The recommended PCB layout for the MAX8885EUK25+T involves keeping the input and output capacitors close to the device, using a solid ground plane, and minimizing the length of the traces between the device and the capacitors. Additionally, it's recommended to use a separate power plane for the input voltage and to keep the output voltage traces away from the input voltage traces to minimize noise coupling.
To ensure the MAX8885EUK25+T is stable and doesn't oscillate, make sure to follow the recommended component values and layout guidelines in the datasheet. Additionally, ensure that the input and output capacitors are of high quality and have low ESR, and that the device is properly decoupled from the input voltage source. It's also recommended to add a small ceramic capacitor (e.g. 10nF) between the VCC pin and GND to improve stability.
The maximum input voltage that can be applied to the MAX8885EUK25+T is 5.5V. Exceeding this voltage may damage the device. It's recommended to use a voltage regulator or a voltage limiter to ensure the input voltage stays within the recommended range.
The output voltage of the MAX8885EUK25+T can be calculated using the following formula: VOUT = (VIN x (R1 + R2) / R2) + VREF, where VIN is the input voltage, R1 and R2 are the resistors connected to the FB pin, and VREF is the internal reference voltage (1.25V).
The typical dropout voltage of the MAX8885EUK25+T is around 200mV at a load current of 1A. This means that the input voltage must be at least 200mV higher than the output voltage to ensure proper regulation.
MAX8885EUK25+T datasheet
by Maxim Integrated Products
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