A good PCB layout for the MAX9920ASA+ involves keeping the input and output traces short and away from noise sources, using a solid ground plane, and placing the device close to the battery. Additionally, it's recommended to use a 4-layer PCB with a dedicated power plane and a dedicated ground plane.
The choice of external components depends on the specific application and requirements. For the inductor, consider the current rating, inductance value, and DC resistance. For capacitors, consider the capacitance value, voltage rating, and ESR. Refer to the datasheet and application notes for guidance on selecting the right components.
The MAX9920ASA+ can handle input voltages up to 28V, but it's recommended to operate within the specified input voltage range of 4.5V to 18V for optimal performance and reliability.
The MAX9920ASA+ has a built-in overcurrent protection feature that can be enabled by connecting the OCSET pin to a resistor divider network. The resistor values can be calculated based on the desired overcurrent threshold and the internal current limit of the device.
The typical efficiency of the MAX9920ASA+ depends on the input voltage, output voltage, and load current. However, according to the datasheet, the device can achieve an efficiency of up to 95% in some applications.
MAX9920ASA+ datasheet
by Maxim Integrated Products
