Fixed 5V rail with 180mA headroom
The LM9074MX is a fixed 5V positive LDO regulator from Texas Instruments, delivering up to 180 mA continuous output. Maximum dropout voltage is 2.5V at the full 180 mA load, meaning the input rail must stay at least 2.5V above 5V (i.e., ≥7.5V) to maintain regulation across all conditions. The 16.5V maximum input gives headroom for 12V or 15V intermediate rails without an external pre-regulator.
Ripple rejection and protection suite
Power supply rejection ratio (PSRR) is 60 dB at 120 Hz, which attenuates full-wave rectifier ripple by a factor of 1000. For a 1 Vpp ripple on the input, the output sees roughly 1 mVpp — adequate for powering analog front-ends or reference circuits that are sensitive to line-frequency hum. On-chip protection includes over-temperature shutdown, reverse polarity protection, and short-circuit current limiting. These features allow the regulator to survive a miswired battery connection or a sustained output short without external clamp diodes.
Temperature grade and package fit
The enable control pin (active high) lets a microcontroller or supervisor IC gate the output rail, reducing quiescent draw in sleep modes. Output configuration is positive fixed, single regulator.