Description:The ISL9120 and ISL9120IR are highly integrated buck-boost switching regulators that accept input voltages either above or below the regulated output voltage. The regulator automatically transitions between buck and boost modes without significant output disturbance. They also have automatic bypass functionality. When the input voltage is generally within 1% to 2% of the output voltage, there will be a direct bypass connection between the VIN and VOUT pins.In addition to the automatic bypass functionality,
Renesas provides a recommended PCB layout guide in their application note AN1995, which includes guidelines for component placement, thermal management, and routing to minimize noise and ensure optimal performance.
The selection of the output capacitor depends on the output voltage, output current, and ripple requirements. Renesas recommends using a low-ESR ceramic capacitor with a value between 10uF to 22uF for most applications. A more detailed selection guide can be found in the ISL9120 datasheet.
Although the datasheet specifies a maximum input voltage of 5.5V, the ISL9120 can handle input voltages up to 6.5V for short durations (e.g., during power-up or voltage transients). However, continuous operation above 5.5V is not recommended and may affect the device's reliability.
The ISL9120 is rated for operation up to 125°C, but the device's performance and reliability may be affected at high temperatures. Renesas recommends derating the output current and voltage at high temperatures to ensure reliable operation. A more detailed thermal derating guide can be found in the ISL9120 datasheet.
Renesas provides a troubleshooting guide in their application note AN1995, which includes steps to identify and resolve common issues such as oscillations, instability, and output voltage errors. Additionally, Renesas offers technical support and simulation tools to help engineers debug their designs.
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ISL9120IRTAZ-T Overview
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