1 A LDO with ultra-low dropout and high PSRR
The TPS7A1485PYBKR from Texas Instruments is a single-output positive LDO that delivers 1 A continuous current with a fixed output voltage of 0.85 V. Its maximum dropout voltage is just 99 mV at full load, meaning the input rail needs only about 0.95 V to maintain regulation — critical for low-headroom rails like those fed from a 1.2 V or 1.8 V supply bus. Power supply rejection ratio (PSRR) is 80 dB at 100 Hz, rolling off to 33 dB at 1 MHz. This profile means the LDO effectively filters low-frequency ripple from a switching pre-regulator but passes higher-frequency noise above a few hundred kHz — a consideration when the input comes from a fast-switching buck converter without additional post-filtering.
Quiescent current, protection, and package
Quiescent current is 5.7 µA typical, with a maximum supply current of 620 µA. The low Iq makes this LDO suitable for always-on or battery-backed rails where standing current must stay under 10 µA. Built-in protection includes over-current and over-temperature shutdown, plus a current-limit and enable control feature. The device operates over a junction temperature range of -40 °C to 125 °C, covering industrial and automotive ambient requirements. Packaged in a 6-pin DSBGA (0.67 x 1.12 mm), the TPS7A1485PYBKR is a surface-mount device suited for space-constrained PCBs. The small footprint demands careful PCB layout — the exposed die-attach pad must be soldered to a thermal land on the board to achieve the rated current and dropout performance.
Active production and sourcing posture
Sourced through independent distribution channels. Availability and current pricing are confirmed at the time of RFQ against the buyer's BOM quantity.