Description:The ISL6265C is a multi-output controller with embedded gate drivers. A single-phase controller powers the Northbridge (VDDNB) portion of the CPU. The two remaining controller channels can be configured for two-phase or individual single-phase outputs. For uniplane CPU applications, the ISL6265C is configured as a two-phase buck converter. This allows the controller to interleave channels to effectively double the output voltage ripple frequency, and thereby reduce output voltage ripple amplitude with fewer
A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the switching components (e.g., FETs, inductors) close to the IC, and use short, wide traces for the power paths. Avoid routing sensitive signals near the switching nodes.
Use a thermal pad or a heat sink to dissipate heat. Ensure good airflow around the IC, and avoid blocking the airflow with nearby components. Monitor the junction temperature (TJ) and adjust the design as needed to keep TJ below the maximum rating (150°C).
Choose an inductor with a high saturation current rating, low DCR, and a suitable inductance value (e.g., 1-10 μH). Select capacitors with a high ripple current rating, low ESR, and a suitable capacitance value (e.g., 10-100 μF). Ensure the components can handle the maximum output current and voltage.
Use the FB (feedback) pin to set the output voltage. Connect a resistive divider from the output voltage to the FB pin, and adjust the resistor values to achieve the desired output voltage. Refer to the datasheet for the recommended resistor values and calculation formulas.
Use a common-mode choke and a differential-mode filter to reduce EMI emissions. Add shielding around the switching components and the output stage to reduce radiated emissions. Ensure good grounding and decoupling to minimize noise coupling.
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ISL6265CHRTZ-T Overview
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