EL7554IRE

Overview

The EL7554IRE is a monolithic synchronous step-down DC/DC regulator manufactured by Intersil, now part of Renesas. It integrates high-side and low-side N-channel power MOSFETs to deliver up to 6A of continuous output current. The device operates with an input voltage range of 3V to 6V and provides an adjustable output voltage from 800mV to 6V. It features a fixed switching frequency of 440kHz, though it supports external synchronization. The IC includes comprehensive protection mechanisms such as cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout.

Feature Summary

• Integrates high-side and low-side N-channel power MOSFETs for compact design
• Provides cycle-by-cycle current limiting and thermal shutdown protection
• Supports external synchronization to the switching frequency
• Includes internal soft-start circuitry to limit inrush current

Applications

• Point-of-load regulation for digital signal processors
• Power supply stages for field-programmable gate arrays
• Voltage regulation for embedded systems and microcontrollers
• Battery-powered portable equipment requiring efficient step-down conversion

Procurement Notes

Verify the manufacturer status, as Intersil operations were acquired by Renesas Electronics. Confirm the specific suffix (e.g., IREZ) for package type and temperature rating. Check for end-of-life notices or obsolescence declarations on official distributor channels. Ensure compatibility with RoHS directives if required for the target market. Validate pinout compatibility against existing board layouts before procurement.

Selection Notes

Select this component when a compact solution is needed for 3V to 6V input applications requiring up to 6A output. The integrated MOSFETs reduce external component count compared to non-integrated controllers. Consider the 440kHz fixed frequency for balancing efficiency and passive size. Verify that the load transient requirements align with the internal control loop capabilities. Evaluate thermal performance based on the expected PCB copper area for heat dissipation.

Part Context

The EL7554 belongs to the EL75xx series of synchronous buck regulators designed for low-voltage, high-current applications. This family emphasizes integration to minimize solution footprint. The device utilizes current-mode control for fast transient response. It is distinct from higher voltage regulators in the lineup due to its specific 6V maximum input rating.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.