Packaging information
| Package | Pins SOT-223 (DCY) | 4 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 2,500 | LARGE T&R |
Features for the LM317M
- Adjustable output voltage range (VOUT): 1.25V to 37V
- Output current (IOUT): Up to 500mA
- Built-in, short-circuit current limiting and thermal protection
- Stable without any output capacitor
- Operating temperature range: –40°C to +125°C
- Packages:
- 4-pin, 6.5mm × 7mm SOT-223 (RθJA : 77.7°C/W)
- 3-pin, 6.6mm × 10.11mm TO-252 (RθJA : 31.7°C/W)
Description for the LM317M
The LM317M and LM317MQ are adjustable three-pin, positive-voltage regulators capable of supplying an output current of 0.5A over an output voltage range of 1.25V to 37V. The device requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%. The device includes current limiting, thermal overload protection, and safe operating area protection.
The device is a floating regulator meaning there is no device ground terminal. Quiescent current flows to the load instead of being wasted flowing to ground. Regulated output voltage of hundreds of volts is possible if the maximum input to output differential does not exceed 40V at any time. The device functions as a floating current source controlled by a single resistor.
Additionally, the device does not need an output capacitor for stable operation across the load current range. Optionally, add an electrolytic or tantalum output capacitor to improve transient response. Ceramic output capacitors are available, but output ringing is potentially present on transients. Bypass the ADJUST pin with any type of capacitor to achieve high ripple-rejection ratios.