Description:The ISL68147 is a digital dual output, flexible multiphase (X+Y ≤ 7) PWM controller developed to support the latest Cavium CN99xx server class processors. The ISL68147 supports the PMbus1. 3 specification and meets the latest Intel server-class transient performance specifications. Either output can be configured to support any desired phase assignments up to a maximum of seven phases across the two outputs (X+Y). For example, 6+1, 5+2, 4+2, 3+3, 3+2, or even a single output operation as a 7+0 configuration
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.
The ISL68147IRAZ-T7A is a highly configurable device, and the configuration for different voltage rails can be done through the I2C interface. Renesas provides a configuration guide in their application note AN1964, which includes examples of how to set up the device for different voltage rails and applications.
The ISL68147IRAZ-T7A can drive a maximum capacitive load of 10nF on the VOUT pin, as specified in the datasheet. However, it's recommended to follow the guidelines in the application note AN1965 for proper output capacitor selection and layout to ensure stable operation.
The ISL68147IRAZ-T7A has built-in OCP and SCP features that can be enabled through the I2C interface. Renesas provides a detailed explanation of how to implement these features in their application note AN1964, including examples of how to set up the threshold values and response times.
Renesas recommends using a high-quality, low-ESR ceramic capacitor with a value of 10uF to 22uF for the input capacitor (CIN). The capacitor should be placed as close as possible to the VIN pin to minimize noise and ensure stable operation.
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ISL68147IRAZ-T7A Overview
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