Description:Ultra High PSRR 98dB at 1kHz, 48dB at 100kHz; Ultra Low Output Noise 10 µVRMS; Very Low Dropout 150mV at 450mA; Operating Input Voltage Range 1.9V to 5.5V; Ultra Low Quiescent current 18 µA; Available in CSP4 0.35P and XDFN4 0.65P package; Available in industry standard TSOP5 package
A good PCB layout for optimal thermal performance would be to have a solid ground plane on the bottom layer, and to use thermal vias to connect the exposed pad to the ground plane. This helps to dissipate heat efficiently.
To ensure reliable start-up in a noisy environment, it's recommended to add a soft-start circuit to limit the inrush current and to use a high-quality input capacitor to filter out noise. Additionally, consider adding a voltage supervisor to monitor the input voltage and ensure the converter starts up only when the input voltage is within the specified range.
The maximum allowed capacitance for the output capacitor depends on the specific application and the desired output voltage ripple. As a general guideline, the output capacitance should be limited to 10-20 times the input capacitance to avoid instability. For the NCP161AFCS500T2G, a maximum output capacitance of 100uF is recommended.
To troubleshoot oscillations or instability in the converter, first check the PCB layout and ensure that the layout is correct and follows the recommended layout guidelines. Next, check the component values and ensure they are within the specified tolerance. If the issue persists, try adding a small capacitor (e.g. 10nF) between the VCC pin and GND to filter out high-frequency noise.
The recommended input capacitor type is a low-ESR ceramic capacitor, such as an X5R or X7R dielectric capacitor. The recommended value is 10-22uF, depending on the specific application and the desired input voltage ripple.
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NCP161AFCS500T2G Overview
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