What this LDO brings to an automotive rail
The Texas Instruments LP5912Q3.0DRVTQ1 is a single-output, fixed 3 V positive linear regulator rated for 500 mA continuous output, qualified to AEC-Q100 for automotive stress and reliability. It comes in a 6-WSON (2x2 mm) package with an exposed pad for thermal dissipation. The part includes Enable, Power Good, and Soft Start control features, plus protection against over-temperature, reverse polarity, and short circuits. With a quiescent current of 55 µA and a maximum supply current of 600 µA, this LDO is suited for always-on automotive modules — body controllers, sensor interface rails, or CAN transceiver supplies — where standby drain matters. The operating temperature range of -40°C to 125°C (junction) covers under-hood and cabin environments.
PSRR and dropout — what they mean for the rail
PSRR is specified at 80 dB at 100 Hz, rolling to 40 dB at 100 kHz. That 80 dB at line-frequency ripple is what cleans up the output from a switching pre-regulator or alternator noise; the roll-off above audio band means the LDO still provides meaningful rejection into the hundreds of kHz, but a downstream filter cap may be needed if the load is sensitive above 100 kHz. For a 3 V rail feeding an analog sensor or ADC reference, this PSRR profile is the main selection parameter. Maximum dropout voltage is 0.25 V at 500 mA. The 6.5 V maximum input gives margin for automotive load-dump transients if protected externally.
Lifecycle and sourcing posture
The LP5912Q3.0DRVTQ1 is listed as Active on TI's product status. It is ROHS3 compliant. No LTB or NRND notice is in effect.