Texas Instruments LM317A
The LM317A adjustable 3-terminal, positive-voltage regulators are capable of supplying current in excess of 1.5 A over a 1.25-V to 37-V output range and provide 1% output-voltage accuracy. Both line regulation and load regulation are better achieved with the LM317A device than with standard fixed regulators. The LM317A offers full overload protection such as over current, thermal-overload protection, and safearea protection.| Part No. | LM317A |
|---|---|
| Datasheet | LM317A Download |
| Manufacturer |  Texas Instruments |
| Description | Three-Terminal Adjustable Regulator |
| Buy | Stock & Price |
FEATURES
●1 For a newer drop-in alternative, see the LM317● Typical 0.005%/V line regulation
● 1% output voltage tolerance
● 1.5-A output current
● Adjustable output down to 1.25 V
● Input-output differential up to 40 V
● Current limit constant with temperature
● No output capacitor required
● Short-circuit protected output
● −40°C to 125°C operating temperature range 2
APPLICATIONS
● Automotive LED lighting● Battery chargers
● Post regulation for switching supplies
● Constant-current regulator
● Microprocessor supplies Typical Application *Needed if device is more than 6 inches from filter capacitors. †Optional—improves transient response †† VOUT = 1.25 V æçè1+ R2 R1 ö ÷ø + IADJ (R2 ) 3
DESCRIPTION
All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. Typically, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors, in which case an input bypass is needed. An optional output capacitor can be added to improve transient response and can be replaced with a ceramic and appropriate ESR.
