MP4655GY LED Driver Controller - Equivalent & Substitute Parts

Part Overview

The MP4655GY is an active LED driver controller IC manufactured by Monolithic Power Systems Inc., designed for flyback topology applications in backlight systems. This 28-SOIC surface mount device operates across a 9V to 35V supply range with integrated PWM and analog dimming capabilities, supporting frequencies from 20kHz to 350kHz. The part is RoHS3 compliant and currently in active production with 857 units in stock.

Substitute parts are identified when design requirements necessitate alternative topologies, different supply voltage ranges, enhanced output capabilities, or specific package form factors while maintaining functional equivalence for LED driver control applications.

Key Parameters

Parameter	MP4655GY
Manufacturer	Monolithic Power Systems Inc.
Category	Power Management (PMIC)
Type	DC DC Controller
Topology	Flyback
Number of Outputs	1
Voltage - Supply (Min)	9V
Voltage - Supply (Max)	35V
Frequency Range	20kHz ~ 350kHz
Dimming	Analog, PWM
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the MP4655GY is determined by the following criteria:

Primary Substitution Parameters:

Single output LED driver controller functionality
DC DC controller type classification
Operating temperature range: -40°C to 125°C (TJ)
Dimming capability: Analog and/or PWM support
RoHS3 compliance and active product status
Surface mount packaging

Topology Flexibility: Substitute parts may employ different topologies (Flyback, SEPIC, Step-Down Buck, Step-Up Boost, or combinations thereof) provided they maintain single-output LED driver controller functionality and support the required dimming methods.

Supply Voltage Consideration: Substitute parts must accommodate the MP4655GY's 9V to 35V supply range within their specified minimum and maximum voltage ratings. Parts with extended ranges (4.5V minimum or 60V+ maximum) remain compatible for this application.

Package and Frequency: While package form factors may differ (8-VSSOP, 16-HTSSOP, 16-QFN, 28-TSSOP), all substitutes maintain surface mount technology. Frequency ranges vary by topology but all operate within acceptable parameters for LED driver control.

Parameter Comparison

Parameter	MP4655GY	LM3401MMX/NOPB	LM3421Q1MHX/NOPB	LT3755IUD-1#PBF	LT8391AIFE#PBF
Manufacturer	MPS	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices
Type	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller	DC DC Controller
Topology	Flyback	Step-Down (Buck)	SEPIC, Step-Down (Buck), Step-Up (Boost)	Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)	Step-Down (Buck), Step-Up (Boost)
Number of Outputs	1	1	1	1	1
Voltage - Supply (Min)	9V	4.5V	4.5V	4.5V	4V
Voltage - Supply (Max)	35V	35V	75V	40V	60V
Frequency Range	20kHz ~ 350kHz	1.5MHz	2MHz	100kHz ~ 1MHz	600kHz ~ 2MHz
Dimming	Analog, PWM	PWM	Analog, PWM	Analog, PWM	Analog, PWM
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	28-SOIC	8-VSSOP	16-HTSSOP	16-QFN (3x3)	28-TSSOP-EP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

LM3401MMX/NOPB (Texas Instruments) This substitute operates within the MP4655GY supply voltage range (4.5V to 35V) and maintains single-output LED driver controller functionality. The Step-Down Buck topology differs from the original Flyback design but supports PWM dimming. MSL rating of 1 provides superior moisture resistance compared to the MP4655GY's MSL 3. Suitable for applications where Buck topology is acceptable and compact 8-VSSOP packaging is advantageous. RoHS3 compliant and active product status confirmed.

LM3421Q1MHX/NOPB (Texas Instruments) This part extends supply voltage capability to 75V maximum while maintaining 4.5V minimum, exceeding the MP4655GY's 9V to 35V range. Supports multiple topologies (SEPIC, Buck, Boost) with both Analog and PWM dimming. Automotive grade qualification (AEC-Q100) and MSL 1 rating provide enhanced reliability. 16-HTSSOP package offers moderate pin count. RoHS3 compliant and active product status confirmed.

LT3755IUD-1#PBF (Analog Devices Inc.) This substitute maintains Flyback topology compatibility with the MP4655GY while adding SEPIC, Buck, and Boost topology options. Supply voltage range of 4.5V to 40V encompasses the original 9V to 35V specification. Supports both Analog and PWM dimming across a 100kHz to 1MHz frequency range. 16-QFN (3x3) compact package with MSL 1 rating. RoHS3 compliant and active product status confirmed.

LT8391AIFE#PBF (Analog Devices Inc.) This part provides extended supply voltage range (4V to 60V) and supports Buck and Boost topologies with Analog and PWM dimming. Automotive grade qualification and 28-TSSOP-EP package with exposed pad offer thermal management advantages. Output voltage rated to 60V. Frequency range of 600kHz to 2MHz. MSL 1 rating and RoHS3 compliance confirmed. Active product status.

Frequently Asked Questions (FAQ)

Q: Can the LM3401MMX/NOPB replace the MP4655GY in all applications? A: The LM3401MMX/NOPB is functionally equivalent for LED driver control but employs Step-Down Buck topology instead of Flyback. Substitution is valid when Buck topology meets application requirements. The part supports PWM dimming but lacks analog dimming capability. Supply voltage range (4.5V to 35V) encompasses the MP4655GY specification.

Q: What is the primary difference between the LM3421Q1MHX/NOPB and MP4655GY? A: The LM3421Q1MHX/NOPB supports multiple topologies (SEPIC, Buck, Boost) versus the MP4655GY's Flyback-only design. It extends maximum supply voltage to 75V and includes automotive-grade qualification (AEC-Q100). Both support Analog and PWM dimming across the -40°C to 125°C operating range.

Q: Why does the LT3755IUD-1#PBF have a different package than the MP4655GY? A: The LT3755IUD-1#PBF uses 16-QFN (3x3) packaging versus the MP4655GY's 28-SOIC. Both are surface mount technologies suitable for automated assembly. Package selection depends on PCB layout constraints and thermal requirements. The QFN package provides superior thermal performance through its exposed pad design.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All four substitute parts (LM3401MMX/NOPB, LM3421Q1MHX/NOPB, LT3755IUD-1#PBF, and LT8391AIFE#PBF) are RoHS3 compliant with active product status, matching the MP4655GY's compliance profile.

Q: What does MSL rating mean for component selection? A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to moisture before soldering. The MP4655GY has MSL 3 (168 hours), while all substitutes have MSL 1 (unlimited). Lower MSL ratings provide greater flexibility in storage and handling without requiring special desiccant packaging.

Q: Can I use the LT8391AIFE#PBF in a 9V to 35V supply application? A: Yes. The LT8391AIFE#PBF supply voltage range (4V to 60V) fully encompasses the MP4655GY's 9V to 35V specification. The part is suitable for this voltage range and offers extended capability for higher voltage applications.

Q: Which substitute offers the best thermal performance? A: The LT8391AIFE#PBF and LT3755IUD-1#PBF both feature exposed pad packages (28-TSSOP-EP and 16-QFN respectively) that provide superior thermal dissipation compared to the MP4655GY's standard 28-SOIC package without exposed pad.

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