MP4601EF-LF-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP4601EF-LF-Z is a LED Driver IC manufactured by Monolithic Power Systems Inc., classified as a Power Management PMIC. This device integrates a 1-output DC-DC regulator with step-down (buck) and step-up (boost) topology, featuring PWM and analog dimming capabilities for backlight applications. The part operates with a 2.5A internal switch and supports a wide supply voltage range of 4.5V to 75V.

The MP4601EF-LF-Z carries a "Not For New Designs" product status, indicating it is no longer recommended for new development. This status necessitates identification of functionally equivalent alternatives that maintain compatibility with existing designs while offering active product support and extended lifecycle availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	MP4601EF-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 (Min)	4.5V
Voltage - Supply (Max)	75V
Current - Output / Channel	2.5A (Switch)
Frequency	280kHz
Dimming	Analog, PWM
Applications	Backlight
Operating Temperature	-20°C ~ 85°C (TA)
Package / Case	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
RoHS Status	ROHS3 Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution of the MP4601EF-LF-Z requires matching the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Topology: Step-Down (Buck), Step-Up (Boost) dual-mode capability
Dimming Support: Analog and PWM dimming functionality
Supply Voltage Range: Minimum 4.5V input, maximum ≥75V input
Output Current: ≥2.5A switch current capability
Single Output Configuration
Surface Mount Packaging with Exposed Pad

Secondary Compatibility Factors:

Operating Temperature Range: -20°C minimum to 85°C maximum
Frequency: 280kHz nominal operation
Application: Backlight LED driver functionality
RoHS3 Compliance and regulatory alignment

The substitute parts identified below are grouped based on topology compatibility and electrical parameter alignment. Parts with identical dual-mode (buck-boost) topology and matching dimming capabilities represent direct functional equivalents. Parts with single-mode topology (buck-only or boost-only) or reduced current ratings represent functional alternatives suitable for specific application subsets.

Parameter Comparison

Parameter	MP4601EF-LF-Z	LM3414SD/NOPB	LT3477EUF#TRPBF	LT3517EUF#TRPBF	TPS61161DRVR	XRP7613IDBTR-F
Manufacturer	MPS	Texas Instruments	Analog Devices	Analog Devices	Texas Instruments	MaxLinear
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator
Topology	Buck, Boost	Buck	Flyback, SEPIC, Buck, Boost	Buck, Boost	Boost	Buck
Number of Outputs	1	1	1	1	1	1
Voltage - Supply (Min)	4.5V	4.5V	2.5V	3V	2.7V	7V
Voltage - Supply (Max)	75V	42V	25V	30V	18V	36V
Current - Output / Channel	2.5A	1A	3A	1.5A	700mA	1.2A
Frequency	280kHz	500kHz	200kHz ~ 4.6MHz	250kHz ~ 2.5MHz	600kHz	1MHz
Dimming	Analog, PWM	Analog, PWM	PWM	Analog, PWM	PWM	Analog, PWM
Applications	Backlight	Lighting	-	Backlight	Backlight	Lighting
Operating Temperature	-20°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Package / Case	16-TSSOP Exposed Pad	8-WFDFN Exposed Pad	20-WFQFN Exposed Pad	16-WQFN Exposed Pad	6-WDFN Exposed Pad	8-SOIC Exposed Pad
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Product Status	Not For New Designs	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Functional Equivalents (Dual-Mode Buck-Boost with Analog/PWM Dimming):

LT3517EUF#TRPBF represents the closest functional equivalent to the MP4601EF-LF-Z. Both devices feature dual-mode buck-boost topology with combined analog and PWM dimming support. The LT3517 operates across 3V to 30V input range with 1.5A switch current, supporting backlight applications. Operating temperature extends to 125°C junction temperature, providing enhanced thermal margin. The device is in active product status with unlimited moisture sensitivity rating, ensuring long-term availability and supply chain stability.

LT3477EUF#TRPBF offers extended topology flexibility with flyback and SEPIC modes in addition to buck-boost operation. This device supports 3A switch current, exceeding the MP4601EF-LF-Z specification. However, the input voltage range (2.5V to 25V) does not accommodate the full 75V maximum of the original part. This substitute is suitable for applications where the 75V upper limit is not required.

Single-Mode Alternatives (Buck-Only with Analog/PWM Dimming):

LM3414SD/NOPB provides buck-only topology with analog and PWM dimming. Operating range of 4.5V to 42V matches the lower end of the MP4601EF-LF-Z specification but does not extend to 75V. The 1A switch current is reduced compared to the original 2.5A. This device is in active status with automotive-grade qualification and extended operating temperature to 125°C junction temperature.

XRP7613IDBTR-F operates as a buck-only regulator with analog and PWM dimming across 7V to 36V input range. The 1.2A switch current is below the original specification. This device is suitable for applications where boost functionality is not required and input voltage remains above 7V.

Boost-Only Alternative (PWM Dimming):

TPS61161DRVR provides boost-only topology with PWM dimming across 2.7V to 18V input range. The 700mA switch current and 38V output voltage are specified. This device is in active status and suitable for applications requiring step-up conversion only.

Compliance and Lifecycle Considerations:

All recommended substitutes maintain ROHS3 compliance and carry active product status, ensuring regulatory alignment and extended lifecycle support. The MP4601EF-LF-Z "Not For New Designs" status indicates end-of-life trajectory; migration to active alternatives is recommended for new development programs.

Frequently Asked Questions (FAQ)

Q: Can LT3517EUF#TRPBF directly replace MP4601EF-LF-Z in existing designs?

A: LT3517EUF#TRPBF provides functional equivalence in topology (buck-boost), dimming capability (analog and PWM), and single-output configuration. However, the input voltage range differs: LT3517 operates 3V to 30V versus MP4601EF-LF-Z at 4.5V to 75V. Direct substitution is valid only if the application input voltage does not exceed 30V. Package footprints differ (16-QFN versus 16-TSSOP), requiring PCB layout modification.

Q: Why does LM3414SD/NOPB show reduced current rating compared to MP4601EF-LF-Z?

A: LM3414SD/NOPB is specified at 1A switch current versus 2.5A for the MP4601EF-LF-Z. This device is suitable for applications requiring lower output current. Applications demanding the full 2.5A capability require alternative parts such as LT3477EUF#TRPBF (3A) or LT3517EUF#TRPBF (1.5A).

Q: What is the impact of package differences between substitute parts?

A: The MP4601EF-LF-Z uses 16-TSSOP packaging. Substitute parts employ different packages: LT3517 uses 16-QFN, LM3414 uses 8-WSON, TPS61161 uses 6-WSON, and XRP7613 uses 8-SOIC. Package changes require PCB redesign including footprint modification, trace routing adjustment, and thermal management evaluation. Pin count and pinout differ across packages; schematic review is mandatory.

Q: Are all substitute parts suitable for backlight applications?

A: LT3517EUF#TRPBF, TPS61161DRVR, and MCP1643T-I/MS are explicitly specified for backlight applications. LM3414SD/NOPB and XRP7613IDBTR-F are specified for general lighting applications. LT3477EUF#TRPBF does not specify application category. Backlight-specific parts are recommended for LED backlight driver implementations.

Q: What is the significance of "Not For New Designs" status on MP4601EF-LF-Z?

A: This status indicates the manufacturer no longer recommends the part for new product development. Existing inventory may remain available, but long-term supply is not guaranteed. All identified substitutes carry "Active" product status, ensuring continued manufacturing, support, and supply chain availability for new designs.

Q: How do dimming capability differences affect substitution?

A: MP4601EF-LF-Z supports both analog and PWM dimming. LT3517EUF#TRPBF and LM3414SD/NOPB maintain both dimming modes. TPS61161DRVR and MCP1643T-I/MS support PWM dimming only. Applications requiring analog dimming control must use parts supporting both modes. PWM-only parts are suitable for applications using PWM dimming exclusively.

Q: What thermal considerations apply when selecting substitutes?

A: MP4601EF-LF-Z operates -20°C to 85°C (ambient). LT3517EUF#TRPBF and LM3414SD/NOPB extend to 125°C junction temperature, providing enhanced thermal margin. TPS61161DRVR, LT3477EUF#TRPBF, and XRP7613IDBTR-F operate to 85°C ambient. Applications in elevated temperature environments benefit from parts with extended temperature ratings.

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