SBVS082J june 2007 – april 2023 TPS74901
PRODUCTION DATA
The TPS74901 provides low-output noise when a
soft-start capacitor is used. When the device reaches the end of the soft-start
cycle, the soft-start capacitor serves as a filter for the internal reference. By
using a 0.001-µF soft-start capacitor, the output noise is reduced by half and is
typically 30 µVRMS for a 1.2-V output (10 Hz to
100 kHz). Further increasing CSS has
little effect on noise. Because most of the output noise is generated by the
internal reference, the noise is a function of the set output voltage. The RMS noise
with a 0.001-µF soft-start capacitor is given in Equation 1.
The low-output noise of the TPS74901 makes the device a good choice for powering transceivers, PLLs, or other noise-sensitive circuitry.