MP3366GC-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP3366GC-Z is an active LED driver IC manufactured by Monolithic Power Systems Inc., designed for backlight applications requiring multi-output DC-DC regulation. This 6-output Step-Up (Boost) regulator operates from 3V to 25V input, delivering 45V output with 45mA per channel capacity. The device integrates PWM and analog dimming control, operating at 600kHz switching frequency in an 18-WLCSP package (1.35x2.55mm).

Equivalent and substitute parts are identified based on matching functional topology, output configuration, dimming capability, and electrical operating ranges. Substitutes maintain the same application focus (backlight LED driving) while accommodating variations in package form factor, current capacity, and supply voltage ranges.

Key Parameters

Parameter	MP3366GC-Z
Manufacturer	Monolithic Power Systems Inc.
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	6
Voltage - Supply (Min)	3V
Voltage - Supply (Max)	25V
Voltage - Output	45V
Current - Output / Channel	45mA
Frequency	600kHz
Dimming	Analog, PWM
Applications	Backlight
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	18-UFBGA, WLCSP
Product Status	Active
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the MP3366GC-Z is based on the following critical parameters:

Primary Matching Criteria:

Topology: Step-Up (Boost) DC-DC regulation
Number of Outputs: 6 outputs (primary requirement)
Output Voltage: 40V to 45V range
Current Capacity: 30mA to 85mA per channel
Dimming Control: PWM and/or Analog capability
Application: Backlight LED driving
Product Status: Active

Secondary Compatibility Factors:

Supply Voltage Range: Minimum 2.7V to 4.5V; Maximum 20V to 36V
Operating Temperature: -40°C to 85°C or higher
Compliance: ROHS3 Compliant
Package Type: Surface Mount (various form factors acceptable)

Substitutes are grouped by topology alignment and output configuration. Parts with 5 outputs or alternative topologies (Switched Capacitor) are included where electrical parameters otherwise align, with explicit notation of configuration differences.

Parameter Comparison

Parameter	MP3366GC-Z	ALED7707TR	ISL97671AIRZ-T	LP8556SQ-E09/NOPB	LP8550TLE/NOPB	LT3598EUF#TRPBF	TPS61176RTER
Manufacturer	MPS	STMicroelectronics	Renesas	Texas Instruments	National Semiconductor	Analog Devices	Texas Instruments
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)
Number of Outputs	6	6	6	6	6	6	6
Voltage - Supply (Min)	3V	4.5V	4.5V	2.7V	2.7V	3V	2.7V
Voltage - Supply (Max)	25V	36V	26.5V	20V	22V	30V	6.5V
Voltage - Output	45V	36V	45V	7V ~ 43V	40V	44V	38V
Current - Output / Channel	45mA	85mA	50mA	50mA	50mA	30mA	35mA
Frequency	600kHz	250kHz ~ 1MHz	600kHz, 1.14MHz	312kHz, 625kHz, 1250kHz	-	200kHz ~ 2.5MHz	1MHz
Dimming	Analog, PWM	PWM	PWM	PWM	PWM	Analog, PWM	Analog, PWM
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 150°C (TJ)	-40°C ~ 85°C (TA)	-30°C ~ 85°C (TA)	-30°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
Package / Case	18-UFBGA, WLCSP	24-VQFN Exposed Pad	20-VFQFN Exposed Pad	24-WFQFN Exposed Pad	25-WFBGA	24-WFQFN Exposed Pad	16-WFQFN Exposed Pad
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

ALED7707TR, ISL97671AIRZ-T, LP8556SQ-E09/NOPB, and LP8550TLE/NOPB maintain 6-output Step-Up topology with output voltage and current specifications within acceptable ranges for backlight applications. All are ROHS3 compliant and active products. ALED7707TR offers automotive-grade qualification (AEC-Q100) with extended temperature range (-40°C to 150°C). ISL97671AIRZ-T matches the 45V output specification exactly. LP8556 variants provide flexible output voltage configuration (7V to 43V) and multiple frequency options.

Secondary Substitutes (Functional Equivalence with Trade-offs):

LT3598EUF#TRPBF and LT3598IUF#PBF provide dual dimming capability (Analog and PWM) matching the MP3366GC-Z, with extended temperature range (-40°C to 125°C junction temperature). Current capacity is reduced to 30mA per channel. Supply voltage range extends to 30V maximum.

TPS61176RTER operates from narrower supply range (2.7V to 6.5V) with reduced output voltage (38V) and current (35mA per channel). Dual dimming control is supported. This part is suitable for lower-voltage input applications.

Alternative Topology (Limited Substitution):

FAN5701UMP15X employs Switched Capacitor (Charge Pump) topology rather than Step-Up (Boost), with significantly reduced current capacity (15mA per channel) and supply voltage range (2.7V to 5.5V). This part is not recommended as a direct substitute but may serve specialized low-power backlight applications.

Configuration Variance:

LP8556SQE-E00/NOPB and LP8556TME-E05/NOPB are LP8556 variants with 5 outputs and 6 outputs respectively. The 5-output variant (LP8556SQE-E00/NOPB) represents a functional reduction and should be selected only when 5-output configuration is acceptable.

Frequently Asked Questions (FAQ)

Q: Can ALED7707TR directly replace MP3366GC-Z in existing designs?

A: ALED7707TR is functionally equivalent in topology, output count, and application focus. However, package form factor differs (24-QFN vs. 18-WLCSP), requiring PCB layout modification. Output voltage is 36V versus 45V; verify that your application tolerates this reduction. ALED7707TR supports PWM dimming only; if analog dimming is required, select LT3598EUF#TRPBF or TPS61176RTER instead.

Q: What is the difference between MP3366GC-Z and LP8556SQ-E09/NOPB?

A: Both are 6-output Step-Up regulators for backlight applications. LP8556SQ-E09/NOPB offers wider output voltage range (7V to 43V) with programmable frequency options (312kHz, 625kHz, 1250kHz). Supply voltage maximum is lower (20V vs. 25V). Current capacity is equivalent (50mA per channel). Package is larger (24-WQFN vs. 18-WLCSP). Both support PWM dimming; MP3366GC-Z adds analog dimming capability.

Q: Is TPS61176RTER suitable for applications requiring 45V output?

A: No. TPS61176RTER maximum output voltage is 38V, which is below the MP3366GC-Z specification of 45V. This part is restricted to applications requiring output voltages up to 38V. Additionally, supply voltage range is narrower (2.7V to 6.5V), limiting input flexibility.

Q: Why does FAN5701UMP15X appear in the substitute list if it uses different topology?

A: FAN5701UMP15X is included for reference as a 6-output LED driver IC with backlight application focus. However, Switched Capacitor (Charge Pump) topology differs fundamentally from Step-Up (Boost) regulation. Current capacity is significantly reduced (15mA vs. 45mA per channel), and output voltage is unspecified. This part is not recommended as a direct substitute and should be evaluated only for specialized low-power applications.

Q: What are the package implications when substituting MP3366GC-Z?

A: MP3366GC-Z uses 18-WLCSP (1.35x2.55mm), a compact ball grid array package. Most substitutes employ larger QFN packages (16-WQFN to 24-WQFN, 3x3mm to 5x5mm). LP8550TLE/NOPB uses 25-WFBGA package. Package change requires PCB redesign, including land pattern modification, trace routing adjustment, and thermal management evaluation. Verify PCB space availability before selecting a substitute with larger package footprint.

Q: Which substitute offers the best temperature performance?

A: ALED7707TR provides the highest maximum operating temperature (150°C junction temperature) with automotive-grade qualification (AEC-Q100). MP3366GC-Z and LT3598 variants operate to 125°C junction temperature. All other substitutes are rated to 85°C ambient temperature maximum. Select ALED7707TR for high-temperature environments or automotive applications.

Q: Can I use LP8556SQE-E00/NOPB as a substitute if my design uses only 5 LED strings?

A: Yes, if your application requires exactly 5 outputs. LP8556SQE-E00/NOPB is a 5-output variant of the LP8556 family with identical electrical specifications to the 6-output LP8556SQ-E09/NOPB. All other parameters remain equivalent. Do not use this part if your design requires 6 independent output channels.

Q: What dimming control options are available across substitutes?

A: MP3366GC-Z supports both Analog and PWM dimming. LT3598EUF#TRPBF and TPS61176RTER also support dual dimming modes. ALED7707TR, ISL97671AIRZ-T, LP8556 variants, and LP8550TLE/NOPB support PWM dimming only. FAN5701UMP15X supports PWM dimming with Switched Capacitor topology. Select dual-dimming parts (LT3598 or TPS61176) only if analog dimming control is required in your application.

Q: Are all substitutes ROHS3 compliant?

A: ALED7707TR, ISL97671AIRZ-T, LP8556 variants, LT3598 variants, and TPS61176RTER are explicitly ROHS3 compliant. LP8550TLE/NOPB and FAN5701UMP15X do not specify RoHS status in provided data. Verify RoHS compliance with manufacturer documentation before selecting these parts for regulated applications.

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