MP4601EF-LF LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP4601EF-LF is an active 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) topology, featuring analog and PWM dimming capabilities for backlight applications. The part operates with a 2.5A internal switch at 280kHz switching frequency and supports input voltage ranges from 4.5V to 75V. With active product status and ROHS3 compliance, the MP4601EF-LF is suitable for current production designs. Equivalent and substitute parts are identified when they meet the core electrical and mechanical parameters required for LED driver functionality in backlight applications, including topology compatibility, switching current capacity, voltage operating ranges, and dimming control methods.

Key Parameters

Parameter	MP4601EF-LF
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
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MP4601EF-LF are grouped based on functional equivalence within the LED driver IC category. The primary substitution criteria are:

Core Electrical Parameters:

DC DC Regulator topology (Step-Down, Step-Up, or combined)
Single output configuration
Switching current capacity (minimum 1.0A, nominal 1.5A to 2.8A)
Input voltage range overlap (minimum 2.5V to 4.5V, maximum 12V to 75V)
Dimming control method (Analog, PWM, or both)
Backlight or lighting application suitability

Mechanical & Compliance Parameters:

Surface mount packaging
Active product status
ROHS3 compliance
Operating temperature range (-40°C to 125°C preferred for extended reliability)

Substitutes are organized into two functional groups: (1) Direct topology matches with dual Buck-Boost capability, and (2) Single-topology alternatives (Buck or Boost) that provide equivalent LED driver functionality within specified voltage and current constraints.

Parameter Comparison

Part Number	Manufacturer	Topology	Supply Min (V)	Supply Max (V)	Current (A)	Frequency (kHz)	Dimming	Package	Temp Range (°C)
MP4601EF-LF	Monolithic Power Systems	Buck, Boost	4.5	75	2.5	280	Analog, PWM	16-TSSOP-EP	-20 to 85
LT3517EUF#PBF	Analog Devices Inc.	Buck, Boost	3	30	1.5	250-2500	Analog, PWM	16-QFN (4x4)	-40 to 125
NCV3065MNTXG	onsemi	Buck, Boost	3	40	1.5	150	Analog, PWM	8-DFN (4x4)	-40 to 125
LM3410XMFX/NOPB	Texas Instruments	SEPIC, Boost	2.7	5.5	2.8	1600	PWM	SOT-23-5	-40 to 125
LM3414HVMR/NOPB	Texas Instruments	Buck	4.5	65	1	500	Analog, PWM	8-SO PowerPad	-40 to 125
LT3491EDC#TRPBF	Analog Devices Inc.	Boost	2.5	12	0.26	2300	PWM	6-DFN (2x2)	-40 to 85
LT3491ESC8#TRPBF	Analog Devices Inc.	Boost	2.5	12	0.35	2300	PWM	SC-70-8	-40 to 85
MIC3287YD5-TR	Microchip Technology	Boost	2.8	6.5	0.35	1200	Analog, PWM	TSOT-23-5	-40 to 125
RT8453BGSP	Richtek USA Inc.	Buck	4.5	40	1.5	500	Analog, PWM	8-SOP-EP	-40 to 125
TPS611781RNWR	Texas Instruments	Boost	2.7	20	10	2200	N/A	13-PowerVFQFN	-40 to 125

Engineering Selection Recommendations

Direct Equivalents (Dual Topology - Buck & Boost):

LT3517EUF#PBF and NCV3065MNTXG provide the closest functional equivalence to MP4601EF-LF, both supporting combined Step-Down and Step-Up topologies with analog and PWM dimming. LT3517EUF#PBF offers superior frequency range (250kHz to 2.5MHz) and higher maximum supply voltage (30V), making it suitable for applications requiring topology flexibility. NCV3065MNTXG provides lower frequency operation (150kHz) with equivalent current handling (1.5A) and extended temperature range (-40°C to 125°C). Both parts are ROHS3 compliant with active product status.

Single-Topology Alternatives:

For applications requiring only Step-Down (Buck) regulation, LM3414HVMR/NOPB and RT8453BGSP are suitable. LM3414HVMR/NOPB is automotive-grade with 1A switching current and 500kHz operation. RT8453BGSP provides 1.5A switching current at 500kHz with extended temperature range.

For Step-Up (Boost) only applications, LM3410XMFX/NOPB offers 2.8A switching current with PWM dimming, though limited to 5.5V maximum supply. LT3491 variants (EDC and ESC8) provide compact boost regulation with PWM dimming but reduced current capacity (260mA to 350mA), suitable for lower-power backlight applications.

High-Current Boost Alternative:

TPS611781RNWR provides 10A switching current for boost applications requiring significantly higher power delivery, though it lacks dimming control and operates at higher frequency (2.2MHz).

All recommended substitutes maintain ROHS3 compliance and active product status. Selection should prioritize topology match, voltage range compatibility, and current capacity requirements for the target application.

Frequently Asked Questions (FAQ)

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

A: LT3517EUF#PBF provides equivalent dual Buck-Boost topology and dimming capability. However, the package differs (16-QFN vs. 16-TSSOP), requiring PCB layout modification. Verify that the 3V to 30V supply range and 1.5A current capacity meet application requirements. The extended frequency range (250kHz to 2.5MHz) may require output filter recalculation.

Q: What is the primary difference between MP4601EF-LF and LM3414HVMR/NOPB?

A: MP4601EF-LF supports both Buck and Boost topologies with 2.5A current capacity and 4.5V to 75V supply range. LM3414HVMR/NOPB is Buck-only with 1A current capacity and 4.5V to 65V supply range. LM3414HVMR/NOPB is suitable only for step-down applications and lower current requirements.

Q: Are LT3491 variants suitable for high-current backlight applications?

A: LT3491EDC#TRPBF and LT3491ESC8#TRPBF are Boost-only regulators with reduced switching current (260mA to 350mA) compared to MP4601EF-LF (2.5A). These parts are suitable for low-power backlight applications only. For applications requiring 2.5A or higher current, select LT3517EUF#PBF, NCV3065MNTXG, or RT8453BGSP.

Q: Does package type affect substitution compatibility?

A: Yes. MP4601EF-LF uses 16-TSSOP-EP packaging. Substitutes with different packages (SOT-23-5, 8-DFN, 8-SOP-EP, 16-QFN) require PCB redesign. Verify footprint compatibility and thermal management requirements before substitution. Exposed pad packages (EP) provide improved thermal performance compared to non-exposed variants.

Q: Which substitute offers the widest input voltage range?

A: MP4601EF-LF supports 4.5V to 75V input. LT3517EUF#PBF supports 3V to 30V, and NCV3065MNTXG supports 3V to 40V. For applications exceeding 40V input, MP4601EF-LF remains the only option among listed substitutes.

Q: Can TPS611781RNWR replace MP4601EF-LF?

A: TPS611781RNWR is a Boost-only regulator with 10A switching current, suitable only for step-up applications. It lacks dimming control and operates at 2.2MHz. This part is not a general substitute but rather a high-current alternative for boost-only designs.

Q: What is the significance of operating temperature range in substitution?

A: MP4601EF-LF operates -20°C to 85°C. Most substitutes extend to -40°C to 125°C, providing wider environmental tolerance. For applications within -20°C to 85°C, both MP4601EF-LF and extended-range substitutes are acceptable. For applications below -20°C or above 85°C, extended-range parts are required.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and active product status, meeting current regulatory requirements for electronic component procurement.

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