Description:The ISL68221 is a digital triple output multiphase (X+Y+Z ≤ 3) PWM controller with PMBus V 1.3 compatibility. The controller can be configured to support any desired phase assignments up to a maximum of three phases across the three outputs (X, Y, and Z). For example, 1+1+1, 1+1+0, or even single output operation as a 3+0 configuration is supported. When combined with the Renesas family of Smart Power Stages and DrMOS devices, designs of exceptional density and performance can be created.The ISL68221 uses t
Renesas provides a recommended PCB layout guide in their application note AN1965, which includes guidelines for thermal vias, copper pours, and component placement to ensure optimal thermal performance.
Renesas provides an inductor selection guide in their application note AN1964, which includes a step-by-step process for selecting the correct inductor based on the specific design requirements, such as output voltage, current, and switching frequency.
According to Renesas, the maximum allowed voltage deviation on the input voltage pin (VIN) is ±10% of the nominal input voltage for reliable operation. Exceeding this deviation may affect the regulator's performance and reliability.
The ISL68221IRAZ-T7A has a built-in overcurrent protection (OCP) feature. To implement OCP, connect a resistor (ROCSET) between the ROCSET pin and GND to set the overcurrent threshold. The datasheet provides a calculation for determining the correct ROCSET resistor value based on the desired overcurrent threshold.
Renesas recommends using a high-quality, low-ESR ceramic capacitor (X5R or X7R dielectric) with a value of 10uF to 22uF for the input capacitor (CIN). This ensures optimal performance, stability, and noise reduction.
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ISL68221IRAZ-T7A Overview
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