A good PCB layout for the MAX6691MUB+ involves keeping the input and output traces short and wide, using a solid ground plane, and placing the input and output capacitors close to the device. Additionally, it's recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane.
To ensure stability, make sure to follow the recommended component values and PCB layout guidelines. Additionally, ensure that the input and output capacitors are of high quality and have low ESR. It's also important to decouple the input and output with capacitors to prevent oscillation.
The MAX6691MUB+ can handle input voltages up to 32V, but it's recommended to operate within the specified input voltage range of 4.5V to 28V for optimal performance and reliability.
The MAX6691MUB+ is rated for operation up to 125°C, but it's recommended to derate the output current and input voltage at high temperatures to ensure reliability and prevent overheating.
To troubleshoot issues with the MAX6691MUB+, start by checking the input voltage, output voltage, and output current. Use an oscilloscope to check for oscillations or noise on the output. Also, verify that the PCB layout and component values meet the recommended specifications.
MAX6691MUB+ datasheet
by Maxim Integrated Products
