MP3308DL-LF-P LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP3308DL-LF-P is an active LED driver IC manufactured by Monolithic Power Systems Inc., designed for step-up (boost) DC-DC regulation with PWM dimming capability. This single-output regulator delivers 1.33A switch current and operates across a 3V to 6V supply range, making it suitable for backlight applications requiring 36V output. The device is packaged in a 14-QFN (3x4) form factor with RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when design requirements necessitate alternative packaging, different supply voltage ranges, modified output current specifications, or when the primary part becomes unavailable. Substitutes maintain functional equivalence within the LED driver IC category while accommodating specific application constraints.

Key Parameters

Parameter	MP3308DL-LF-P
Manufacturer	Monolithic Power Systems Inc.
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	1
Voltage Supply (Min)	3V
Voltage Supply (Max)	6V
Voltage Output	36V
Current Output / Channel	1.33A (Switch)
Frequency	2.2MHz
Dimming	PWM
Applications	Backlight
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	14-VFDFN Exposed Pad
Supplier Device Package	14-QFN (3x4)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution logic for the MP3308DL-LF-P is determined by the following critical parameters:

Primary Substitution Criteria:

Topology: Step-Up (Boost) DC-DC regulation
Output voltage capability: 36V or higher
Dimming method: PWM control
Single output configuration
Internal switch integration
RoHS3 compliance and MSL-1 rating

Secondary Compatibility Factors:

Supply voltage range overlap (minimum 3V to 6V operation)
Output current capacity (1.33A or greater)
Operating temperature range (-40°C minimum, 125°C or higher maximum)
Surface mount packaging suitable for automated assembly

Substitutes are grouped by topology alignment and application suitability. Parts with identical topology and dimming method represent direct functional equivalents. Parts with alternative topologies (buck, buck-boost, or charge pump) are included when they meet output voltage and current requirements for backlight applications.

Parameter Comparison

Part Number	Manufacturer	Topology	Supply Min (V)	Supply Max (V)	Output Voltage (V)	Output Current (A)	Frequency (MHz)	Dimming	Package	Temp Range (°C)	Product Status
MP3308DL-LF-P	Monolithic Power Systems Inc.	Step-Up (Boost)	3	6	36	1.33	2.2	PWM	14-QFN (3x4)	-40 ~ 125	Active
AL8860WT-7	Diodes Incorporated	Step-Down (Buck)	4.5	40	36	1	1	Analog, PWM	SOT-23-5 (TSOT-25)	-40 ~ 105	Active
AP5724WUG-7	Diodes Incorporated	Step-Up (Boost)	2.7	5.5	—	0.75	1.2	PWM	SOT-23-6 (TSOT-23-6)	-40 ~ 85	Active
BD60A00NUX-TR	Rohm Semiconductor	Step-Up (Boost)	2.7	5.5	—	0.03	0.6	PWM	8-UFDFN (VSON008X2030)	-40 ~ 85	Not For New Designs
LM2758TL/NOPB	Texas Instruments	Switched Capacitor (Charge Pump)	2.7	5.5	2.7 ~ 5.3	0.7	1.25	—	12-DSBGA	-40 ~ 85	Active
LM3555TLX/NOPB	National Semiconductor	Step-Up (Boost)	2.5	5.5	9.96	0.5	2	I2C	12-DSBGA	-30 ~ 85	Active
LM3556TME/NOPB	Texas Instruments	Step-Up (Boost)	2.5	5.5	—	1.5	4	I2C	16-DSBGA	-40 ~ 85	Active
LM3561TME/NOPB	Texas Instruments	Step-Up (Boost)	2.5	5.5	—	0.6	2	I2C	12-DSBGA	-40 ~ 85	Active
LT3474IFE#PBF	Analog Devices Inc.	Step-Down (Buck)	4.6	36	—	1	0.2 ~ 2	PWM	16-TSSOP-EP	-40 ~ 125	Active
LT3478EFE-1#PBF	Analog Devices Inc.	Step-Down (Buck), Step-Up (Boost)	2.8	36	42	4.5	0.2 ~ 2.25	PWM	16-TSSOP-EP	-40 ~ 125	Active
LT3491EDC#TRPBF	Analog Devices Inc.	Step-Up (Boost)	2.5	12	27	0.26	2.3	PWM	6-DFN (2x2)	-40 ~ 85	Active

Engineering Selection Recommendations

Direct Topology Match (Step-Up Boost with PWM Dimming):

AP5724WUG-7 and LT3491EDC#TRPBF maintain identical topology and dimming methodology to the MP3308DL-LF-P. However, AP5724WUG-7 operates at reduced output current (750mA versus 1.33A) and lacks specified output voltage, limiting its applicability to lower-power backlight circuits. LT3491EDC#TRPBF similarly operates at 260mA output current with 27V maximum output, suitable only for reduced-power applications.

Alternative Topology with Extended Capability:

LT3478EFE-1#PBF provides buck-boost topology enabling both step-down and step-up operation across a 2.8V to 36V supply range with 42V output capability and 4.5A switch current. This part exceeds the MP3308DL-LF-P specifications in output current and voltage range, supporting higher-power backlight applications. Operating temperature range matches the primary part (-40°C to 125°C). RoHS3 compliance and MSL-1 rating are confirmed.

Buck Topology Alternatives:

AL8860WT-7 and LT3474IFE#PBF employ step-down (buck) topology, suitable only when input voltage exceeds desired output voltage. AL8860WT-7 operates across 4.5V to 40V supply with 1A output current and supports both analog and PWM dimming. LT3474IFE#PBF spans 4.6V to 36V supply with 1A output current and automotive-grade qualification. Both maintain -40°C to 125°C operating range and RoHS3 compliance.

I2C Dimming Variants:

LM3555TLX/NOPB, LM3556TME/NOPB, and LM3561TME/NOPB employ I2C digital dimming control instead of PWM. These parts support camera flash applications with output currents ranging from 500mA to 1.5A. LM3556TME/NOPB delivers the highest output current (1.5A) among I2C variants. All three maintain active product status and RoHS3 compliance.

Charge Pump Technology:

LM2758TL/NOPB utilizes switched capacitor (charge pump) topology, generating output voltage between 2.7V and 5.3V. This topology is unsuitable for 36V output requirements and is listed for camera flash applications rather than backlight.

Obsolescence Consideration:

BD60A00NUX-TR carries "Not For New Designs" status and delivers only 30mA output current, making it unsuitable for the MP3308DL-LF-P replacement in new applications.

Frequently Asked Questions (FAQ)

Q: Can AL8860WT-7 directly replace MP3308DL-LF-P in a backlight circuit?

A: AL8860WT-7 employs step-down (buck) topology, which requires input voltage higher than the desired 36V output. The MP3308DL-LF-P uses step-up (boost) topology to generate 36V from a 3V to 6V supply. AL8860WT-7 is suitable only when a higher input voltage source is available. Additionally, AL8860WT-7 output current is limited to 1A versus 1.33A for the primary part.

Q: What is the key difference between PWM and I2C dimming in LED driver ICs?

A: PWM (pulse-width modulation) dimming adjusts LED brightness by varying the duty cycle of a fixed-frequency switching signal, controlled via a dedicated PWM input pin. I2C dimming uses digital serial communication to set brightness levels, requiring microcontroller integration. The MP3308DL-LF-P uses PWM dimming; substitutes with I2C dimming (LM3555TLX/NOPB, LM3556TME/NOPB, LM3561TME/NOPB) require firmware modification and additional control circuitry.

Q: Is LT3478EFE-1#PBF a suitable substitute for higher-power backlight applications?

A: Yes. LT3478EFE-1#PBF provides buck-boost topology supporting both step-down and step-up operation, 4.5A output current (versus 1.33A), and 42V output capability (versus 36V). Operating temperature range (-40°C to 125°C) matches the primary part. RoHS3 compliance and MSL-1 rating are confirmed. This part is suitable for applications requiring higher output current or voltage than the MP3308DL-LF-P.

Q: Why is BD60A00NUX-TR not recommended as a substitute?

A: BD60A00NUX-TR carries "Not For New Designs" product status, indicating manufacturer discontinuation for new applications. Additionally, its 30mA output current is insufficient for the MP3308DL-LF-P's 1.33A requirement. This part is suitable only for legacy design maintenance.

Q: What packaging considerations apply when selecting a substitute?

A: The MP3308DL-LF-P uses 14-QFN (3x4) packaging. Substitutes employ different packages: AL8860WT-7 uses SOT-23-5, AP5724WUG-7 uses SOT-23-6, LM3555TLX/NOPB and LM3561TME/NOPB use 12-DSBGA, LM3556TME/NOPB uses 16-DSBGA, and LT3478EFE-1#PBF uses 16-TSSOP-EP. PCB layout modifications and requalification are required when changing packages. Thermal performance, trace routing, and component placement must be re-evaluated for each package type.

Q: Can LT3491EDC#TRPBF replace MP3308DL-LF-P in existing designs?

A: LT3491EDC#TRPBF maintains step-up (boost) topology and PWM dimming, but output current is limited to 260mA (versus 1.33A) and maximum output voltage is 27V (versus 36V). This part is suitable only for reduced-power backlight applications. Existing designs requiring full 1.33A output current and 36V output cannot use this substitute without circuit redesign.

Q: What compliance certifications should be verified when substituting parts?

A: All listed substitutes maintain RoHS3 compliance and MSL-1 (unlimited moisture sensitivity) rating, matching the MP3308DL-LF-P. REACH status is "REACH Unaffected" for all parts. ECCN classification is EAR99 for all parts. HTSUS code 8542.39.0001 applies uniformly. These certifications ensure regulatory equivalence for supply chain and export purposes.

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