MP28115DQ-LF-P Equivalent & Substitute Parts

Part Overview

The MP28115DQ-LF-P is a buck switching regulator IC manufactured by Monolithic Power Systems Inc., designed for positive adjustable step-down voltage regulation with 4A output current capability. This component operates across an input voltage range of 2.7V to 6V and provides adjustable output voltage from 0.8V to 5.4V at 1.5MHz switching frequency with integrated synchronous rectification.

The MP28115DQ-LF-P carries a "Not For New Designs" product status, indicating it has been superseded or discontinued for new applications. Identifying qualified substitute components is essential for ongoing production support, legacy system maintenance, and design continuity where this regulator is currently deployed.

Substiute Parts

MP28115DQ-LF-P

Monolithic Power Systems Inc.In Stock: 30525MP28115DQ-LF-P Datasheet

Current PartRFQ

SC174MLTRT

Semtech CorporationIn Stock: 218146SC174MLTRT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MP28115DQ-LF-P is determined by the following critical parameters:

Functional Requirements:

• Step-down (buck) topology with positive adjustable output
• Single output configuration
• 4A output current capability
• Synchronous rectification capability

Electrical Compatibility:

• Input voltage range must encompass or overlap with 2.7V – 6V
• Output voltage adjustability must support the 0.8V minimum threshold
• Switching frequency operation in the megahertz range

Physical & Environmental Compatibility:

• 10-VFDFN Exposed Pad package footprint
• Operating temperature range of -40°C minimum
• Surface mount mounting type
• MSL 1 (Unlimited) moisture sensitivity classification

Regulatory & Compliance:

• RoHS compliance status
• ECCN and HTSUS classifications alignment

The SC174MLTRT qualifies as a substitute based on matching topology, output configuration, current rating, package type, and regulatory compliance, with noted variations in input/output voltage ranges and switching frequency specifications.

Parameter Comparison

Engineering Selection Recommendations

For MP28115DQ-LF-P Replacement:

The SC174MLTRT is qualified as a substitute component based on functional topology match, identical 4A output current rating, matching 10-VFDFN package footprint, and equivalent regulatory compliance (RoHS, ECCN EAR99, HTSUS classification).

Voltage Range Considerations:

The SC174MLTRT input voltage range (3V – 5.5V) is narrower than the MP28115DQ-LF-P (2.7V – 6V). Applications requiring operation below 3V input or above 5.5V input cannot use the SC174MLTRT as a direct substitute. The output voltage ranges are substantially similar with minor differences (0.75V vs. 0.8V minimum; 5.23V vs. 5.4V maximum).

Switching Frequency Variation:

The SC174MLTRT operates at 200kHz – 1MHz, with a maximum frequency 0.5MHz lower than the MP28115DQ-LF-P fixed 1.5MHz. This affects EMI characteristics, component sizing, and transient response. Applications sensitive to switching frequency must evaluate this difference.

Temperature Rating:

The SC174MLTRT supports operation to 125°C (TJ) versus 85°C (TA) for the MP28115DQ-LF-P, providing extended thermal margin in high-temperature environments.

Product Status:

Both components carry "Not For New Designs" status, indicating both are legacy parts. For new designs, consultation with manufacturer datasheets for current-generation alternatives is recommended.

Frequently Asked Questions (FAQ)

Q: Can the SC174MLTRT directly replace the MP28115DQ-LF-P in all applications?

A: Direct substitution is possible only when the application input voltage remains within 3V – 5.5V and switching frequency variation from 1.5MHz to 200kHz – 1MHz does not impact system performance. Applications requiring 2.7V minimum input or 6V maximum input operation cannot use the SC174MLTRT.

Q: What are the key electrical differences between these parts?

A: The primary differences are input voltage range (MP28115DQ-LF-P: 2.7V – 6V; SC174MLTRT: 3V – 5.5V), switching frequency (MP28115DQ-LF-P: fixed 1.5MHz; SC174MLTRT: 200kHz – 1MHz), and maximum operating temperature (MP28115DQ-LF-P: 85°C; SC174MLTRT: 125°C). Output current, topology, and package are identical.

Q: Are the packages physically identical?

A: Yes. Both components use the 10-VFDFN Exposed Pad package with 3x3mm footprint, enabling direct PCB layout compatibility without redesign.

Q: What compliance certifications apply to both parts?

A: Both parts are RoHS compliant, carry ECCN classification EAR99, and share HTSUS code 8542.39.0001. Both have MSL 1 (Unlimited) moisture sensitivity rating.

Q: How does switching frequency difference affect circuit design?

A: The SC174MLTRT's lower maximum switching frequency (1MHz vs. 1.5MHz) results in larger output filter components and different EMI characteristics. PCB layout and filtering component values may require adjustment to maintain equivalent performance.

Q: Which part should be selected for new inventory procurement?

A: Both parts carry "Not For New Designs" status. For ongoing production support of legacy systems, either part is acceptable within the specified electrical constraints. For new designs, current-generation buck regulator alternatives should be evaluated.