ISL6439IR-T

DC DC Switching Controllers Overview

The Intersil ISL6439IR-T is a single synchronous step-down PWM controller designed for broadband gateway applications. It operates with an input voltage range of 3.3V to 5V and provides an adjustable output from 0.8V to VIN, maintaining a maximum tolerance of ±1.5%. The device utilizes voltage mode control with a fixed switching frequency of 300kHz. It features a high-bandwidth error amplifier with a 15MHz gain-bandwidth product and 6V/μs slew rate for fast transient response. Protection includes programmable overcurrent sensing via the upper MOSFET's rDS(on).

DC DC Switching Controllers Feature Summary

• Integrates complete control and protection for synchronous buck converters in a compact package.
• Features a high-bandwidth error amplifier enabling rapid transient response across full duty cycle ranges.
• Implements lossless overcurrent protection by monitoring the upper MOSFET drain-source voltage drop.

DC DC Switching Controllers Applications

• Cable modems and DSL modulators
• Set-top box power supplies
• DSP and core communication processor power
• Memory power systems

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'IR-T' against manufacturer legacy documentation to confirm tape-and-reel packaging and industrial temperature grade (-40°C to +85°C). As Intersil was acquired by Renesas, ensure sourcing channels are authorized distributors or utilize Renesas product legacy documents for current availability status and obsolescence notices.

DC DC Switching Controllers Selection Notes

Select this component when designing low-profile DC/DC converters requiring precise voltage regulation within a narrow input window. The integrated charge pump and driver simplify N-channel MOSFET gate driving. Consider the 300kHz fixed frequency for balancing component size and efficiency. Ensure thermal management aligns with the SOIC-14 or QFN-16 footprint constraints.

DC DC Switching Controllers Part Context

The ISL6439 series represents Intersil's solution for efficient power management in communication infrastructure. Following Renesas Electronics' acquisition, these analog ICs are integrated into broader power management portfolios. The IR variant specifically targets industrial operating temperatures, ensuring reliability in demanding broadband gateway environments compared to commercial grades.

DC DC Switching Controllers Replacement Considerations

Consult Renesas Product Legacy Documents for officially confirmed substitute part numbers. Direct replacements may require verification of pin compatibility and electrical parameter alignment with the new manufacturer's specifications.