100 mA fixed 3.3 V LDO with automotive temp range
The TPS76933QDBVRG4Q1: Maximum dropout is 0.2 V at the full 100 mA load — the input rail must stay at least 200 mV above 3.3 V across load and temperature to keep the output in regulation.
PSRR and quiescent current for noise-sensitive automotive loads
Power supply rejection ratio is 60 dB at 1 kHz — that attenuates a 100 mV ripple on the input to 100 µV at the output at that frequency. For a sensor supply or analog front-end sharing a rail with a switching converter, this keeps the noise floor low enough for 12-bit resolution without additional post-filtering. Quiescent current is 28 µA typical — the regulator's own draw is below the self-discharge rate of a small automotive battery, making it suitable for always-on modules like body controllers or CAN transceivers that must draw microamps when the ignition is off.
Protection and control features for system reliability
On-chip protection covers over-current, over-temperature, and reverse polarity — the latter is critical in automotive harnesses where a miswired battery connection can otherwise damage downstream ICs. An enable pin allows the system MCU to shut down the regulator when the load is idle, cutting the total current draw to near zero in sleep mode.