MP3304ADD-LF-P LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP3304ADD-LF-P is a LED Driver IC manufactured by Monolithic Power Systems, designed as a 1-output DC-DC regulator with step-up (boost) topology, PWM dimming capability, and 1.33A switch current rating in an 8-QFN (2x3) package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary to support existing designs, maintain production continuity, and identify active alternatives that meet the same electrical and mechanical requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	MP3304ADD-LF-P
Manufacturer	Monolithic Power Systems
Product Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	1
Voltage Supply Range	3V to 6V
Output Voltage	36V
Current Output / Channel	1.33A (Switch)
Switching Frequency	2.2MHz
Dimming Control	PWM
Package / Case	8-TFDFN Exposed Pad
Supplier Device Package	8-QFN (2x3)
Operating Temperature	-40°C to 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Not For New Designs

Substitute Part Grouping Explanation

Substitute parts for the MP3304ADD-LF-P are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Topology: Step-Up (Boost) DC-DC Regulator
Number of Outputs: 1
Dimming Control: PWM
Internal Switch: Yes
Operating Temperature Range: -40°C to 85°C
RoHS3 Compliance and MSL 1 rating

Secondary Compatibility Parameters:

Voltage Supply Range: 3V to 6V (or compatible range)
Output Voltage: 36V (or compatible output capability)
Current Rating: 1.33A (or higher switch current)
Switching Frequency: 2.2MHz (or compatible frequency)
Package: 8-QFN (2x3) or equivalent surface-mount package

Substitute parts are divided into two categories:

Parametric Equivalents (Same Base Product Series): MP3304BDD-LF-P, MP3304BDD-LF-Z, MP3305DD-LF-P, MP3305DD-LF-Z — These are active variants within the Monolithic Power Systems MP3304/MP3305 product families with identical or superior electrical specifications.
Manufacturer-Recommended Alternatives (Cross-Manufacturer Substitutes): Parts from Analog Devices, Diodes Incorporated, Rohm Semiconductor, and Lumissil Microsystems that meet the core functional requirements of LED driver IC operation with step-up boost topology and PWM dimming.

Parameter Comparison

Part Number	Manufacturer	Topology	Supply Voltage (Min-Max)	Output Voltage	Current Output	Frequency	Dimming	Package	Product Status	Inventory
MP3304ADD-LF-P	Monolithic Power Systems	Step-Up (Boost)	3V - 6V	36V	1.33A (Switch)	2.2MHz	PWM	8-QFN (2x3)	Not For New Designs	1800 Pcs
MP3304BDD-LF-P	Monolithic Power Systems Inc.	Step-Up (Boost)	3V - 6V	24V	1.33A (Switch)	2.2MHz	PWM	8-QFN (2x3)	Active	3249 Pcs
MP3304BDD-LF-Z	Monolithic Power Systems Inc.	Step-Up (Boost)	3V - 6V	24V	1.33A (Switch)	2.2MHz	PWM	8-QFN (2x3)	Active	4777 Pcs
MP3305DD-LF-P	Monolithic Power Systems Inc.	Step-Up (Boost)	2.5V - 6V	36V	1.33A (Switch)	2.2MHz	PWM	8-QFN (2x3)	Active	738 Pcs
MP3305DD-LF-Z	Monolithic Power Systems Inc.	Step-Up (Boost)	2.5V - 6V	36V	1.33A (Switch)	2.2MHz	PWM	8-QFN (2x3)	Active	18461 Pcs
ADP1655ACBZ-R7	Analog Devices Inc.	Step-Up (Boost)	2.7V - 5.5V	—	500mA (Flash)	2MHz	I2C	12-WLCSP (1.5x2)	Active	2252 Pcs
AL8860WT-7	Diodes Incorporated	Step-Down (Buck)	4.5V - 40V	36V	1A	1MHz	Analog, PWM	SOT-23-5	Active	30100 Pcs
AP3036BKTR-G1	Diodes Incorporated	Step-Up (Boost)	2.5V - 16V	—	550mA (Switch)	1MHz	PWM	SOT-23-6	Active	19130 Pcs
AP5726WG-7	Diodes Incorporated	Step-Up (Boost)	2.7V - 5.5V	—	750mA (Switch)	1.2MHz	PWM	SOT-23-6	Active	4610 Pcs
BD6071HFN-TR	Rohm Semiconductor	Step-Up (Boost)	2.7V - 5.5V	14V	35mA	1MHz	PWM	8-HSON	Active	17086 Pcs
IS31LT3352-V1GRLS2-TR	Lumissil Microsystems	Step-Down (Buck)	6V - 40V	—	750mA	1MHz	Analog, PWM	8-SOP	Active	1011 Pcs

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Topology):

MP3305DD-LF-Z is the preferred substitute. It maintains the 8-QFN (2x3) package, step-up boost topology, 1.33A switch current, 2.2MHz frequency, and PWM dimming control. The supply voltage range extends to 2.5V minimum (versus 3V for the original), and output voltage matches at 36V. Product status is Active with the highest inventory (18,461 pcs). RoHS3 compliance and MSL 1 rating are identical.

MP3305DD-LF-P is an alternative with the same electrical specifications and Active status, though with lower inventory (738 pcs).

For Same-Series Alternatives (Lower Output Voltage):

MP3304BDD-LF-Z and MP3304BDD-LF-P are Active variants with identical topology, current rating, frequency, and package. Output voltage is 24V instead of 36V. These are suitable if the application can operate at the lower output voltage. MP3304BDD-LF-Z has higher inventory (4,777 pcs).

For Cross-Manufacturer Substitutes:

Selection depends on specific application requirements:

ADP1655ACBZ-R7 (Analog Devices): Step-up boost topology, Active status, but uses I2C dimming control instead of PWM and lower current rating (500mA flash). Package is 12-WLCSP, not 8-QFN. Suitable only if I2C control is acceptable.
AP3036BKTR-G1 and AP5726WG-7 (Diodes Incorporated): Step-up boost topology with PWM dimming. AP5726WG-7 offers 750mA current in SOT-23-6 package. Both are Active with good inventory. Package change from 8-QFN requires PCB redesign.
AL8860WT-7 and IS31LT3352-V1GRLS2-TR: Step-down (buck) topology, not step-up. Fundamentally different circuit topology; suitable only if buck regulation is acceptable for the application.
BD6071HFN-TR (Rohm Semiconductor): Step-up boost topology, PWM dimming, Active status. Output voltage is 14V and current is 35mA, significantly lower than the original. Suitable for lower-power LED applications only.

Frequently Asked Questions (FAQ)

Q: Can I use MP3304BDD-LF-Z as a direct replacement for MP3304ADD-LF-P?

A: MP3304BDD-LF-Z is electrically compatible in topology, package, frequency, and current rating. The key difference is output voltage: 24V versus 36V. If your circuit is designed for 36V output, this substitute will not work without redesign. If your application can operate at 24V, this is a valid substitute with Active status and high inventory.

Q: Why is MP3305DD-LF-Z recommended over MP3304BDD-LF-Z?

A: MP3305DD-LF-Z matches the original 36V output voltage specification, making it a true functional equivalent. Both are in the same 8-QFN package with identical topology and current rating. MP3305DD-LF-Z has higher inventory (18,461 pcs) and extends the minimum supply voltage to 2.5V, providing greater design flexibility.

Q: Can I substitute a step-down (buck) topology part like AL8860WT-7 for the step-up (boost) MP3304ADD-LF-P?

A: No. Step-down and step-up topologies are fundamentally different circuit architectures. A buck regulator steps voltage down; a boost regulator steps voltage up. Substituting one for the other requires complete circuit redesign and is not a valid component-level replacement.

Q: What does "Not For New Designs" mean for the MP3304ADD-LF-P?

A: This status indicates the part has reached end-of-life and is no longer recommended for new product development. Existing inventory may still be available, but long-term supply is not guaranteed. Active alternatives like MP3305DD-LF-Z should be used for new designs.

Q: Does package change from 8-QFN to SOT-23-6 require PCB redesign?

A: Yes. Different packages have different pin configurations, footprints, and thermal characteristics. Changing from 8-QFN (2x3) to SOT-23-6 requires PCB layout modification, re-routing, and thermal analysis. This is not a drop-in replacement.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed in this reference are RoHS3 compliant and meet the same environmental compliance standards as the original MP3304ADD-LF-P.

Q: What is the significance of MSL 1 (Unlimited) moisture sensitivity?

A: MSL 1 indicates the component has unlimited shelf life and does not require special moisture-control handling during storage and assembly. All recommended substitutes maintain MSL 1 rating, ensuring compatibility with standard manufacturing processes.

Q: Can I use ADP1655ACBZ-R7 if my design uses PWM dimming?

A: No. ADP1655ACBZ-R7 uses I2C digital control for dimming, not PWM analog control. If your circuit is designed for PWM dimming signals, this part is not compatible without firmware and circuit redesign.

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