How does the TPS79533DCQR handle power supply noise in sensitive analog applications?
How the TPS79533DCQR Handles Power Supply Noise in Sensitive Analog Applications
The TPS79533DCQR is designed to minimise power supply noise in sensitive analog environments such as RF systems, audio circuits, and precision sensors. It achieves this through a combination of low-noise design, strong filtering, and stability features.
Key Noise-Handling Features
-
Ultralow Output Noise
Only 33 µV RMS (with a 0.1 µF bypass capacitor), making it ideal for noise-sensitive analog components. -
High PSRR (Power Supply Rejection Ratio)
Up to 50 dB at 10 kHz, effectively filtering out ripple and noise from the input supply. -
Fast Transient Response
Maintains stable output during sudden load or input voltage changes — critical for ADCs, VCOs, and other precision circuits. -
Stable with Small Ceramic Capacitors
Operates reliably with just a 1 µF ceramic output capacitor, simplifying PCB layout and reducing parasitic noise pickup. -
Low Dropout Voltage
Around 110 mV at full load (500 mA), ensuring regulation even when the input voltage is close to the output.
Why It Matters for Analog Systems
In analog systems — especially RF receivers, audio amplifiers, and precision measurement tools — power supply noise can:
- Degrade performance
- Introduce distortion
- Cause erratic behaviour
The TPS79533DCQR’s low noise, high PSRR, and fast transient response make it a strong choice for these applications.