MP3384LGQ-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP3384LGQ-Z is an active LED Driver IC manufactured by Monolithic Power Systems Inc., classified as a Power Management PMIC. This device functions as a 4-output DC-DC Step-Up (Boost) regulator with PWM dimming capability, designed for backlight applications. The part operates across a 3V to 25V supply range and delivers 30mA per channel output current at up to 50V output voltage. With an operating frequency of 1.25MHz and surface mount packaging in 16-QFN (3x3), this component is ROHS3 compliant and maintains unlimited moisture sensitivity rating (MSL 1). Finding equivalent or substitute parts becomes necessary when addressing supply chain constraints, inventory availability, or specific application requirements that may benefit from alternative electrical or mechanical characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	MP3384LGQ-Z
Manufacturer	Monolithic Power Systems Inc.
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	4
Voltage - Supply (Min)	3V
Voltage - Supply (Max)	25V
Voltage - Output	50V
Current - Output / Channel	30mA
Frequency	1.25MHz
Dimming	PWM
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	16-VFQFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the MP3384LGQ-Z is determined by the following critical parameters: DC-DC regulator topology (Step-Up/Boost), 4-output configuration, PWM dimming capability, surface mount packaging, and ROHS3 compliance. Substitute parts must maintain functional equivalence in backlight LED driver applications while operating within compatible supply voltage ranges and delivering adequate output current per channel.

The substitute parts identified—ADD5207ACPZ-RL, ISL97692IRTZ, LM3639AYFQT, and LP8551TLE/NOPB—share the core architecture of 4-output boost regulators with PWM dimming. However, each presents distinct electrical characteristics that define their substitution scope:

Critical Substitution Parameters:

Topology: Step-Up (Boost) DC-DC Regulator
Output Configuration: 4 independent outputs
Dimming Method: PWM
Applications: Backlight
Compliance: ROHS3 Compliant
Mounting: Surface Mount

Parameter Comparison

Parameter	MP3384LGQ-Z	ADD5207ACPZ-RL	ISL97692IRTZ	LM3639AYFQT	LP8551TLE/NOPB
Manufacturer	Monolithic Power Systems	Analog Devices Inc.	Renesas Electronics	Texas Instruments	Texas Instruments
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)
Number of Outputs	4	4	4	4	4
Voltage - Supply (Min)	3V	6V	2.4V	2.5V	2.7V
Voltage - Supply (Max)	25V	21V	5.5V	5.5V	22V
Voltage - Output	50V	36V	26V	40V	40V
Current - Output / Channel	30mA	25mA	40mA	30mA, 750mA, 1.5A	50mA
Frequency	1.25MHz	1MHz	400kHz ~ 1.5MHz	500kHz, 4MHz	-
Dimming	PWM	PWM	PWM	PWM	PWM
Operating Temperature	-40°C ~ 125°C (TJ)	-25°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-30°C ~ 85°C (TA)
Package / Case	16-VFQFN Exposed Pad	14-WFDFN Exposed Pad, CSP	16-WFQFN Exposed Pad	20-WFBGA, DSBGA	25-WFBGA, DSBGA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All identified substitute parts maintain active product status and ROHS3 compliance, meeting baseline regulatory and supply chain requirements. Selection among these alternatives depends on specific application constraints:

ADD5207ACPZ-RL (Analog Devices Inc.): Suitable for applications requiring reduced output voltage (36V maximum) and lower per-channel current (25mA). Supply voltage range limitation (6V minimum) restricts use in lower-voltage input scenarios compared to the MP3384LGQ-Z.

ISL97692IRTZ (Renesas Electronics Corporation): Appropriate for low-voltage input applications (2.4V minimum supply) with higher per-channel current capability (40mA). Output voltage limitation (26V maximum) restricts high-voltage backlight applications. Operating temperature range (-40°C to 85°C) supports extended cold-temperature operation.

LM3639AYFQT (Texas Instruments): Offers flexible current output options (30mA, 750mA, 1.5A per channel) and dual frequency operation (500kHz, 4MHz), enabling broader application adaptation. Output voltage capability (40V) and supply range (2.5V to 5.5V) suit mid-range backlight designs. MSL 1 rating matches the MP3384LGQ-Z for moisture sensitivity.

LP8551TLE/NOPB (Texas Instruments): Delivers highest per-channel current (50mA) with wide supply voltage range (2.7V to 22V) and 40V output capability. Suitable for high-brightness backlight applications requiring maximum current delivery. MSL 1 rating provides equivalent moisture handling to the original part.

Frequently Asked Questions (FAQ)

Q: Can ADD5207ACPZ-RL directly replace MP3384LGQ-Z in all applications?

A: ADD5207ACPZ-RL shares the 4-output boost regulator topology and PWM dimming architecture. However, the 6V minimum supply voltage excludes applications requiring 3V to 5.9V input operation. The 36V maximum output voltage limits use in designs requiring the full 50V capability of the MP3384LGQ-Z. Package differences (14-LFCSP versus 16-QFN) require PCB layout modification.

Q: What are the key differences between ISL97692IRTZ and MP3384LGQ-Z?

A: ISL97692IRTZ operates at lower supply voltages (2.4V minimum) and delivers higher per-channel current (40mA versus 30mA). Output voltage is limited to 26V, restricting applications requiring higher boost ratios. The 16-TQFN package matches the QFN form factor of the MP3384LGQ-Z, simplifying board-level integration. Operating temperature range (-40°C to 85°C) is narrower than the MP3384LGQ-Z (-40°C to 125°C).

Q: Is LM3639AYFQT suitable for variable current backlight designs?

A: LM3639AYFQT supports multiple current output levels (30mA, 750mA, 1.5A per channel) and dual frequency operation (500kHz, 4MHz), enabling flexible backlight brightness control. The 20-DSBGA package differs from the 16-QFN of the MP3384LGQ-Z, requiring different PCB footprint and assembly considerations. MSL 1 rating provides equivalent moisture protection.

Q: What advantage does LP8551TLE/NOPB offer for high-brightness applications?

A: LP8551TLE/NOPB delivers 50mA per channel, the highest among substitute options, supporting brighter LED backlight designs. The 2.7V to 22V supply range accommodates diverse input voltage scenarios. The 25-DSBGA package requires different assembly and thermal management compared to the 16-QFN form factor. MSL 1 rating matches the original part's moisture sensitivity specification.

Q: Are package differences between substitutes critical for PCB redesign?

A: Package differences require PCB layout modification. MP3384LGQ-Z uses 16-QFN (3x3), ADD5207ACPZ-RL uses 14-LFCSP (4x3), ISL97692IRTZ uses 16-TQFN (3x3), LM3639AYFQT uses 20-DSBGA (2.04x1.78), and LP8551TLE/NOPB uses 25-DSBGA. ISL97692IRTZ maintains closest physical compatibility with the original 16-QFN package. Other substitutes necessitate footprint redesign and potential thermal management adjustments.

Q: Which substitute part best matches the MP3384LGQ-Z operating temperature range?

A: The MP3384LGQ-Z operates from -40°C to 125°C (junction temperature). All substitute parts operate to maximum 85°C ambient temperature, representing a narrower range. For applications requiring the full -40°C to 125°C performance envelope, the MP3384LGQ-Z remains the only option among these substitutes.

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