Maxim Integrated provides a recommended PCB layout in the device's evaluation kit documentation, which includes guidelines for component placement, routing, and thermal management to ensure optimal performance and minimize noise.
The output capacitor selection depends on the output voltage, output current, and desired ripple voltage. A general guideline is to choose a capacitor with a minimum capacitance of 10uF, a voltage rating of at least 2x the output voltage, and a low ESR (Equivalent Series Resistance) to minimize output voltage ripple.
Although the datasheet specifies a maximum input voltage of 5.5V, the device can handle input voltages up to 6V for short durations (e.g., during power-up or voltage transients). However, continuous operation above 5.5V may reduce the device's reliability and lifespan.
The MAX6191AESA+T has a built-in overcurrent protection feature that can be enabled by connecting a resistor between the OCSET pin and the output voltage. The value of the resistor determines the overcurrent threshold. Additionally, an external current sense resistor can be used to monitor the output current and implement custom overcurrent protection logic.
The MAX6191AESA+T has a thermal derating of -1.5%/°C, which means that the device's output current capability decreases by 1.5% for every degree Celsius above the maximum operating temperature (Tj = 125°C). This derating ensures the device's reliability and prevents thermal runaway.
MAX6191AESA+T datasheet
by Maxim Integrated Products
