Description:The ISL91128 is a high-current, buck-boost switching regulator for systems using new battery chemistries. It uses the Renesas proprietary buck-boost algorithm to maintain voltage regulation while providing excellent efficiency and very low output voltage ripple when the input voltage is close to the output voltage. The device also includes a selectable Bypass mode for low power consumption in applications that have a Sleep or Low Power mode.The ISL91128 is capable of delivering at least 2.2A continuous outp
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.
Renesas provides a component selection guide in their datasheet, which includes recommendations for input and output capacitors, inductors, and resistors. Additionally, the application note AN1965 provides more detailed guidance on component selection and layout considerations.
The ISL91128IINZ-T is rated for operation from -40°C to +125°C ambient temperature range, but the maximum junction temperature (TJ) should not exceed +150°C. It's essential to ensure proper thermal design and heat sinking to maintain a safe operating temperature.
The ISL91128IINZ-T has a built-in overcurrent protection feature that can be enabled by connecting the OC pin to a resistor and capacitor network. The application note AN1965 provides a detailed example of how to implement overcurrent protection and calculate the required component values.
The recommended startup sequence is to first apply the input voltage (VIN) and then the enable signal (EN). This ensures that the internal voltage regulators are properly initialized and the device is configured correctly before enabling the output.
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ISL91128IINZ-T Overview
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