A good PCB layout for the FDS9926A involves keeping the high-current paths short and wide, using a solid ground plane, and placing the device close to the load. Additionally, it's recommended to use a shielded inductor and to keep the switching node (SW) away from sensitive analog circuits.
To optimize the FDS9926A for low standby power consumption, ensure that the EN pin is properly biased to turn off the device when not in use. Also, use a high-value resistor (e.g., 1MΩ) to pull up the EN pin to VIN, and consider using a low-leakage diode (e.g., 1N4148) to reduce quiescent current.
The maximum allowed voltage on the VIN pin of the FDS9926A is 28V, with a recommended operating range of 7V to 18V. Exceeding this voltage may damage the device.
To ensure stability, follow the recommended component values and PCB layout guidelines in the datasheet. Additionally, ensure that the output capacitor (COUT) is of sufficient value and has a low equivalent series resistance (ESR). A minimum output capacitance of 10μF is recommended.
The FDS9926A is rated for operation up to 125°C (TJ). However, the device's performance and reliability may degrade at high temperatures. Ensure that the device is properly heatsinked and that the thermal design is adequate for the application.
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