1 Features 3 Description

1 The LM317A adjustable 3-terminal, positive-voltage • Typical 0.005%/V Line Regulation

regulators are capable of supplying current in excess

• 1% Output Voltage Tolerance of 1.5 A over a 1.25-V to 37-V output range and

• 1.5-A Output Current provide 1% output-voltage accuracy. The LM317A

• Adjustable Output Down to 1.25 V device is available in an SOT-223 package, which

makes it ideal for space-constrained applications that

• Current Limit Constant with Temperature require high-performance regulation. The device is

• 80-dB Ripple Rejection exceptionally easy to use and requires only two

• Short-Circuit Protected Output external resistors to set the output voltage. Both line

regulation and load regulation are better achieved • −40°C to 125°C Operating Temperature Range

with the LM317A device than with standard fixed

regulators. 2 Applications

The LM317A offers full overload protection such as • Automotive LED Lighting current limit, thermal-overload protection, and safe•

Battery Chargers area protection. All overload protection circuitry

• Post Regulation for Switching Supplies remains fully functional even if the adjustment

terminal is disconnected. • Constant-Current Regulator

• Microprocessor Supplies

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