MP4601ES-LF-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP4601ES-LF-Z is a LED Driver IC manufactured by Monolithic Power Systems Inc., classified as a Power Management PMIC. This device functions as a 1-output DC DC regulator with integrated Step-Down (Buck) and Step-Up (Boost) topologies, delivering 2.5A switch current with Analog and PWM dimming capabilities for backlight applications. The part is currently marked as Not For New Designs, making identification of active equivalent and substitute components essential for ongoing production support and design continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	MP4601ES-LF-Z
Manufacturer	Monolithic Power Systems Inc.
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Down (Buck), Step-Up (Boost)
Number of Outputs	1
Voltage Supply Range	4.5V to 75V
Current Output / Channel	2.5A (Switch)
Frequency	280kHz
Dimming	Analog, PWM
Package / Case	16-SOIC (0.154", 3.90mm Width)
Operating Temperature	-20°C to 85°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	2 (1 Year)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitute parts for the MP4601ES-LF-Z are categorized based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Topology: Step-Down (Buck), Step-Up (Boost) capability
Number of Outputs: 1 output configuration
Current Rating: 2.5A or higher switch current
Voltage Supply Range: Minimum 4.5V input support
Dimming Capability: Analog and/or PWM dimming support
Package Type: 16-pin surface mount packages (SOIC, TSSOP, QFN)
Applications: Backlight and lighting use cases

Grouping Categories:

Group 1 - Parametric Equivalents (Monolithic Power Systems): MP4603EF-LF-Z and MP4603ES-LF-Z maintain identical topology, output count, current rating, and dimming capabilities with enhanced voltage supply range (80V maximum) and active product status.

Group 2 - Manufacturer Recommended Alternatives (Analog Devices / Maxim): LT3478IFE-1#TRPBF and LT3518EUF#TRPBF provide Step-Down/Step-Up topology with comparable or superior current ratings and extended operating temperature ranges, packaged in 16-pin configurations.

Group 3 - Specialized Topology Alternatives: AP5724FDCG-7 (Diodes), LTC3215EDD#PBF (Analog Devices), and MAX1848ETA+T (Maxim) offer reduced current ratings or alternative topologies (Boost-only, Charge Pump) suitable for lower-power backlight applications.

Group 4 - Reduced Current Alternatives: NCP3066DR2G (onsemi) and MAX20051AUD/V+T (Maxim) provide lower current ratings (1.5A to 2A) with maintained topology flexibility for applications with reduced power requirements.

Parameter Comparison

Part Number	Manufacturer	Topology	Current (A)	Voltage Supply (Min-Max)	Frequency	Dimming	Package	Temp Range	Status
MP4601ES-LF-Z	MPS	Buck/Boost	2.5	4.5V-75V	280kHz	Analog, PWM	16-SOIC	-20 to 85°C	Not For New Designs
MP4603EF-LF-Z	MPS	Buck/Boost	2.5	4.5V-80V	280kHz	Analog, PWM	16-SOIC	-20 to 85°C	Active
MP4603ES-LF-Z	MPS	Buck/Boost	2.5	4.5V-80V	280kHz	Analog, PWM	16-SOIC	-20 to 85°C	Active
LT3478IFE-1#TRPBF	Analog Devices	Buck/Boost	4.5	2.8V-36V	200kHz-2.25MHz	PWM	16-TSSOP-EP	-40 to 125°C	Active
LT3518EUF#TRPBF	Analog Devices	Buck/Boost	2.3	3V-30V	250kHz-2.5MHz	Analog, PWM	16-QFN	-40 to 125°C	Active
LT3518HUF#PBF	Analog Devices	Buck/Boost	2.3	3V-30V	250kHz-2.5MHz	Analog, PWM	16-QFN	-40 to 150°C	Active
AP5724FDCG-7	Diodes Inc.	Boost	0.75	2.7V-5.5V	1.2MHz	PWM	6-UDFN	-40 to 85°C	Active
LTC3215EDD#PBF	Analog Devices	Charge Pump	0.7	2.9V-4.4V	900kHz	-	10-DFN	-40 to 85°C	Active
MAX1848ETA+T	Maxim Integrated	Boost	0.75	2.6V-5.5V	1.2MHz	-	8-TDFN	-40 to 85°C	Active
MAX20051AUD/V+T	Maxim Integrated	Buck	2.0	4.5V-65V	400kHz	Analog, PWM	14-TSSOP-EP	-40 to 125°C	Active
NCP3066DR2G	onsemi	Buck/Boost	1.5	3V-40V	150kHz	Analog, PWM	8-SOIC	0 to 85°C	Active

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): MP4603EF-LF-Z and MP4603ES-LF-Z are the primary substitutes for MP4601ES-LF-Z. Both maintain identical electrical specifications (2.5A current, 280kHz frequency, Analog/PWM dimming) and package configuration (16-SOIC). The MP4603 series offers extended maximum supply voltage (80V vs. 75V) and active product status, ensuring long-term availability and manufacturing support. Both parts are ROHS3 compliant and carry identical REACH and ECCN classifications.

Secondary Alternatives (Topology-Matched): LT3478IFE-1#TRPBF and LT3518EUF#TRPBF from Analog Devices provide Buck/Boost topology with active status. LT3478IFE-1#TRPBF delivers superior current capability (4.5A) with extended temperature range (-40 to 125°C), though it operates at lower maximum supply voltage (36V). LT3518EUF#TRPBF and LT3518HUF#PBF maintain Analog/PWM dimming with comparable current (2.3A) and extended operating temperatures, suitable for industrial applications requiring -40 to 125°C or -40 to 150°C operation.

Specialized Application Alternatives: MAX20051AUD/V+T provides Step-Down topology with 2A current and extended supply voltage range (4.5V-65V), suitable for applications where Boost functionality is not required. NCP3066DR2G offers reduced current (1.5A) in compact 8-SOIC packaging for lower-power backlight designs. AP5724FDCG-7, LTC3215EDD#PBF, and MAX1848ETA+T are suitable only for applications with reduced current requirements (0.7A-0.75A) and lower supply voltages.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original MP4601ES-LF-Z specification.

Frequently Asked Questions (FAQ)

Q: Can MP4603EF-LF-Z and MP4603ES-LF-Z be used as direct drop-in replacements for MP4601ES-LF-Z?

A: Yes. Both MP4603 variants maintain identical topology (Buck/Boost), current rating (2.5A), frequency (280kHz), dimming capability (Analog/PWM), and package configuration (16-SOIC). The primary differences are enhanced maximum supply voltage (80V vs. 75V) and active product status. PCB layout and firmware remain compatible without modification.

Q: What is the key difference between MP4603EF-LF-Z and MP4603ES-LF-Z?

A: Both parts are functionally equivalent with identical electrical specifications. The difference lies in packaging format: MP4603EF-LF-Z is supplied in Cut Tape & Digi-Reel format, while MP4603ES-LF-Z is supplied in Tape & Reel format. Selection depends on procurement and assembly requirements.

Q: Why would LT3478IFE-1#TRPBF be preferred over MP4603 variants despite higher current rating?

A: LT3478IFE-1#TRPBF offers superior current capability (4.5A vs. 2.5A) and extended operating temperature range (-40 to 125°C vs. -20 to 85°C), making it suitable for industrial and automotive applications. However, it operates at lower maximum supply voltage (36V vs. 80V) and uses 16-TSSOP-EP packaging instead of 16-SOIC, requiring PCB layout modifications.

Q: Can MAX20051AUD/V+T replace MP4601ES-LF-Z in all applications?

A: No. MAX20051AUD/V+T provides only Step-Down (Buck) topology, eliminating Boost capability. It is suitable only for applications requiring Buck regulation exclusively. The part maintains comparable current (2A vs. 2.5A) and Analog/PWM dimming, but PCB redesign is necessary due to different package (14-TSSOP-EP vs. 16-SOIC).

Q: What are the limitations of NCP3066DR2G as a substitute?

A: NCP3066DR2G operates at reduced current (1.5A vs. 2.5A) and lower maximum supply voltage (40V vs. 75V). It uses 8-SOIC packaging instead of 16-SOIC and operates at lower frequency (150kHz vs. 280kHz). Operating temperature range is also restricted (0 to 85°C vs. -20 to 85°C). This part is suitable only for lower-power backlight applications.

Q: Are AP5724FDCG-7, LTC3215EDD#PBF, and MAX1848ETA+T viable substitutes?

A: These parts are suitable only for specialized low-power applications. AP5724FDCG-7 and MAX1848ETA+T provide Boost-only topology at 750mA current, while LTC3215EDD#PBF uses Charge Pump topology at 700mA. All three are unsuitable for applications requiring 2.5A current or Buck/Boost flexibility. They are recommended only when backlight power requirements are significantly reduced.

Q: Do all substitute parts maintain the same compliance certifications as MP4601ES-LF-Z?

A: Yes. All recommended substitutes are ROHS3 compliant and REACH unaffected, matching the original part's regulatory status. Moisture Sensitivity Level (MSL) varies: MP4603 variants maintain MSL 2, while Analog Devices and Maxim parts typically carry MSL 1 (Unlimited), providing superior shelf-life characteristics.

Q: What packaging considerations apply when selecting substitutes?

A: MP4603EF-LF-Z and MP4603ES-LF-Z maintain 16-SOIC packaging, requiring no PCB modifications. LT3478IFE-1#TRPBF and LT3518 variants use 16-TSSOP-EP and 16-QFN packages respectively, requiring PCB layout redesign. Smaller packages (AP5724FDCG-7, LTC3215EDD#PBF, MAX1848ETA+T) necessitate significant board-level modifications. Package selection directly impacts assembly compatibility and thermal management.

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