Description:The ISL9440B and ISL9440C are quad-output synchronous buck controllers that integrate three PWM controllers and one low drop-out linear regulator controller, which are full featured and designed to provide multi-rail power for use in products such as cable and satellite set-top boxes, VoIP gateways, cable modems, and other home connectivity products as well as a variety of industrial and general purpose applications. Each output is adjustable down to 0. 8V. The PWMs are synchronized at 180° out-of-phase thu
Renesas provides a recommended PCB layout guide in the application note AN1995, which includes guidelines for component placement, routing, and thermal management to ensure optimal performance and minimize electromagnetic interference (EMI).
The selection of input and output capacitors depends on the specific application requirements, such as input voltage, output voltage, and output current. Renesas provides guidelines for capacitor selection in the datasheet and application notes, including the recommended capacitor values and types.
The ISL9440BIRZ-T has an operating ambient temperature range of -40°C to +85°C, but it can be derated for higher temperatures. Refer to the datasheet for the thermal derating curve to determine the maximum ambient temperature for a specific application.
The ISL9440BIRZ-T has a built-in overcurrent protection feature that can be enabled by connecting the OCP pin to a resistor and capacitor network. The datasheet provides a detailed description of the overcurrent protection circuit and the recommended component values.
The recommended input voltage range for the ISL9440BIRZ-T is 6.5V to 24V, but it can operate with input voltages as low as 5.5V and as high as 26V. However, the output voltage and current ratings may be affected at these extreme input voltage ranges.
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ISL9440BIRZ-T Overview
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