Description:The Intersil ISL8723 and ISL8724 are 4 channel sequencers controlling the on and off sequence of voltages with undervoltage supply fault protection and a sequence completed signal (RESET). For larger systems, more than 4 voltages can be sequenced by a simple connection of multiple IC's. These sequencers use an integrated charge pump to drive 4 external low-cost N-channel MOSFET switch gates above the IC bias voltage by 5. 3V. These IC's can be biased from and control any supply from 2. 5V to 5V and addition
Renesas provides a recommended PCB layout in the ISL8723IRZ evaluation board user manual, which includes guidelines for component placement, thermal management, and routing. It's essential to follow these guidelines to minimize noise, ensure proper thermal dissipation, and optimize the device's performance.
The selection of input and output capacitors depends on the specific application requirements, such as output voltage, output current, and ripple voltage. Renesas provides guidelines for capacitor selection in the datasheet, including recommended values for input and output capacitors. Additionally, the application note AN1995 provides more detailed information on capacitor selection and layout considerations.
The ISL8723IRZ is rated for operation from -40°C to +125°C ambient temperature range. However, the device's performance and reliability may be affected at extreme temperatures. It's essential to ensure proper thermal management and consider derating the device's performance at high temperatures.
The ISL8723IRZ has a built-in overcurrent protection feature that can be enabled by connecting the OCP pin to a resistor and capacitor network. The application note AN1995 provides a detailed example of how to implement overcurrent protection, including calculation of the OCP pin resistor and capacitor values.
The recommended startup sequence for the ISL8723IRZ is to first apply the input voltage, followed by the enable signal (EN pin). This ensures that the device is properly biased and configured before the output voltage is enabled. The datasheet provides more detailed information on the startup sequence and timing requirements.
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ISL8723IRZ Overview
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