MP4655GY-Z Equivalent & Substitute Parts

Part Overview

The MP4655GY-Z is an LED driver controller IC manufactured by Monolithic Power Systems Inc., classified as a Power Management PMIC. This device functions as a 1-output DC DC controller with flyback topology, designed for LED backlight applications. It operates across a supply voltage range of 9V to 35V and supports both analog and PWM dimming control at frequencies between 20kHz and 350kHz. The part is currently active in production status and available in 28-SOIC surface mount packaging.

Equivalent and substitute parts are identified when they meet the core functional requirements of LED driver control, maintain compatible electrical specifications, and support the same dimming methodologies. Substitute selection becomes necessary when the primary part experiences supply constraints, when alternative topologies better suit specific application requirements, or when packaging alternatives are preferred for manufacturing optimization.

Substiute Parts

MP4655GY-Z

Monolithic Power Systems Inc.In Stock: 1274MP4655GY-Z Datasheet

Current PartRFQ

LM3409HVMY/NOPB

Texas InstrumentsIn Stock: 55489LM3409HVMY/NOPB Datasheet

MFR RecommendedRFQ

LM3423MHX/NOPB

Texas InstrumentsIn Stock: 9777LM3423MHX/NOPB Datasheet

MFR RecommendedRFQ

MAX1698AEUB+

Analog Devices Inc./Maxim IntegratedIn Stock: 817MAX1698AEUB+ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MP4655GY-Z are qualified based on the following criteria:

Functional Equivalence: All substitute parts must function as LED driver controller ICs with single output capability and support for analog and/or PWM dimming control.

Electrical Compatibility: Substitute parts must operate within overlapping or extended supply voltage ranges that encompass the primary part's 9V to 35V specification. Operating temperature ranges must support the -40°C to 125°C requirement or maintain compatibility within the specified thermal envelope.

Topology Flexibility: While the primary part uses flyback topology, substitute parts may employ alternative topologies (step-down, step-up, SEPIC) provided they deliver equivalent functional performance for LED driver applications.

Packaging and Mounting: Substitute parts must be surface mount devices. Package form factors may differ from the primary 28-SOIC specification, as long as they are commercially available and suitable for board-level integration.

Compliance and Status: All substitute parts must maintain active product status and comply with RoHS3 and REACH requirements equivalent to the primary part.

Parameter Comparison

Engineering Selection Recommendations

LM3409HVMY/NOPB (Texas Instruments): This substitute operates within the primary part's supply voltage range (6V minimum extends below the MP4655GY-Z specification, while 75V maximum exceeds it). The step-down topology provides functional equivalence for LED driver applications. Automotive-grade qualification and active product status support long-term availability. The 10-HVSSOP package represents a significant size reduction compared to 28-SOIC, suitable for space-constrained designs. Analog and PWM dimming support matches the primary part's control capabilities.

LM3423MHX/NOPB (Texas Instruments): This substitute offers the widest supply voltage range (4.5V to 75V), encompassing the primary part's 9V to 35V specification with substantial margin. Multi-topology capability (SEPIC, step-down, step-up) provides design flexibility for various LED driver configurations. Operating temperature range matches the primary part exactly. The 20-HTSSOP package provides a moderate footprint between the primary and LM3409 alternatives. Analog and PWM dimming support is confirmed. Moisture sensitivity level 1 (unlimited) indicates superior moisture resistance compared to the primary part's MSL 3 rating.

MAX1698AEUB+ (Analog Devices Inc./Maxim Integrated): This substitute is optimized for low-voltage applications with a 2.7V to 5.5V supply range. The step-up topology is specifically suited for backlight applications where voltage boost is required. Operating temperature range is limited to -40°C to 85°C, which is 40°C below the primary part's maximum. The 10-uMAX/uSOP package offers the smallest footprint. Dimming capability is not specified in the provided data. This substitute is most appropriate for low-voltage backlight designs within the specified thermal envelope.

Frequently Asked Questions (FAQ)

Q: Can LM3409HVMY/NOPB directly replace MP4655GY-Z in existing designs?

A: Functional replacement is possible provided the application tolerates the topology change from flyback to step-down (buck). The LM3409HVMY/NOPB supports the same dimming methods (analog and PWM) and operates within compatible voltage ranges. However, circuit topology differences require design review and validation. Package differences (10-HVSSOP vs. 28-SOIC) necessitate PCB layout modifications.

Q: What are the voltage range implications when selecting a substitute?

A: The MP4655GY-Z operates from 9V to 35V. LM3409HVMY/NOPB extends this range to 6V to 75V, providing broader application flexibility. LM3423MHX/NOPB offers 4.5V to 75V, the widest range. MAX1698AEUB+ is limited to 2.7V to 5.5V and is suitable only for low-voltage backlight applications. Selection depends on the specific supply voltage requirements of the target application.

Q: How do topology differences affect substitution decisions?

A: The primary part uses flyback topology, which provides galvanic isolation and is suitable for high-voltage applications. Substitute topologies serve different purposes: step-down (buck) reduces voltage efficiently, step-up (boost) increases voltage, and SEPIC handles both step-up and step-down functions. Topology selection must align with the application's voltage conversion requirements and isolation needs.

Q: Are all substitutes suitable for backlight applications?

A: The MP4655GY-Z and MAX1698AEUB+ are explicitly specified for backlight applications. LM3409HVMY/NOPB and LM3423MHX/NOPB do not list specific applications in the provided data but function as LED driver controllers compatible with backlight designs. Application suitability requires validation against specific circuit requirements.

Q: What is the significance of package differences?

A: The primary part uses 28-SOIC (0.295" width), while substitutes employ smaller packages: LM3409HVMY/NOPB uses 10-HVSSOP (0.118" width) and MAX1698AEUB+ uses 10-uMAX/uSOP (0.118" width). Smaller packages reduce board space but require different PCB footprints and assembly considerations. LM3423MHX/NOPB uses 20-HTSSOP (0.173" width), a moderate alternative.

Q: Do all substitutes meet the operating temperature requirement of -40°C to 125°C?

A: MP4655GY-Z, LM3409HVMY/NOPB, and LM3423MHX/NOPB all support -40°C to 125°C operation. MAX1698AEUB+ is limited to -40°C to 85°C, which is 40°C below the primary part's maximum. Applications requiring operation above 85°C must exclude MAX1698AEUB+ from consideration.

Q: What compliance certifications apply to all parts?

A: All four parts (MP4655GY-Z, LM3409HVMY/NOPB, LM3423MHX/NOPB, and MAX1698AEUB+) are ROHS3 compliant and REACH unaffected. All carry EAR99 export classification and HTSUS code 8542.39.0001. All maintain active product status, supporting long-term design continuity.