1.5 A adjustable LDO with 120 mV dropout — headroom-critical post-regulation
The TPS74301RGWR: The PSRR profile — 73 dB at 1 kHz rolling off to 42 dB at 800 kHz — tells you this part rejects switching ripple from a 300 kHz to 1 MHz DC-DC converter by roughly 40-70 dB, depending on the switching fundamental.
Protection suite and control interface for unattended rails
Built-in protection covers over-current, over-temperature, short-circuit, and undervoltage lockout (UVLO) — no external supervisor needed for the common fault modes. The Enable, Power Good, and Tracking control features allow sequencing against an FPGA or SoC power-up order: Power Good asserts when the output reaches ~92% of the set voltage, and the Tracking pin lets the output follow an external reference ramp during start-up. Quiescent current is 115 µA typical, rising to 1.5 mA maximum under all conditions. For a battery-powered sensor node that spends most of its time in sleep, the 115 µA Iq is the floor — the regulator's own draw plus the load's sleep current sets the battery life ceiling.