Description:The ISL9238 is a buck-boost Narrow Output Voltage DC (NVDC) charger. The ISL9238 provides the NVDC charging, system bus regulation and protection features for tablet, Ultrabook, notebook, power bank, and any USB-C interface platform. The advanced Renesas R3™ Technology provides high light-load efficiency and fast transient response. In Charging mode, the ISL9238 takes input power from a wide range of DC power sources (such as conventional AC/DC charger adapters, USB PD ports, and travel adapters) and safely
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 analog signals near the switching components.
Use a thermal pad or a heat sink to dissipate heat. Ensure good airflow around the device. Monitor the junction temperature (TJ) and adjust the operating conditions or thermal design as needed to keep TJ below the maximum rating (150°C).
Choose capacitors with low ESR, high ripple current rating, and a voltage rating that exceeds the output voltage. Consider the capacitance value, output voltage, and output current requirements. X5R or X7R ceramic capacitors or polymer capacitors are suitable options.
Use an oscilloscope to monitor the input voltage, output voltage, and switching node waveforms. Check for proper PCB layout, component selection, and soldering. Verify the input voltage and current ratings are within specifications. Consult the datasheet and application notes for troubleshooting guidelines.
The OCP and SCP features protect the device from excessive current and short-circuit conditions. However, they may also trigger false shutdowns if not properly configured. Ensure the OCP and SCP thresholds are set correctly, and the device is properly cooled to prevent thermal shutdowns.
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ISL9238HRTZ-T7A Overview
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