XR77129ELB-F Equivalent & Substitute Parts

Part Overview

The XR77129ELB-F is a Buck Regulator Positive Output Step-Down I2C, SMBus DC-DC Controller IC manufactured by MaxLinear, Inc. in a 44-TQFN (7x7) package. This device functions as a multi-output buck controller with 4 outputs and 1 phase, supporting I2C and SMBus serial interfaces for flexible voltage regulation in power management applications.

The XR77129ELB-F is classified as Obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this controller.

Substiute Parts

XR77129ELB-F

MaxLinear, Inc.In Stock: 2009XR77129ELB-F Datasheet

Current PartRFQ

XR76205ELTR-F

MaxLinear, Inc.In Stock: 14844XR76205ELTR-F Datasheet

MFR RecommendedRFQ

XRP7714ILBTR-F

MaxLinear, Inc.In Stock: 5165XRP7714ILBTR-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the XR77129ELB-F are identified based on the following core substitution criteria:

Primary Substitution Parameters:

• Manufacturer: MaxLinear, Inc.
• Category: Power Management (PMIC)
• Function: Step-Down (Buck) topology
• Output Configuration: Positive output
• Synchronous Rectifier: Yes
• Operating Temperature Range: -40°C ~ 125°C (TJ)
• RoHS Compliance: RoHS Compliant
• Mounting Type: Surface Mount

The XR77129ELB-F is a multi-output buck controller with 4 outputs and I2C/SMBus control interfaces. Substitute parts must maintain compatibility with these core functional requirements while accommodating variations in output count, package form factor, and specific electrical characteristics that align with the allowed parameter ranges for buck regulator controllers.

Parameter Comparison

Engineering Selection Recommendations

XR76205ELTR-F is an Active product suitable for applications requiring a single-output buck regulator with adjustable output voltage (0.6V to 40V) and 5A output current capability. This part operates within the same temperature range and maintains RoHS compliance. The reduced output count (1 vs. 4) and lower package pin count (30-QFN vs. 44-TQFN) make this suitable for simplified power management designs. The switching frequency range (100kHz ~ 800kHz) is contained within the XR77129ELB-F range.

XRP7714ILBTR-F is an Active product offering 5 total outputs (4 synchronous buck + 1 linear LDO) with integrated sequencing capability. This part provides expanded output functionality and operates at a fixed 1.5MHz switching frequency. The maximum supply voltage is limited to 25V compared to the XR77129ELB-F's 40V maximum. The 40-TQFN package maintains similar pin density to the original part. This substitute is suitable for multi-rail power management applications requiring both buck and linear regulation with sequencing control.

Both substitute parts are manufactured by MaxLinear, Inc., maintain RoHS compliance, and operate within the -40°C to 125°C temperature range. Selection between substitutes depends on specific application requirements regarding output count, voltage range, and control interface needs.

Frequently Asked Questions (FAQ)

Q: Can the XR76205ELTR-F replace the XR77129ELB-F in all applications?

A: The XR76205ELTR-F is suitable for applications requiring single-output buck regulation. Applications originally designed for 4-output control with the XR77129ELB-F require design modification to accommodate the reduced output count. The XR76205ELTR-F does not include I2C/SMBus interfaces; applications dependent on serial control must evaluate alternative control methods.

Q: What are the key differences between the XRP7714ILBTR-F and the XR77129ELB-F?

A: The XRP7714ILBTR-F provides 5 outputs (4 buck + 1 LDO) versus the XR77129ELB-F's 4 buck outputs. The XRP7714ILBTR-F operates at a fixed 1.5MHz switching frequency and includes integrated sequencing. The maximum supply voltage for the XRP7714ILBTR-F is 25V, which is lower than the XR77129ELB-F's 40V maximum. Both parts use similar package form factors (40-TQFN and 44-TQFN respectively).

Q: Are all substitute parts RoHS compliant?

A: Yes. Both XR76205ELTR-F and XRP7714ILBTR-F are RoHS Compliant, matching the compliance status of the XR77129ELB-F.

Q: What is the impact of package differences on PCB design?

A: The XR76205ELTR-F uses a 30-PowerVFQFN package (5x5), which is smaller than the XR77129ELB-F's 44-WFQFN (7x7) package. The XRP7714ILBTR-F uses a 40-WFQFN package (6x6), which is intermediate in size. PCB layout modifications are required for any package change. Pin assignments and thermal management considerations must be evaluated for each substitute.

Q: Do the substitute parts support I2C/SMBus control like the original part?

A: The XR77129ELB-F includes I2C and SMBus serial interfaces. The XR76205ELTR-F does not specify these interfaces. The XRP7714ILBTR-F does not specify I2C/SMBus interfaces but includes integrated sequencing control. Applications requiring serial communication must confirm interface compatibility with the selected substitute.

Q: What is the operating temperature range for all parts?

A: All three parts operate across the -40°C to 125°C junction temperature range, ensuring thermal compatibility across standard industrial and commercial applications.