Device identity and board-fit
The TPS77533D: The SOIC-8 footprint is a standard 1.27 mm pitch gull-wing — the PCB land pattern is well-documented and the thermal pad on the exposed die attach paddle (if present) should be soldered to a copper plane for heat spreading. No special reflow profile beyond the standard JEDEC MSL level is required.
PSRR and noise-sensitive loads
Power-supply rejection ratio is listed at 60 dB at 100 Hz. This means ripple on the input rail at 100 Hz (e.g., from a rectified mains supply) is attenuated by a factor of 1000 before reaching the output. For an analog front-end or a precision reference, that 60 dB floor at line frequency is the first line of defense against hum coupling into the signal chain.
Dropout voltage and load regulation margin
Maximum dropout voltage is 0.29 V at the full 500 mA load. For a 5 V input rail, that leaves 1.41 V of headroom — plenty for a clean 3.3 V rail even with a 10 % input sag.
Temperature grade and quiescent draw
Operating temperature spans -40°C to 125°C, covering automotive under-hood and industrial enclosure environments. Quiescent current is 125 µA typical — low enough that the regulator's own draw does not dominate the system budget in a battery-powered sensor node that spends most of its time in sleep.
Control and protection features
The TPS77533D includes an Enable pin for on/off control and a Reset output for power-good sequencing. Protection features cover over-current, over-temperature, and reverse polarity — the reverse-polarity clamp prevents damage if the input is accidentally reversed, a common board-level fault.
Lifecycle and compliance
It is ROHS3 compliant — no restricted substances above the threshold.