A good PCB layout for the HF81GS 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 HF81GS operates within its SOA, monitor the input voltage, output current, and junction temperature. Keep the input voltage within the recommended range, limit the output current to the maximum rated value, and ensure the junction temperature does not exceed 125°C.
A low-ESR ceramic capacitor with a value of 10uF to 22uF is recommended for the input capacitor. The capacitor should be placed close to the IC and have a voltage rating of at least 2x the input voltage.
Choose an output capacitor with a low ESR and a value of 10uF to 47uF. The output capacitor should be placed close to the IC and have a voltage rating of at least 2x the output voltage. A ceramic or polymer capacitor is recommended.
The EN (enable) pin is used to turn the regulator on or off. Connect the EN pin to a logic high (VIN or a voltage above 1.4V) to enable the regulator, or connect it to a logic low (GND or a voltage below 0.4V) to disable the regulator.
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HF81GS Overview
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