MPQ3386DR-LF-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MPQ3386DR-LF-Z is a 6-output LED driver IC manufactured by Monolithic Power Systems, designed for backlight applications. This Step-Up (Boost) topology DC DC regulator operates from 4.5V to 25V input and delivers 50V output with PWM dimming capability. The device is packaged in a 24-QFN (4x4) format and is AEC-Q100 qualified for automotive applications, currently in active production status with 1082 units in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter ranges, enabling design flexibility and supply chain alternatives.

Key Parameters

Parameter	MPQ3386DR-LF-Z
Manufacturer	Monolithic Power Systems
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	6
Voltage Supply (Min)	4.5V
Voltage Supply (Max)	25V
Voltage Output	50V
Frequency	1.25MHz
Dimming	PWM
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	24-VFQFN Exposed Pad
Grade	Automotive
Qualification	AEC-Q100
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Topology: Step-Up (Boost) configuration required for 50V output generation from lower input voltages
Number of Outputs: 6 outputs minimum to maintain functional equivalence
Voltage Supply Range: Input range must encompass or exceed 4.5V to 25V specification
Voltage Output: Output voltage capability must support 50V or higher
Dimming Method: PWM dimming required for backlight application compatibility
Package Type: Surface mount QFN packages acceptable for form factor compatibility
Operating Temperature: Extended temperature range (-40°C to 125°C) preferred for automotive-grade applications
Product Status: Active production status ensures availability and long-term support

The following parts meet substitution criteria based on these parameters:

Primary Substitutes (6-Output, Step-Up Boost, PWM Dimming):

TPS61187RTJR (Texas Instruments)
BD9470AEFV-E2 (Rohm Semiconductor)
LP8552TLE-E06/NOPB (Texas Instruments)
LP8552TLE/NOPB (Texas Instruments)
LP8556SQE-E09/NOPB (Texas Instruments)
LT3598IFE#PBF (Analog Devices Inc.)
TPS61182RTET (Texas Instruments)

Secondary Substitutes (Reduced Output Count or Parameter Variance):

AAT3156ISN-T1 (Skyworks Solutions Inc.) – 6 outputs, Switched Capacitor topology, lower voltage output range
LP8556SQ-E08/NOPB (Texas Instruments) – 4 outputs, reduced output count
LP8556TME-E06/NOPB (Texas Instruments) – 5 outputs, reduced output count

Parameter Comparison

Part Number	Manufacturer	Topology	Outputs	V Supply Min	V Supply Max	V Output	Dimming	Temp Range	Package	Status
MPQ3386DR-LF-Z	MPS	Step-Up (Boost)	6	4.5V	25V	50V	PWM	-40°C ~ 125°C	24-VFQFN	Active
TPS61187RTJR	TI	Step-Up (Boost)	6	4.5V	24V	38V	PWM	-40°C ~ 85°C	20-WFQFN	Active
BD9470AEFV-E2	Rohm	Step-Up (Boost)	6	9V	35V	—	PWM	-40°C ~ 85°C	28-VSSOP	Active
LP8552TLE-E06/NOPB	TI	Step-Up (Boost)	6	2.7V	22V	40V	PWM	-40°C ~ 85°C	25-DSBGA	Active
LP8552TLE/NOPB	TI	Step-Up (Boost)	6	2.7V	22V	40V	PWM	-40°C ~ 85°C	25-WFBGA	Active
LP8556SQE-E09/NOPB	TI	Step-Up (Boost)	6	2.7V	20V	7V ~ 43V	PWM	-30°C ~ 85°C	24-WFQFN	Active
LT3598IFE#PBF	ADI	Step-Up (Boost)	6	3V	30V	44V	Analog, PWM	-40°C ~ 125°C	24-TSSOP	Active
TPS61182RTET	TI	Step-Up (Boost)	6	5V	24V	38V	PWM	-40°C ~ 85°C	16-WFQFN	Active
AAT3156ISN-T1	Skyworks	Switched Capacitor (Charge Pump)	6	2.7V	5.5V	2V ~ 4.3V	—	-40°C ~ 85°C	16-TQFN	Active
LP8556SQ-E08/NOPB	TI	Step-Up (Boost)	4	2.7V	20V	7V ~ 43V	PWM	-30°C ~ 85°C	24-WFQFN	Active
LP8556TME-E06/NOPB	TI	Step-Up (Boost)	5	2.7V	20V	7V ~ 43V	PWM	-30°C ~ 85°C	20-WFBGA	Active

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

TPS61187RTJR and LT3598IFE#PBF are the most compatible alternatives. Both maintain 6-output configuration, Step-Up Boost topology, and PWM dimming. TPS61187RTJR operates within the 4.5V to 24V input range with 38V output capability. LT3598IFE#PBF extends the input range to 3V to 30V with 44V output and supports both analog and PWM dimming, maintaining the extended temperature range (-40°C to 125°C) matching the original part's automotive-grade specification.

Qualified Alternatives (Functional Equivalence with Parameter Trade-offs):

LP8552TLE-E06/NOPB and LP8552TLE/NOPB provide 6-output Step-Up Boost regulation with PWM dimming and 40V output capability. Input range extends to 2.7V minimum, though maximum supply voltage is limited to 22V. Both maintain ROHS3 compliance and unlimited moisture sensitivity rating. Package differences (25-DSBGA versus 25-WFBGA) require PCB layout verification.

BD9470AEFV-E2 offers 6-output Step-Up Boost topology with PWM dimming but requires minimum 9V input supply, limiting applicability to higher voltage input designs. Output voltage specification is not provided in available data.

Reduced-Output Alternatives (Application-Dependent):

LP8556SQE-E09/NOPB maintains 6 outputs in a 24-WFQFN package with Step-Up Boost topology and PWM dimming. Input range is 2.7V to 20V with 7V to 43V output capability. Operating temperature range is -30°C to 85°C, which does not extend to -40°C minimum.

LP8556SQ-E08/NOPB and LP8556TME-E06/NOPB provide 4-output and 5-output configurations respectively, suitable only for applications requiring fewer LED driver channels.

Not Recommended for Direct Substitution:

AAT3156ISN-T1 uses Switched Capacitor (Charge Pump) topology with significantly lower output voltage range (2V to 4.3V), incompatible with 50V output requirement. This part is suitable only for low-voltage backlight or camera flash applications.

Frequently Asked Questions (FAQ)

Q: Can TPS61187RTJR replace MPQ3386DR-LF-Z in all applications?

A: TPS61187RTJR is functionally equivalent for most backlight applications. Both are 6-output Step-Up Boost regulators with PWM dimming. The primary difference is output voltage capability: TPS61187RTJR delivers 38V versus MPQ3386DR-LF-Z at 50V. Verify that your application does not require output voltages exceeding 38V. Input supply range is compatible (4.5V to 24V for TPS61187RTJR versus 4.5V to 25V for the original). Operating temperature range differs: TPS61187RTJR is rated to -40°C to 85°C, while MPQ3386DR-LF-Z extends to 125°C. For automotive applications requiring extended temperature operation, LT3598IFE#PBF is preferred.

Q: What is the difference between Step-Up Boost and Switched Capacitor topologies?

A: Step-Up Boost regulators use an inductor-based switching architecture to generate higher output voltages from lower input supplies, suitable for high-voltage applications like 50V LED backlighting. Switched Capacitor (Charge Pump) regulators use capacitive energy transfer and are limited to lower voltage multiplication ratios, typically 2x to 3x input voltage. AAT3156ISN-T1 uses Charge Pump topology and cannot achieve the 50V output required by MPQ3386DR-LF-Z applications.

Q: Are all substitute parts AEC-Q100 qualified?

A: No. MPQ3386DR-LF-Z carries AEC-Q100 automotive qualification. Among the listed substitutes, only LT3598IFE#PBF explicitly maintains automotive-grade operating temperature range (-40°C to 125°C). Other substitutes are rated to -40°C to 85°C or -30°C to 85°C. For automotive applications requiring AEC-Q100 compliance, verify qualification status with the manufacturer before design implementation.

Q: Can I use LP8556SQ-E08/NOPB if my design only requires 4 LED driver outputs?

A: Yes, LP8556SQ-E08/NOPB is suitable for applications requiring 4 independent LED driver outputs. This part maintains Step-Up Boost topology, PWM dimming, and 24-WFQFN package compatibility. Output voltage range is 7V to 43V, which is lower than the original 50V specification. Verify that your application does not require output voltages exceeding 43V.

Q: What package considerations apply when substituting parts?

A: MPQ3386DR-LF-Z uses 24-VFQFN packaging. Substitute parts employ different packages: TPS61187RTJR (20-WFQFN), BD9470AEFV-E2 (28-VSSOP), LP8552 variants (25-DSBGA or 25-WFBGA), LP8556 variants (24-WFQFN or 20-WFBGA), LT3598IFE#PBF (24-TSSOP), and TPS61182RTET (16-WFQFN). Each package has different pin counts, footprints, and thermal characteristics. PCB layout redesign is required for any package change. Verify thermal performance, particularly for high-current applications, as package size affects heat dissipation capability.

Q: Which substitute offers the best thermal performance?

A: Thermal performance depends on package design and internal die characteristics. Larger packages generally provide better thermal dissipation. BD9470AEFV-E2 (28-VSSOP) and LP8552 variants (25-DSBGA/WFBGA) offer larger thermal footprints than the original 24-VFQFN. However, thermal performance specifications are not provided in the available data. Consult detailed datasheets and thermal models from each manufacturer for specific thermal resistance (θJA) values before final selection.

Q: Is moisture sensitivity level (MSL) a critical factor in substitute selection?

A: Yes, for high-reliability applications. MPQ3386DR-LF-Z carries MSL 1 (Unlimited), indicating no moisture sensitivity. Most Texas Instruments substitutes (LP8552, LP8556, TPS61182, TPS61187) also carry MSL 1 or MSL 2 (1 Year). BD9470AEFV-E2 carries MSL 3 (168 Hours), requiring more stringent moisture control during storage and assembly. For applications with extended storage periods or high-humidity environments, prefer parts with MSL 1 or MSL 2 ratings.

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