Description:The ISL8088 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 the use of a single Li+ cell, three NiMH cells or a regulated 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 ISL8088 operates at a 2.25MHz switching frequency allowing the use of small, low cost i
Renesas provides a recommended PCB layout in the ISL8088IRZ evaluation board user manual, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure optimal performance.
To ensure stable output voltage during startup and shutdown, it is recommended to add a soft-start capacitor (CSS) between the EN pin and GND, and to use a pull-up resistor (RPU) between the EN pin and VIN. This helps to slow down the startup and shutdown ramps, reducing output voltage overshoot and undershoot.
Although the recommended maximum input voltage is 6.5V, the ISL8088IRZ can withstand up to 7V for short durations (less than 100ms) without damage. However, it is not recommended to operate the device at voltages above 6.5V for extended periods to ensure reliability and prevent long-term damage.
The output voltage ripple and noise can be calculated using the equations provided in the datasheet, which take into account the output capacitor value, ESR, and switching frequency. Additionally, Renesas provides a noise calculation tool on their website to simplify the calculation process.
Renesas recommends using a low-ESR ceramic capacitor (X5R or X7R dielectric) with a value of 10uF to 22uF for the input capacitor. This helps to reduce input voltage ripple and noise, and ensures stable operation of the device.
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ISL8088IRZ Overview
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