500 mA LDO with 65 dB PSRR — the noise floor matters
The LT1763IDE-1.5#PBF is a single-output positive LDO regulator delivering 500 mA at a fixed 1.5 V. Its 65 dB PSRR at 120 Hz means ripple from a downstream switching converter or line-frequency rectifier is attenuated by a factor of roughly 1800 — critical for analog front-ends where supply noise couples into the signal path.
Maximum dropout voltage is 0.45 V at 500 mA load. The input rail must stay at least 450 mV above 1.5 V across the full load range to maintain regulation; a 3.3 V bus with a 0.5 V drop in the feed path still leaves margin. Input voltage range extends to 20 V, so the part can be powered from a 12 V or 15 V intermediate bus without an additional pre-regulator. The Enable pin allows external sequencing or shutdown, and the integrated protection suite — over-current, over-temperature, and reverse polarity — covers the common fault modes in bench supplies and distributed power architectures.
Housed in a 12-lead WFDFN with exposed pad (4 mm × 3 mm), the package requires a thermal land on the PCB to sink heat from the die. The Enable pin is active-high and can be tied to the input if sequencing is not required.