JAJSQV0E September 2010 – September 2024 TPS74801-Q1
PRODUCTION DATA
The TPS74801-Q1 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 following equations calculate the RMS noise with a 0.001-μF soft-start capacitor for the legacy and new chip, respectively:
The low output noise of the TPS74801-Q1 makes the device a good choice for powering transceivers, PLLs, or other noise-sensitive circuitry.