1.2V fixed rail with 465 mV dropout at 1A
The TPS74612PQWDRVRQ1 is a single-output positive LDO from Texas Instruments' automotive-grade family, delivering a fixed 1.2V output at up to 1A. The maximum dropout voltage of 0.465V at full load means the input rail must stay above 1.665V across the operating range to maintain regulation — a 5V or 3.3V supply provides comfortable headroom, but a 1.8V rail at its low tolerance edge may push the dropout margin tight. Quiescent current is 36 µA typical, making this LDO suitable for always-on domains in automotive ECUs where the regulator sits on the battery-backed supply and the standby current budget is measured in tens of microamps.
Texas Instruments lists this part as Active in production with ROHS3 compliance.
PSRR: 53 dB at 1 kHz dropping to 30 dB at 1 MHz
Power-supply rejection ratio is specified as 53 dB at 1 kHz, rolling off to 30 dB at 1 MHz. This profile means the LDO attenuates low-frequency ripple (e.g., 100/120 Hz from a rectified input) by a factor of ~450×, but switching noise above 100 kHz from a DC-DC converter passes through with only about 30 dB of rejection — a 100 mVpp switching ripple on the input appears as roughly 3 mVpp on the output. For noise-sensitive analog loads (sensor bias, ADC reference), an additional LC filter ahead of the LDO or a post-filter at the output may be needed if the upstream switcher operates above 500 kHz.
6-WSON (2x2 mm) with exposed pad — thermal and footprint
The 1A output at 465 mV dropout dissipates up to 465 mW — without the exposed pad soldered to a copper island, the junction temperature rise above ambient can exceed the 125°C limit in a still-air environment. The 0.50 mm pitch and small footprint suit space-constrained automotive modules (camera ECUs, BMS sensor boards, gateway nodes).