MP46885DN-LF LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP46885DN-LF is an active LED driver IC manufactured by Monolithic Power Systems Inc., designed for step-down (buck) topology DC-DC regulation with PWM dimming capability. This single-output regulator operates across a 4.5V to 80V supply range and delivers 500mA output current, making it suitable for automotive-grade lighting applications. The part is housed in an 8-SOIC package with exposed pad and maintains ROHS3 compliance with AEC automotive qualification. Substitute parts are identified when equivalent electrical performance, dimming functionality, and package compatibility can be achieved within the specified parameter ranges.

Key Parameters

Parameter	Value
Manufacturer	Monolithic Power Systems Inc.
Part Number	MP46885DN-LF
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage Supply Range	4.5V to 80V
Output Current	500mA
Switching Frequency	2MHz
Dimming Method	PWM
Package Type	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Grade	Automotive
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the MP46885DN-LF are selected based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Topology: Step-Down (Buck) DC-DC regulator with internal switch
Single output configuration
Supply voltage range compatibility (minimum 4.5V input)
Output current capability (500mA or greater)
PWM dimming support
Surface mount package with exposed pad
Automotive-grade qualification or equivalent reliability
ROHS3 compliance

Secondary Compatibility Factors:

Operating temperature range (-40°C minimum)
Switching frequency (1MHz to 2.3MHz acceptable range)
Package footprint compatibility (8-pin or 16-pin surface mount)
Moisture sensitivity level (MSL 1-3 acceptable)

Substitutes are grouped into two categories: direct pin-compatible replacements in 8-pin packages (LM3402HVMMX/NOPB, LM3414HVSD/NOPB, AP8801SG-13) and higher-current alternatives in larger packages (A6216KLPTR-T, AL8861MP-13) that provide enhanced performance margins for demanding lighting applications.

Parameter Comparison

Part Number	Manufacturer	Topology	Supply Voltage (Min-Max)	Output Current	Dimming	Frequency	Package	Status
MP46885DN-LF	Monolithic Power Systems	Step-Down (Buck)	4.5V - 80V	500mA	PWM	2MHz	8-SOIC	Active
LM3402HVMMX/NOPB	Texas Instruments	Step-Down (Buck)	6V - 75V	500mA	PWM	1MHz	8-VSSOP	Active
LM3414HVSD/NOPB	Texas Instruments	Step-Down (Buck)	4.5V - 65V	1A	Analog, PWM	500kHz	8-WSON	Active
LM3405AXMK/NOPB	Texas Instruments	Step-Down (Buck)	3V - 22V	1A	PWM	1.6MHz	TSOT-23-6	Active
A6216KLPTR-T	Allegro MicroSystems	Step-Down (Buck)	4.5V - 55V	2A	Analog, PWM	—	16-eTSSOP-EP	Active
AL8861MP-13	Diodes Incorporated	Step-Down (Buck)	4.5V - 40V	1.5A	Analog, PWM	1MHz	8-MSOP-EP	Active
AP8801SG-13	Diodes Incorporated	Step-Down (Buck)	8V - 48V	500mA	Analog, PWM	625kHz	8-SOIC	Not For New Designs

Engineering Selection Recommendations

Direct Substitutes (Recommended for New Designs):

LM3402HVMMX/NOPB and LM3414HVSD/NOPB are the primary recommended substitutes. Both are active Texas Instruments products with automotive-grade qualification. LM3402HVMMX/NOPB maintains identical 500mA output current and PWM dimming, with supply voltage range of 6V to 75V, making it suitable for applications where minimum input voltage is 6V or higher. LM3414HVSD/NOPB provides enhanced 1A output current capability with extended dimming options (Analog and PWM), operating from 4.5V minimum input, and is housed in an 8-WSON package with automotive qualification.

Higher-Current Alternatives:

A6216KLPTR-T (Allegro MicroSystems) and AL8861MP-13 (Diodes Incorporated) are suitable for applications requiring higher output current margins. A6216KLPTR-T delivers 2A output current in a 16-eTSSOP package with AEC-Q100 qualification. AL8861MP-13 provides 1.5A output current in an 8-MSOP package with extended operating temperature range (-40°C to 85°C). Both support analog and PWM dimming.

Legacy Consideration:

AP8801SG-13 (Diodes Incorporated) is marked "Not For New Designs" and should be avoided for new product development, despite matching the 500mA output current and 8-SOIC package footprint.

Voltage Range Limitation:

LM3405AXMK/NOPB operates only to 22V maximum supply voltage and is suitable only for low-voltage lighting applications, not as a general substitute for the MP46885DN-LF's 80V capability.

Frequently Asked Questions (FAQ)

Q: Can LM3402HVMMX/NOPB directly replace MP46885DN-LF in existing designs?

A: LM3402HVMMX/NOPB is electrically compatible for applications where minimum input voltage is 6V or higher. The MP46885DN-LF operates from 4.5V minimum, so substitution is valid only if your circuit design does not require operation below 6V input. Both devices deliver 500mA output current with PWM dimming and are housed in 8-pin surface mount packages. Package footprints differ (8-VSSOP vs. 8-SOIC), requiring PCB layout verification.

Q: What is the key difference between LM3414HVSD/NOPB and LM3402HVMMX/NOPB?

A: LM3414HVSD/NOPB provides 1A output current versus LM3402HVMMX/NOPB's 500mA, and supports both analog and PWM dimming methods. LM3414HVSD/NOPB operates from 4.5V minimum input (matching MP46885DN-LF), while LM3402HVMMX/NOPB requires 6V minimum. LM3414HVSD/NOPB is packaged in 8-WSON (3x3mm), a smaller footprint than 8-SOIC.

Q: When should I use A6216KLPTR-T instead of the direct substitutes?

A: A6216KLPTR-T is selected for applications requiring higher output current (2A) or when operating voltage is limited to 55V maximum. The 16-eTSSOP package is larger than 8-pin alternatives, requiring different PCB layout. A6216KLPTR-T includes AEC-Q100 automotive qualification and supports both analog and PWM dimming.

Q: Is LM3405AXMK/NOPB suitable as a substitute?

A: LM3405AXMK/NOPB is not a general substitute due to its 22V maximum supply voltage limitation. It is suitable only for low-voltage lighting applications (3V to 22V input range). The MP46885DN-LF's 80V capability cannot be replicated with this part.

Q: Why is AP8801SG-13 listed if it is marked "Not For New Designs"?

A: AP8801SG-13 is included for reference in legacy product support scenarios only. For new designs, select from active products: LM3402HVMMX/NOPB, LM3414HVSD/NOPB, A6216KLPTR-T, or AL8861MP-13.

Q: What package compatibility issues should I verify?

A: MP46885DN-LF uses 8-SOIC (0.154", 3.90mm width). LM3402HVMMX/NOPB uses 8-VSSOP, LM3414HVSD/NOPB uses 8-WSON (3x3), and LM3405AXMK/NOPB uses TSOT-23-6. Each package has different pin spacing and footprint dimensions. PCB layout and schematic verification are required before substitution. A6216KLPTR-T and AL8861MP-13 use larger packages (16-eTSSOP and 8-MSOP respectively) and are not pin-compatible.

Q: Are all substitutes ROHS3 compliant and automotive-grade?

A: All listed substitutes are ROHS3 compliant. Automotive-grade qualification is confirmed for LM3402HVMMX/NOPB, LM3414HVSD/NOPB, A6216KLPTR-T (AEC-Q100), and AP8801SG-13. AL8861MP-13 and LM3405AXMK/NOPB do not specify automotive grade in the provided data.

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