Description:The ISL78228 is a high efficiency, dual synchronous step-down DC/DC regulator that can deliver up to 800mA continuous output current per channel. The supply voltage range of 2. 75V to 5. 5V allows for the use of a 3. 3V or 5V input. The current mode control architecture enables very low duty cycle operation at high frequency with fast transient response and excellent loop stability. The ISL78228 operates above the AM radio band as well as the 2. 25MHz switching frequency, allowing for the use of small, low
Renesas provides a recommended PCB layout guide in their application note AN1995, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure optimal performance.
To ensure reliable startup 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, it's essential to consider the input voltage ripple as well. Renesas recommends keeping the input voltage ripple below 10% of the nominal input voltage to ensure reliable operation and minimize the risk of damage.
To optimize the output filter design, consider the output voltage ripple, output current, and load characteristics. Renesas provides a filter design tool and guidelines in their application note AN1965, which can help you select the optimal output filter components for your specific application.
Thermal design considerations include ensuring adequate airflow, using thermal interfaces (e.g., thermal tape or thermal grease) to improve heat transfer, and providing sufficient thermal vias and copper pours on the PCB. Renesas provides thermal design guidelines and thermal models in their application note AN1995.
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ISL78228ARZ-T7A Overview
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