A good PCB layout for the MAX8794ETB+T involves keeping the input and output capacitors close to the IC, using a solid ground plane, and minimizing the length of the traces between the IC and the capacitors. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended.
To ensure the stability of the output voltage, it is essential to choose the correct output capacitor value and type. A minimum capacitance of 10uF with an ESR of 1ohm or less is recommended. Additionally, the output capacitor should be placed close to the IC, and the feedback resistors should be chosen to ensure a stable feedback loop.
The MAX8794ETB+T can handle a maximum input voltage of 28V. However, it is recommended to operate the IC within the specified input voltage range of 4.5V to 23V for optimal performance and reliability.
The output voltage of the MAX8794ETB+T can be programmed using the FB pin. The output voltage is determined by the ratio of the resistors R1 and R2, which are connected between the FB pin and the output voltage. The output voltage can be calculated using the formula: Vout = 0.8V x (1 + R2/R1).
The MAX8794ETB+T can deliver a maximum output current of 2A. However, the output current should be derated based on the input voltage, output voltage, and ambient temperature to ensure reliable operation.
MAX8794ETB+T datasheet
by Maxim Integrated Products
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