Description:The ISL78264 is a dual buck controller that can operate across a wide VIN range of 3.75V to 42V. It is designed to support wide duty-cycle operation for switching frequencies from 200kHz up to 2.2MHz. To mitigate EMI, it supports synchronization to an external clock or programmable spread spectrum clocking. Its current-mode modulator is ideally suited to tolerate severe line transients. Also, the ISL78264 supports dropout operation and low 25ns on-time to operate through automotive cranking and load dump pu
Renesas provides a recommended PCB layout guide in their application note AN1965, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure optimal performance.
To ensure reliable start-up and shutdown, it's essential to follow the recommended power-up and power-down sequencing, as outlined in the datasheet. Additionally, ensure that the input voltage rises and falls monotonically, and that the input capacitance is sufficient to filter out noise and ripple.
While the datasheet specifies the maximum input voltage rating, it's essential to limit the input voltage ripple to ensure reliable operation. Renesas recommends keeping the input voltage ripple below 10% of the nominal input voltage to prevent instability and ensure optimal performance.
To optimize the ISL78264ARZ-T7A for low-power operation, consider using the device's power-save mode, which reduces quiescent current consumption. Additionally, optimize the output voltage and current settings, and consider using a lower input voltage to minimize power losses.
Renesas provides EMI filtering component recommendations and layout guidelines in their application note AN1965. The recommended components include input and output capacitors, as well as a common-mode choke. The layout guidelines emphasize the importance of keeping the switching node (SW) away from sensitive analog nodes and using a solid ground plane to reduce radiated emissions.
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ISL78264ARZ-T7A Overview
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