Fixed 1.5 V LDO for noise-sensitive analog rails
The LT1763CS8-1.5#PBF is a positive fixed-output low-dropout regulator from Analog Devices, delivering 500 mA at a regulated 1.5 V. It is built for supply rails that need clean, low-noise power — the 65 dB PSRR at 120 Hz knocks down line ripple before it reaches sensitive analog stages like op-amp supplies, ADC reference buffers, or VCO bias circuits. The fixed 1.5 V output means no external resistor divider; just input, output, and a couple of bypass capacitors and the rail is set.
Dropout voltage and thermal headroom
Maximum dropout is 0.45 V at the full 500 mA load. The enable pin lets a system supervisor gate the output during power sequencing or fault conditions.
Built-in protection reduces BOM count
Overcurrent, overtemperature, and reverse polarity protection are integrated, so no external crowbar or thermal shutdown circuit is needed. That simplifies the BOM for a point-of-load regulator driving a mixed-signal board where a glitch on the 1.5 V rail could corrupt ADC conversions or reset a microcontroller. The fixed output also eliminates the feedback resistor pair, saving two components and one potential drift path.