1 A automotive LDO with 53 dB PSRR floor
The TPS746115PQWDRBRQ1 is a single-output, positive-fixed LDO from Texas Instruments' automotive-grade portfolio, delivering 1 A continuous at a fixed 1.15 V output. Its PSRR curve starts at 53 dB at 1 kHz and rolls off to 30 dB at 1 MHz, which means it attenuates switching-regulator ripple and alternator whine across the frequency band where most automotive power-train noise lives. The 36 µA quiescent current keeps the regulator's own draw low enough for always-on battery-backed systems like body controllers or telematics units that must not drain the standby battery.
Dropout headroom and thermal budget at full load
Maximum dropout is 0.79 V at 1 A output — the input rail must stay at least 0.79 V above 1.15 V across the full load range, or the output falls out of regulation. The Enable and Power Good pins let a system controller sequence the rail and confirm it's ready before enabling downstream loads.
Protection set eliminates external supervisory ICs
Over-current, over-temperature, and under-voltage lockout (UVLO) protection are integrated on-die. The UVLO threshold prevents the output from turning on until the input rail is high enough to keep the pass FET in regulation, which avoids brownout glitches during cold-crank events. Over-temperature shutdown protects the die if the thermal pad is poorly soldered or the ambient exceeds 125°C. Together these features let the LDO serve as a self-contained power rail without a separate supervisor or reset generator.