Negative rail regulator for analog signal chains
The LM79L12ACM/NOPB: As a negative-output device, it generates the low-side supply rail needed by op-amp circuits, data converters, and sensor front-ends that require a bipolar voltage range.
52 dB PSRR — what it means for a clean rail
The 52 dB power-supply rejection ratio at 120 Hz means the regulator attenuates full-wave-rectified ripple from a 60 Hz line by a factor of roughly 400 — the output sees about 2.5 mV of ripple for every 1 V of input ripple at that frequency. A 6 mA quiescent current draw means the regulator's own consumption is manageable in a mixed-signal design where the -12 V rail powers a handful of op-amps or a low-power ADC front end.
Protection and temperature grade
Built-in over-temperature shutdown and short-circuit current limiting protect the regulator and downstream circuitry against a sustained output fault or thermal runaway in a confined enclosure.
Package and PCB integration
The negative input can accept up to -35 V, so a -15 V or -24 V unregulated rail feeds it with enough headroom for the dropout voltage at full load.