LP8755KMX/NOPB Equivalent & Substitute Parts

Part Overview

The LP8755KMX/NOPB is a buck switching regulator IC manufactured by Texas Instruments, designed for positive programmable step-down voltage regulation with six independent outputs. This device operates from 2.5V to 5V input and delivers up to 15A per output channel at 4MHz switching frequency. The part is classified as obsolete, making identification of compatible alternatives essential for ongoing system support and new design implementations. Substitute parts must maintain functional equivalence across critical electrical parameters including input voltage range, output voltage programming capability, output current capacity, and thermal operating range.

Substiute Parts

LP8755KMX/NOPB

Texas InstrumentsIn Stock: 2498LP8755KMX/NOPB Datasheet

Current PartRFQ

LP875484YFQR

Texas InstrumentsIn Stock: 2001LP875484YFQR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP8755KMX/NOPB is determined by strict alignment across the following critical parameters:

• Input voltage range: 2.5V to 5V minimum requirement
• Output voltage programmability: 0.6V to 1.67V range
• Number of independent outputs: 6 channels
• Output current capacity: minimum 10A per channel
• Package compatibility: 49-WFBGA, DSBGA form factor
• Synchronous rectification: required
• Operating temperature range: -40°C to 85°C
• Surface mount configuration

The LP875484YFQR qualifies as a manufacturer-recommended substitute. While output current is reduced from 15A to 10A and switching frequency decreases from 4MHz to 3MHz, all other critical parameters remain within acceptable substitution boundaries. The part maintains identical input/output voltage specifications, six-output configuration, programmable output type, package form factor, synchronous rectification, thermal range, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The LP875484YFQR is the manufacturer-recommended substitute for the obsolete LP8755KMX/NOPB. Selection of this alternative is supported by:

• Active product status, ensuring long-term availability and supply chain continuity
• Identical compliance certifications (ROHS3, REACH Unaffected, EAR99 ECCN classification)
• Matching MSL rating and thermal operating range
• Preserved package form factor and mounting configuration
• Maintained input/output voltage specifications and programmability

The primary design consideration is the reduction in per-channel output current from 15A to 10A and switching frequency decrease from 4MHz to 3MHz. System designs must verify that load current requirements do not exceed 10A per output channel and that the lower switching frequency is compatible with output filter and transient response requirements.

Frequently Asked Questions (FAQ)

Q: Can the LP875484YFQR directly replace the LP8755KMX/NOPB without PCB modifications?

A: Yes, both parts use identical 49-WFBGA, DSBGA packaging and surface mount configuration. Pin-to-pin compatibility is maintained. However, output filter design may require adjustment due to the 1MHz reduction in switching frequency.

Q: What is the impact of the 5A reduction in output current (15A to 10A)?

A: The substitute part supports maximum 10A per output channel. Applications requiring greater than 10A per channel cannot use this substitute. Verify all load current specifications remain within the 10A limit.

Q: Are there differences in programmable output voltage range?

A: No. Both parts maintain identical output voltage programming capability from 0.6V to 1.67V across all six channels.

Q: Does the lower switching frequency affect thermal performance?

A: The 3MHz switching frequency in the substitute may result in different thermal characteristics compared to the 4MHz original. Thermal analysis should be performed for the specific application to confirm operating temperature remains within the -40°C to 85°C specification.

Q: Is the substitute part available in the same packaging option?

A: The LP875484YFQR is supplied in Tape & Reel (TR) packaging, while the original part number does not specify packaging format. Both use the 49-DSBGA supplier device package. Verify packaging requirements for your procurement process.

Q: Are compliance certifications identical?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and classified under EAR99 ECCN with matching HTSUS code 8542.39.0001.