MPQ3387LGRT-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MPQ3387LGRT-Z is a 6-output LED driver IC manufactured by Monolithic Power Systems Inc., designed for backlight applications. It functions as a step-up (boost) DC-DC regulator with PWM and analog dimming capabilities, delivering 45mA per channel at up to 45V output. The device operates from a 3V to 25V supply and is qualified to AEC-Q100 automotive standards. This part is currently active in production with 975 units in stock.

Equivalent and substitute parts are identified based on matching functional topology, output configuration, dimming control methods, and electrical operating ranges. Substitutes enable design flexibility, supply chain alternatives, and performance optimization for specific application requirements.

Key Parameters

Parameter	MPQ3387LGRT-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	24kHz ~ 27.5kHz
Dimming	Analog, PWM
Package / Case	24-WFQFN Exposed Pad
Operating Temperature	Not specified
RoHS Status	ROHS3 Compliant
Qualification	AEC-Q100

Substitute Part Grouping Explanation

Substitute parts for the MPQ3387LGRT-Z are selected based on the following critical parameters:

Functional Equivalence Criteria:

Topology: Step-Up (Boost) DC-DC regulator
Output Configuration: 6-output LED driver
Dimming Control: PWM and/or Analog dimming capability
Applications: Backlight

Electrical Compatibility Range:

Supply voltage overlap with 3V–25V input range
Output voltage capability at or above 45V
Current per channel at or above 45mA
Switching frequency suitable for LED driver applications

Packaging & Compliance:

Surface mount technology
ROHS3 compliance
Active product status

Substitutes are grouped into two categories: direct functional equivalents with similar electrical specifications, and alternative solutions with extended or modified parameter ranges suitable for backlight LED driver applications.

Parameter Comparison

Parameter	MPQ3387LGRT-Z	LP8556TME-E02/NOPB	TPS61177RGRR	LT3598EFE#PBF	TPS61182RTET	LED7706TR
Manufacturer	Monolithic Power Systems	Texas Instruments	Texas Instruments	Analog Devices Inc.	Texas Instruments	STMicroelectronics
Type	DC DC Regulator	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)	Step-Up (Boost)
Number of Outputs	6	6	6	6	6	6
Voltage Supply (Min)	3V	2.7V	2.5V	3V	5V	4.5V
Voltage Supply (Max)	25V	20V	24V	30V	24V	36V
Voltage Output	45V	7V ~ 43V	39V	44V	38V	36V
Current Output / Channel	45mA	50mA	30mA	30mA	25mA	30mA
Frequency	24kHz ~ 27.5kHz	312kHz, 625kHz, 1250kHz	1.25MHz	200kHz ~ 2.5MHz	1.3MHz	250kHz ~ 1MHz
Dimming	Analog, PWM	PWM	Analog, PWM	Analog, PWM	PWM	PWM
Package / Case	24-WFQFN Exposed Pad	20-WFBGA, DSBGA	20-VFQFN Exposed Pad	24-TSSOP Exposed Pad	16-WFQFN Exposed Pad	24-VFQFN Exposed Pad
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

LP8556TME-E02/NOPB — Direct functional equivalent with 50mA per-channel capability, exceeding the 45mA requirement. Output voltage range 7V–43V covers the 45V target. Supports PWM dimming. 20-DSBGA package differs from the original 24-WFQFN. All parts are ROHS3 compliant and active.

TPS61177RGRR — Supports both analog and PWM dimming, matching the MPQ3387LGRT-Z feature set. Output voltage 39V is within acceptable range for backlight applications. 20-VQFN package is smaller than the original. Suitable for designs requiring dual dimming control.

LT3598EFE#PBF — Highest output voltage capability at 44V, closest to the 45V specification. Supports analog and PWM dimming. 24-TSSOP package offers different thermal and layout characteristics. Operating temperature range extends to 125°C junction temperature.

TPS61182RTET — Compact 16-WQFN package alternative. Output voltage 38V and 25mA per-channel current are reduced compared to the main part. Suitable for lower-power backlight applications. PWM dimming only.

LED7706TR — Highest supply voltage range (4.5V–36V) and output voltage (36V). 24-VFQFN package matches the original form factor. Largest inventory availability (16,082 units). PWM dimming only.

All substitute parts maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can LP8556TME-E02/NOPB replace MPQ3387LGRT-Z in a direct board-level substitution?

A: Electrical functionality is compatible. The 50mA per-channel output exceeds the 45mA requirement. However, the package differs: 20-DSBGA versus 24-WFQFN. PCB layout and thermal management must be re-evaluated. Pinout verification is required before implementation.

Q: What is the key difference between TPS61177RGRR and TPS61182RTET?

A: TPS61177RGRR supports both analog and PWM dimming with 30mA per-channel output and 39V maximum voltage. TPS61182RTET supports PWM dimming only with 25mA per-channel output and 38V maximum voltage. TPS61177RGRR is preferred for applications requiring dual dimming control.

Q: Is LT3598EFE#PBF suitable for automotive applications?

A: LT3598EFE#PBF is ROHS3 compliant and active. The input data does not specify AEC-Q100 qualification. Verify automotive qualification requirements against design specifications before selection.

Q: Why does LED7706TR have the highest inventory?

A: LED7706TR has 16,082 units in stock compared to 975 units for MPQ3387LGRT-Z. This reflects supply chain positioning and market demand. Electrical specifications remain the primary selection criterion.

Q: Can I use a substitute with lower current per-channel rating?

A: Substitutes with lower current ratings (e.g., TPS61182RTET at 25mA) are not suitable if the application requires the full 45mA per-channel output. Verify actual LED current requirements before selecting a lower-rated alternative.

Q: What packaging considerations apply when switching from 24-WFQFN to 20-DSBGA?

A: Package footprint, pin pitch, thermal pad size, and PCB routing differ significantly. 20-DSBGA is smaller and may offer improved thermal performance. Complete PCB redesign and thermal analysis are required.

Q: Are all substitute parts available in the same moisture sensitivity level?

A: No. MPQ3387LGRT-Z has MSL 1 (Unlimited). Most substitutes have MSL 2 or MSL 3, requiring stricter moisture control during storage and assembly. Verify handling and storage requirements for your manufacturing process.

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