Wide-input LDO for always-on and battery-powered rails
The TPS70936DBVR is a fixed 3.6 V output linear regulator from Texas Instruments, delivering up to 150 mA from a 30 V maximum input rail. Its 2.05 µA quiescent current makes it a fit for always-on domains in battery-operated equipment — the regulator's own draw is below the self-discharge rate of a lithium primary cell, so the load sees full shelf life.
PSRR profile and protection set
Power-supply rejection ratio measures 80 dB at 10 Hz, rolling off to 52 dB at 1 kHz — this attenuates 60/120 Hz ripple from a rectified AC rail by a factor of 10,000 at low frequencies, cleaning the supply for sensitive analog front-ends. Built-in protection includes overcurrent, overtemperature, reverse-current blocking, and under-voltage lockout (UVLO) — the reverse-current block prevents the output capacitor from back-driving the input when the supply collapses, a common failure in multi-rail sequencing. Maximum dropout is 1.4 V at the full 150 mA load, so the input rail must stay at least 1.4 V above 3.6 V (5.0 V minimum) to maintain regulation across temperature.