustment Pin Current Adjustment Pin Current Vi - Vo = 2.5 to 40 V Io = 10 mA to IMAX Reference Voltage Vi - Vo = 2.5 to 40 V (between pin 3 and pin Io = 10 mA to IMAX 1) PD ≤ PMAX Output Voltage Temperature Stability Minimum Load Current Vi - Vo = 40 V Maximum Load Current Vi - Vo ≤ 15 V PD < PMAX Vi - Vo = 40 V PD < PMAX o Tj = 25 C eN SVR Output Noise Voltage (percentance of VO) Supply Voltage Rejection (*) B = 10Hz to 10KHz Tj = 25 oC Tj = 25 oC f = 120 Hz C ADJ =0 C ADJ =10µF 66 1.5 1.2 T j = 25 o C T j = 25 C T j = 25 C o o LM117/LM217 Min. Typ. 0.01 0.02 5 20 0.1 0.3 50 0.2 1.25 Max. 0.02 0.05 15 50 0.3 1 100 5 1.3 1.2 Min. LM317 Typ. 0.01 0.02 5 20 0.1 0.3 50 0.2 1.25 Max. 0.04 0.07 25 70 0.5 1.5 100 5 1.3 Unit %/V %/V mV mV % % µA µA V ∆ Vo Vo I o (m in) I o (max ) 1 3.5 2.2 0.4 5 1.5 1 3.5 2.2 0.4 10 % mA A A 0.003 65 80 66 0.003 65 80 % dB dB (*) CADJ is connected between pin 1 and ground. Note: (1) Unless otherwise specified the above specs, apply over the following conditions : LM 117 Tj = – 55 to 150°C; LM 217 Tj = – 25 to 150°C ; LM 317 Tj = 0 to 125°C. 3/11 LM117/217/317 Figure 1 : Output Current vs. Input-output Differential Voltage. Figure 2 : Dropout Voltage vs. Junction Temperature. Figure 3 : Reference Voltage vs. Junction Figure 4 : Basic Adjustable Regulator. APPLICATION INFORMATION The LM117/217/317 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 fig. 4), giving an output voltage VO of: R2 VO = VREF ( 1 + ) + IADJ R2 R1 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 LM117/217317 is a floating regulator and ”sees” only ...

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