500 mA LDO with a PSRR profile that matters for noise-sensitive rails
The TPS74512PQWDRBRQ1 is a single-output, positive fixed LDO from Texas Instruments' automotive-grade portfolio, delivering 500 mA at a 1.2 V fixed output from a maximum 6 V input rail. Its PSRR measures 57 dB at 1 kHz, rolling off to 35 dB at 1 MHz — this means the regulator attenuates switching-regulator ripple at typical 400 kHz–2 MHz frequencies by a factor of roughly 56× to 18×, so downstream analog or RF stages see cleaner rails without an additional LC filter. Quiescent current is 36 µA typical — low enough that in an always-on ECU domain (e.g., a CAN transceiver or keep-alive memory), the LDO's own draw does not dominate the sleep-mode budget.
AEC-Q100 Grade 1 — qualified for under-hood and engine-bay deployment
Protection features include over-current limiting, thermal shutdown, and under-voltage lockout (UVLO) — the UVLO prevents the output from sourcing into a partially-energized rail during a cold crank, and the thermal foldback keeps the die safe if the PCB copper area is undersized for the power dissipation. ROHS3 compliant — no exemptions that would trigger a supply discontinuity under EU RoHS recast.