Noise-sensitive rail regulation
The TPS79913DDCR is a 200 mA low-dropout linear regulator from Texas Instruments, delivering a fixed 1.3 V output from an input up to 6.5 V. Its PSRR profile — 70 dB at 100 Hz, rolling off to 38 dB at 100 kHz — means it rejects ripple from a switching regulator upstream across the audio band and into the switching fundamental, making it a fit for powering analog or RF blocks where supply noise couples into the signal path.
Dropout and headroom budgeting
Maximum dropout is 180 mV at the full 200 mA load. That sets the minimum input-to-output differential: a 1.5 V rail feeding the regulator keeps the output in regulation across the load range. Below that headroom the output falls out of spec. Quiescent current is 60 µA typical — the regulator's own draw stays low enough for battery-powered equipment that spends most of its time in a light-load or standby state.
Protection and control
On-chip protection covers over-current, over-temperature, reverse polarity, and under-voltage lockout (UVLO). The enable pin lets a system sequencer or GPIO hold the output off until the upstream rail is stable.
Package and board fit
Housed in a SOT-23-5 Thin / TSOT-23-5 package, the TPS79913DDCR occupies a compact footprint on the board. The supplier device package is SOT-23-THIN. Surface-mount assembly with standard reflow profiles applies.