Adjustable 500 mA regulator with industrial temperature range
The LM317MQKTPR from onsemi is an adjustable positive voltage regulator delivering up to 500 mA output current. Its output can be set anywhere from 1.25 V to 37 V using two external resistors, making it a flexible choice for local post-regulation or variable bench supplies. Built-in protection against overcurrent, overtemperature, and short circuits reduces the need for external supervisory circuitry.
PSRR and ripple rejection for analog rails
Power-supply rejection ratio is specified at 80 dB to 65 dB at 120 Hz — the full-wave rectifier ripple frequency. At 80 dB, a 1 V peak-to-peak input ripple is attenuated to roughly 100 µV at the output, which is sufficient for most op-amp and ADC supply rails that do not require an ultra-low-noise LDO.