MP3384EQ-LF-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP3384EQ-LF-Z is a 4-output LED driver IC with integrated DC-DC step-up (boost) regulator topology, designed for backlight applications. This device operates from 4.5V to 25V input and delivers up to 50V output with 40mA per channel using PWM dimming control. The part is classified as "Not For New Designs," making identification of equivalent and substitute components essential for ongoing production support, legacy system maintenance, and design flexibility.

Key Parameters

Parameter	Value
Manufacturer Part Number	MP3384EQ-LF-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)	4.5V
Voltage - Supply (Max)	25V
Voltage - Output	50V
Current - Output / Channel	40mA
Frequency	1.25MHz
Dimming Control	PWM
Package / Case	16-VFQFN Exposed Pad
Supplier Device Package	16-QFN (3x3)
Operating Temperature	-40°C ~ 125°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitution eligibility for the MP3384EQ-LF-Z is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: Step-Up (Boost) regulator with 4 outputs
Dimming Control: PWM capability
Input Voltage Range: Minimum 4.5V, Maximum 25V
Output Voltage: 50V or higher
Output Current per Channel: 40mA or higher
Package Compatibility: 16-pin QFN form factor (3x3mm)
Operating Temperature Range: -40°C to 125°C or equivalent

Secondary Considerations:

Switching Frequency: 1.25MHz nominal (tolerance range acceptable)
Internal Switch Integration: Required
RoHS3 Compliance: Required for regulatory alignment

Substitutes are grouped into two categories: parametric equivalents (identical electrical and mechanical specifications with different packaging variants) and manufacturer-recommended alternatives (functionally compatible with acceptable parameter variations).

Parameter Comparison

Parameter	MP3384EQ-LF-Z	MP3384EQ-LF-P	ISL97684IRTZ-T	LT3599EUH#PBF	ADP5520ACPZ-R7	LM27952SD/NOPB
Manufacturer	MPS	MPS	Renesas	Analog Devices	Analog Devices	National Semiconductor
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Switched Capacitor (Charge Pump)
Number of Outputs	4	4	4	4	4	4
Voltage - Supply (Min)	4.5V	4.5V	4V	2.7V	2.7V	3V
Voltage - Supply (Max)	25V	25V	26.5V	30V	5.5V	5.5V
Voltage - Output	50V	50V	45V	44V	27V	2.5V ~ 3.9V
Current - Output / Channel	40mA	40mA	50mA	120mA	14mA, 30mA	30mA
Frequency	1.25MHz	1.25MHz	600kHz	200kHz ~ 2.1MHz	-	750kHz
Dimming Control	PWM	PWM	PWM	Analog, PWM	I2C	PWM
Package / Case	16-VFQFN Exposed Pad	16-VFQFN Exposed Pad	16-WFQFN Exposed Pad	32-WFQFN Exposed Pad	24-VFQFN Exposed Pad, CSP	14-WFDFN Exposed Pad
Operating Temperature	-40°C ~ 125°C (TJ)	-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)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Product Status	Not For New Designs	Not For New Designs	Active	Active	Active	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement): MP3384EQ-LF-P is a parametric equivalent to MP3384EQ-LF-Z, differing only in packaging variant (Tape & Reel vs. alternative packaging). Both devices share identical electrical specifications, operating ranges, and thermal characteristics. This substitute is suitable for direct board-level replacement without design modification.

Manufacturer-Recommended Alternatives (Functional Substitutes):

ISL97684IRTZ-T (Renesas Electronics) is an active-status alternative offering higher output current (50mA vs. 40mA per channel) and extended supply voltage range (4V to 26.5V). The 16-TQFN package is mechanically compatible with the original 16-QFN footprint. Operating temperature range is reduced to -40°C to 85°C. This device is suitable for applications where higher current capacity is beneficial.

LT3599EUH#PBF (Analog Devices) provides significantly higher output current capability (120mA per channel) and dual dimming control (Analog and PWM). The 32-QFN package is larger than the original, requiring PCB layout modification. Extended supply voltage range (2.7V to 30V) and full temperature range (-40°C to 125°C) support demanding applications. This substitute is appropriate when increased current headroom or dual dimming control is required.

ADP5520ACPZ-R7 (Analog Devices) operates from lower supply voltages (2.7V to 5.5V) with reduced output voltage (27V) and current (14mA, 30mA per channel). I2C dimming control replaces PWM functionality. The 24-LFCSP package requires significant PCB redesign. This device is suitable only for applications with lower voltage and current requirements and I2C control capability.

LM27952SD/NOPB (National Semiconductor) uses switched capacitor (charge pump) topology instead of boost regulation, limiting output voltage to 2.5V to 3.9V. This topology is fundamentally incompatible with the original 50V output requirement and is not suitable as a substitute for high-voltage backlight applications.

Compliance and Regulatory Status: All active-status alternatives (ISL97684IRTZ-T, LT3599EUH#PBF, ADP5520ACPZ-R7) maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original MP3384EQ-LF-Z.

Frequently Asked Questions (FAQ)

Q: Can MP3384EQ-LF-P be used as a direct replacement for MP3384EQ-LF-Z? A: Yes. MP3384EQ-LF-P is a parametric equivalent with identical electrical and thermal specifications. The difference is packaging format (Tape & Reel variant). No design changes are required.

Q: What is the primary difference between the MP3384EQ-LF-Z and ISL97684IRTZ-T? A: ISL97684IRTZ-T offers higher output current per channel (50mA vs. 40mA) and operates from 4V minimum input (vs. 4.5V). Output voltage is 45V (vs. 50V). Operating temperature range is -40°C to 85°C (vs. -40°C to 125°C). The 16-TQFN package is mechanically compatible with the original 16-QFN footprint.

Q: Is LT3599EUH#PBF a suitable substitute if I need higher current capability? A: Yes, if your application can accommodate the larger 32-QFN (5x5mm) package and PCB layout changes. LT3599EUH#PBF provides 120mA per channel output current, significantly exceeding the original 40mA specification. It maintains full temperature range (-40°C to 125°C) and supports both analog and PWM dimming.

Q: Why is LM27952SD/NOPB not recommended as a substitute? A: LM27952SD/NOPB uses switched capacitor (charge pump) topology, which limits maximum output voltage to 3.9V. The original MP3384EQ-LF-Z requires 50V output for backlight applications. This fundamental topology difference makes LM27952SD/NOPB functionally incompatible.

Q: What are the package compatibility considerations for substitutes? A: MP3384EQ-LF-P uses the same 16-QFN (3x3mm) footprint as the original. ISL97684IRTZ-T uses 16-TQFN (3x3mm), which is mechanically compatible. LT3599EUH#PBF requires 32-QFN (5x5mm), necessitating PCB redesign. ADP5520ACPZ-R7 uses 24-LFCSP-VQ (4x4mm), also requiring layout modification.

Q: Does ADP5520ACPZ-R7 support PWM dimming like the original? A: No. ADP5520ACPZ-R7 uses I2C digital control for dimming instead of PWM. If your application requires PWM dimming, this substitute is not suitable.

Q: Are all substitute parts RoHS3 compliant? A: All active-status alternatives (ISL97684IRTZ-T, LT3599EUH#PBF, ADP5520ACPZ-R7) are ROHS3 compliant. RoHS status for LM27952SD/NOPB is not specified in available documentation.

Q: What is the minimum supply voltage requirement for each substitute? A: MP3384EQ-LF-Z and MP3384EQ-LF-P require 4.5V minimum. ISL97684IRTZ-T operates from 4V. LT3599EUH#PBF, ADP5520ACPZ-R7, and LM27952SD/NOPB all operate from 2.7V to 3V minimum, supporting lower-voltage applications.

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