LM317 3-Pin Adjustable Regulator

1 Features

Output voltage range:
- Adjustable: 1.25V to 37V
Output current: 1.5A
Line regulation: 0.01%/V (typ)
Load regulation: 0.1% (typ)
Internal short-circuit current limiting
Thermal overload protection
Output safe-area compensation (new chip)
PSRR: 80dB at 120Hz for C_ADJ = 10μF (new chip)
Packages:
- 4-pin, SOT-223 (DCY)
- 3-pin, TO-263 (KTT)
- 3-pin, TO-220 (KCS, KCT), legacy chip

*Needed if the device is more than 6 inches from filter capacitors.
†Optional, improves transient response.
^††See Equation 1.
Equation 1. $V_{O U T} = 1.25 V \times (1 + \frac{R_{2}}{R_{1}}) + I_{A D J} \times (R_{2})$

Typical Application