ISL6439AIB

DC DC Switching Controllers Overview

The ISL6439AIB is a single synchronous buck PWM controller designed for broadband gateway applications. It integrates control, output regulation, monitoring, and protection functions to drive N-channel MOSFETs in a synchronous buck topology. The device operates with an input voltage range of 3.3V to 5V and provides an adjustable output voltage from 0.8V to VIN. It features a fixed-frequency oscillator operating at 600kHz, enabling balanced cost and efficiency. The internal reference voltage maintains a maximum tolerance of ±1.5% across load, line, and temperature variations. The controller utilizes voltage mode PWM control with a high-bandwidth error amplifier for fast transient response.

DC DC Switching Controllers Feature Summary

• Integrates complete control and protection schemes for DC/DC step-down converters within a single package
• Features non-sensing programmable overcurrent protection utilizing the upper MOSFET's rDS(on)
• Provides precise output voltage regulation with internal soft-start functionality
• Supports surface-mount packaging options including 14-pin SOIC and 16-pin QFN

DC DC Switching Controllers Applications

• Cable modems and DSL modems
• Set-top boxes
• DSP and core communication processor power supplies
• Memory power supplies
• Personal computer peripherals

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'IB' corresponds to the 14-SOIC package variant when sourcing. Confirm that the component is sourced from authorized distributors or Renesas Electronics, as Intersil was acquired. Ensure the part meets RoHS standards if required by your design specifications. Cross-reference the datasheet revision to ensure compatibility with your schematic requirements.

DC DC Switching Controllers Selection Notes

Select this controller for designs requiring a compact solution for synchronous buck conversion with integrated overcurrent protection. The 600kHz switching frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the 14-SOIC package for ease of prototyping or the QFN option for space-constrained PCB layouts. Ensure the input voltage range aligns with your system's 3.3V to 5V supply rails.

DC DC Switching Controllers Part Context

The ISL6439AIB belongs to the ISL6439 family of wideband gateway controllers. While the standard ISL6439 operates at 300kHz, the ISL6439A variant specifically operates at 600kHz. This family is engineered for broadband infrastructure, offering a balance between performance and complexity. The technology has been integrated into Renesas Electronics' portfolio following the acquisition of Intersil.

DC DC Switching Controllers Replacement Considerations

Direct substitutes include the ISL6439EVAL1 evaluation board context or other ISL6439 variants depending on frequency requirements. Verify pinout compatibility before replacing. Consult Renesas product legacy documents for approved alternative components.