Maker : Vishay Siliconix
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

www.DataSheet4U.com LM317 New Product Vishay formerly General Semiconductor 3-Terminal Adjustable Output Positive Voltage Regulators Pin Arrangement TO-263 (LM317CM) 2 3 3 1 1. Adjust 2. Vout 3. Vin Heatsink is connected to pin 2 Description The LM317 is an adjustable 3-terminal positive voltage regulator capable of supplying in excess of 1.5A over an output voltage range of 1.2V to 37V. 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. TO-220 (LM317CT) 1 2 Features • Output current in excess of 1.5 ampere • Output adjustable between 1.2V and 37V Standard Application Vin Vout LM317 Cin 0.1µF IADJ R1 Adjust 240Ω R2 Co 1µF • Internal thermal overload protection • Internal short-circuit current limiting constant with temperature • Output transistor safe-area compensation • Floating operation for high voltage applications • Eliminates stocking many fixed voltages Notes: 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. Vout = 1.25V (1 + R2 / R1) + IAdj R2 Since IAdj is controlled to less than 100µA, the error associated with this term is negligible in most applications Mechanical Data Case: TO-220 and TO-263 packages Weight: approx. 1.35g Case outlines are on the back page. Input 3 Functional Block Diagram + -Voltage Reference Protection Circuitry Rlimit Vadj 1 2 Output Ratings at 25°C ambient temperature unless otherwise specified. Maximum Ratings Parameter Symbol Vi-Vo TO-220 TO-263 RθJC PD TJ Tstg Value 40 3.0 3.0 15 0 to +125 –65 to +150 Unit Vdc °C W °C °C www.vishay.com 1 Input-Output Voltage Differential Junction-to-Case Thermal Resistance Power Dissipation, 25°C Case Temperature Operating Junction Temperature Range Storage Junction Temperature Range Document Number 74809 30-Oct-02 LM317 Vishay formerly General Semiconductor Electrical Characteristics – LM317 Vi -Vo = 5V, Io = 0.5A, TJ = Tlow to Thigh (see Note 1), Imax and Pmax per Note 2, unless otherwise noted. Parameter Line Regulation (Fig. 1) (3) 3.0V ≤ VI – Vo ≤ 40V Load Regulation (Fig. 2) (3) TJ = 25°C, 10mA ≤ Io ≤ 1.5A Load Regulation (Fig. 2) (3) 10mA ≤ Io ≤ 1.5A Thermal Regulation Adjustment Pin Current (Fig. 3) Adjustment Pin Current Change Reference Voltage (Fig. 3) (4) Temperature Stability (Fig. 3) Min. Load Current to Maintain Regulation (Fig. 3) Maximum Output Current (Fig. 3) RMS Noise, % of Vo Ripple Rejection (Fig. 4) Long-Term Stability (after 1000 hr) Fig. 3 Symbol REG line Conditions TA = 25°C TJ = 0°C thru 125°C Vo ≤ 5.0 Vo ≥ 5.0 Vo ≤ 5.0 Vo ≥ 5.0 TJ = 25°C, 20ms Pulse 10mA ≤ IL ≤ 1.5A 2.5V ≤ VI – Vo ≤ 40V 10mA ≤ Io ≤ 1.5A 3V ≤ VI – Vo ≤ 40V Tlow ≤ TJ ≤ Thigh VI – Vo = 40V VI – Vo ≤ 15V VI – Vo = 40V, TJ = 25°C TJ = 25°C, 10HZ ≤ f ≤ 10KHZ Vo = 10V, f = 120HZ(5) CAdj = 10µF TJ = 125°C(6), TJ = 25°C for Endpoint Measurements Tlow ≤ TJ ≤ Thigh Min. – – – – – – – – – 1.225 – – 1.5 0.15 — — 66 – – Typ. 0.01 0.02 5 0.1 20 0.3 0.03 50 0.2 1.25 1 3.5 2.2 0.4 0.003 65 80 0.3 5.0 Max. 0.04 0.07 25 0.5 70 1.5 0.07 100 5 1.275 – 10 – – – – – 1.0 – Unit %Vo/V mV %Vo mV %Vo %Vo/W µA µA V %Vo mA A %Vo dB % °C/W REG load REG load REG therm IAdj ∆IAdj Vref TS ILmin Imax N RR S RθJC Thermal Resistance Junction to Case Notes: (1) Tlow = 0°C Thigh = 125°C (2) Imax = 1.5A Pmax is internally limited (3) Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. (4) Selected devices with tightened tolerance reference voltage available. (5) CAdj, ...

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