MP3356DG-LF-P LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP3356DG-LF-P is a LED Driver IC manufactured by Monolithic Power Systems Inc., classified as a Power Management PMIC. This device functions as a 1-output DC DC regulator with flyback topology, designed for camera flash applications. It operates with a supply voltage range of 2.8V to 6V and delivers a 50V output. The part is packaged in a 10-QFN (2x2) form factor and is mounted as a surface mount component.

The MP3356DG-LF-P carries a product status of "Not For New Designs," indicating it is obsolete or being phased out. This status necessitates identification of equivalent and substitute parts for ongoing production, maintenance, and new design implementations where similar functionality is required.

Key Parameters

Parameter	Value
Manufacturer Part Number	MP3356DG-LF-P
Manufacturer	Monolithic Power Systems Inc.
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Flyback
Number of Outputs	1
Voltage - Supply (Min)	2.8V
Voltage - Supply (Max)	6V
Voltage - Output	50V
Internal Switch(s)	Yes
Package / Case	10-TFQFN
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitute parts for the MP3356DG-LF-P are selected based on the following critical parameters that determine functional compatibility:

Primary Selection Criteria:

DC DC Regulator type with internal switching capability
Single output configuration
Supply voltage range compatibility (minimum 2.8V to 6V input tolerance)
Output voltage capability (50V or higher)
Surface mount packaging
Operating temperature range (-40°C to 85°C or wider)
Active product status for ongoing availability
ROHS3 compliance and automotive-grade qualification where applicable

Topology Considerations: The MP3356DG-LF-P uses flyback topology. Substitute parts may employ alternative topologies including step-down (buck), step-up (boost), SEPIC, or switched capacitor (charge pump) configurations, provided they meet the voltage and current requirements for camera flash and lighting applications.

Application Alignment: Substitute parts are grouped by their suitability for camera flash, backlight, and general lighting applications, ensuring functional equivalence in end-use scenarios.

Parameter Comparison

Parameter	MP3356DG-LF-P	AL8860WT-7	AP3036BKTR-G1	FAN5333ASX	ISL78100ARZ-T	LM2758TLX/NOPB	LM3405XMK/NOPB	LM3406HVMHX/NOPB	LM3410XSDX/NOPB	MCP1662T-E/MNY
Manufacturer	MPS	Diodes Inc.	Diodes Inc.	onsemi	Renesas	National Semi.	Texas Inst.	Texas Inst.	Texas Inst.	Microchip
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator
Topology	Flyback	Step-Down (Buck)	Step-Up (Boost)	Step-Up (Boost)	Step-Down/Step-Up	Switched Capacitor	Step-Down (Buck)	Step-Down (Buck)	SEPIC/Step-Up	Step-Up (Boost)
Number of Outputs	1	1	1	1	1	1	1	1	1	1
Voltage - Supply (Min)	2.8V	4.5V	2.5V	1.8V	2.7V	2.7V	3V	6V	2.7V	2.4V
Voltage - Supply (Max)	6V	40V	16V	5.5V	16V	5.5V	15V	75V	5.5V	5.5V
Voltage - Output	50V	36V	—	30V	32V	2.7V ~ 5.3V	14.6V	—	3V ~ 24V	32V
Current - Output / Channel	—	1A	550mA (Switch)	1.5A (Switch)	1A	700mA	1A	1.5A	2.8A (Switch)	200mA
Frequency	—	1MHz	1MHz	1.5MHz	1MHz	1.25MHz	1.6MHz	10kHz ~ 1MHz	1.6MHz	500kHz
Dimming	—	Analog, PWM	PWM	Analog, PWM	Analog, PWM	—	PWM	PWM	PWM	PWM
Internal Switch(s)	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Operating Temperature	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	10-TFQFN	SOT-23-5	SOT-23-6	SOT-23-5	20-VFQFN	12-WFBGA	SOT-23-6	14-PowerTSSOP	6-WDFN	8-WFDFN
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes for Camera Flash Applications:

LM2758TLX/NOPB is the most direct functional equivalent for camera flash applications. This switched capacitor (charge pump) topology LED driver operates within the 2.7V to 5.5V supply range and delivers 700mA output current. It maintains the same operating temperature range (-40°C to 85°C) as the MP3356DG-LF-P and is ROHS3 compliant with active product status, ensuring long-term availability and supply chain stability.

Secondary Substitutes for Lighting and Backlight Applications:

For applications requiring higher output voltage or current capability, the following active parts provide suitable alternatives:

ISL78100ARZ-T (Renesas) offers dual topology (step-down/step-up) with 1A output current and 32V output voltage capability. This part includes automotive-grade qualification (AEC-Q100) and operates across -40°C to 105°C, providing extended temperature performance. The 20-QFN package requires PCB layout redesign compared to the 10-QFN original.

LM3410XSDX/NOPB (Texas Instruments) combines SEPIC and step-up topologies with 2.8A switch current and 3V to 24V output range. Operating temperature extends to 125°C with ROHS3 compliance and active status. The 6-WSON package represents a significant footprint reduction.

FAN5333ASX (onsemi) provides step-up topology with 1.5A switch current and 30V output voltage. Supply range extends to 1.8V minimum with 1.5MHz switching frequency. Active product status and ROHS3 compliance support long-term design continuity.

Package Considerations:

All substitute parts employ surface mount technology. Package changes from the original 10-QFN require PCB layout modifications. Smaller packages (6-WSON, 8-WFDFN) reduce board area but may increase thermal management complexity. Larger packages (14-HTSSOP, 20-QFN) provide improved thermal dissipation for higher current applications.

Compliance and Availability:

All recommended substitutes maintain ROHS3 compliance and active product status, ensuring regulatory conformance and supply chain continuity. ISL78100ARZ-T and LM3406HVMHX/NOPB include automotive-grade qualification for applications requiring AEC-Q100 certification.

Frequently Asked Questions (FAQ)

Q: Can the MP3356DG-LF-P be directly replaced with LM2758TLX/NOPB without PCB modifications?

A: LM2758TLX/NOPB uses 12-DSBGA packaging versus the original 10-QFN, requiring PCB footprint redesign. However, both devices operate within compatible voltage ranges (2.7V to 5.5V supply) and deliver similar output current for camera flash applications. Electrical functionality is compatible; physical layout changes are necessary.

Q: What is the primary difference between flyback topology (MP3356DG-LF-P) and step-up boost topology (FAN5333ASX)?

A: Flyback topology uses transformer-based energy transfer with galvanic isolation capability, while step-up (boost) topology uses inductor-based energy transfer without isolation. Both achieve voltage step-up from lower input to higher output. Step-up topology typically offers higher efficiency in non-isolated applications but requires different external component designs. Substitution requires circuit redesign and validation.

Q: Why do substitute parts have different output voltage ratings?

A: The MP3356DG-LF-P delivers fixed 50V output for camera flash applications. Substitute parts offer programmable or fixed output voltages (30V to 36V) suitable for backlight and general lighting. Selection depends on specific application voltage requirements. Parts with lower output voltage ratings (LM2758TLX/NOPB at 2.7V to 5.3V) are suitable only for low-voltage LED applications.

Q: Are all substitute parts suitable for camera flash applications?

A: LM2758TLX/NOPB is specifically designed for camera flash with 700mA output current and appropriate voltage range. Other substitutes (FAN5333ASX, LM3410XSDX/NOPB, MCP1662T-E/MNY) are optimized for backlight and general lighting applications. Application-specific validation is required before substitution in camera flash designs.

Q: What does "Not For New Designs" status mean for the MP3356DG-LF-P?

A: This status indicates the part is obsolete or being discontinued by the manufacturer. New designs should not incorporate this part. Existing production may continue with available inventory, but long-term supply is not guaranteed. Substitution with active-status parts (all listed alternatives) is recommended for design continuity and future production.

Q: How do operating temperature ranges affect part selection?

A: The MP3356DG-LF-P operates -40°C to 85°C. Substitute parts extend to 105°C (AL8860WT-7, ISL78100ARZ-T) or 125°C (LM3405XMK/NOPB, LM3406HVMHX/NOPB, LM3410XSDX/NOPB, MCP1662T-E/MNY). Extended temperature range provides design margin for high-ambient or high-power applications. Selection depends on thermal environment and reliability requirements.

Q: What packaging considerations apply when substituting the 10-QFN original?

A: The 10-QFN (2x2) package is compact with 0.5mm pitch. Substitutes use SOT-23-5, SOT-23-6, 6-WSON, 8-WFDFN, 12-DSBGA, 14-HTSSOP, or 20-QFN packages. Smaller packages reduce board area but may complicate thermal management. Larger packages improve thermal performance but increase footprint. PCB redesign is required for all package changes.

Q: Do all substitute parts require the same external component values?

A: No. Different topologies and switching frequencies require different inductor, capacitor, and resistor values. Flyback topology (MP3356DG-LF-P) uses transformer-based design, while boost topology uses inductor-based design. Complete circuit redesign and validation are necessary for any topology change. Refer to manufacturer datasheets for external component specifications.

Q: Which substitute offers the best thermal performance?

A: LM3406HVMHX/NOPB in 14-HTSSOP package provides the largest thermal footprint with 1.5A output current capability and extended temperature range to 125°C. LM3410XSDX/NOPB in 6-WSON offers high current density (2.8A switch current) in compact form. Thermal performance depends on PCB layout, copper area, and thermal vias. Manufacturer thermal models should be consulted for specific applications.

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