XR77129ELB-F

Overview

The XR77129ELB-F is a quad-channel programmable digital buck controller from MaxLinear, designed for high-density power applications. It features four synchronous buck outputs with SMBus interface control. The device supports an input voltage range up to 40V and integrates current limit, enable, and frequency control functions. Packaged in a 44-pin TQFN, it operates within a temperature range of -40°C to +125°C. This component serves as a versatile solution for multi-rail power distribution systems requiring precise digital regulation.

Feature Summary

• Quad-channel synchronous buck controller architecture
• SMBus programmable digital interface for configuration
• Integrated current limit and frequency control mechanisms
• Supports wide input voltage ranges up to 40V

Applications

• Multi-rail power distribution in industrial equipment
• Programmable power supplies requiring digital control
• Telecommunications infrastructure power management
• Server and networking hardware power rails

Procurement Notes

Verify component availability status carefully as this part is listed as obsolete by the manufacturer. Confirm end-of-life notifications and production discontinuation timelines with authorized distributors. Ensure that any replacement strategies account for long-term supply chain stability and compatibility with existing design specifications.

Selection Notes

Select this controller for designs requiring multiple regulated outputs from a single high-voltage source. The digital interface allows for dynamic adjustment of output parameters via SMBus. Consider thermal management requirements due to the quad-channel configuration. Evaluate system complexity against the need for programmability versus fixed-output alternatives.

Part Context

This component belongs to the MaxLinear XR77 series of specialized power management ICs. It is specifically engineered for G.hn and similar communication standards requiring complex power sequencing. The series emphasizes digital control capabilities integrated into compact packages suitable for space-constrained electronic assemblies.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the product status is obsolete, consult official manufacturer channels for qualified alternative components or redesign recommendations.