A good PCB layout for the MAX9919NASA+T involves keeping the input and output traces short and wide, using a solid ground plane, and placing the device close to the power source. Additionally, it's recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane to minimize noise and EMI.
To ensure proper powering and decoupling of the MAX9919NASA+T, use a high-quality, low-ESR capacitor (e.g., 10uF ceramic) between the VIN pin and GND, and a smaller capacitor (e.g., 100nF ceramic) between the VCC pin and GND. Place these capacitors as close to the device as possible.
The MAX9919NASA+T can handle input voltages up to 40V, but it's recommended to operate within the specified input voltage range of 4.5V to 36V for optimal performance and reliability.
The MAX9919NASA+T output voltage can be configured using the FB pin. Connect a resistive divider network between the output voltage and GND, with the FB pin connected to the center tap of the divider. The output voltage is determined by the ratio of the resistors in the divider network.
The thermal derating curve for the MAX9919NASA+T is not explicitly stated in the datasheet, but it can be estimated based on the device's thermal resistance (θJA) and maximum junction temperature (TJ). As a general guideline, the device's output current should be derated by 1% for every 1°C increase in ambient temperature above 25°C.
MAX9919NASA+T datasheet
by Maxim Integrated Products
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