3V fixed LDO in SC-70-5 — the rail-fit decision
The TLV70030DCKT is a single-output positive LDO from Texas Instruments, delivering a fixed 3V output at up to 200 mA in the 5-pin SC-70-5 (SOT-353) surface-mount package.
PSRR and noise rejection on sensitive rails
The 68 dB PSRR at 1 kHz means the regulator attenuates ripple on the input by a factor of roughly 2500 — a 10 mVpp switching ripple at 1 kHz appears as about 4 µVpp on the output, clean enough for analog front-ends or ADC reference supplies. PSRR rolls off above the regulator's unity-gain crossover; for higher-frequency noise (above ~100 kHz), the attenuation drops to the output capacitor's impedance divider — a low-ESR ceramic output cap maintains rejection into the MHz range.
Quiescent current and protection for battery-powered designs
Typical quiescent current is 55 µA, with a maximum supply current of 270 µA — the regulator's own draw stays below 300 µA even at no load, suiting always-on domains in battery-operated equipment where every microamp counts. Built-in protection includes over-current, over-temperature, reverse polarity, and under-voltage lockout (UVLO) — the UVLO ensures the output stays off until the input rail is high enough to maintain regulation, preventing brownout glitches on downstream logic.
Temperature grade and board integration
Surface-mount on a 5-pin SC-70-5 footprint with 0.65 mm pitch — the enable pin allows external on/off control, and the fixed 3 V output eliminates the need for feedback resistors, saving two components in the BOM.