MP3305DD-LF-P LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP3305DD-LF-P is an active-status LED driver IC manufactured by Monolithic Power Systems Inc., designed for backlight applications. This device functions as a DC-DC regulator with step-up (boost) topology, delivering 1.33A switch current at 36V output from a 2.5V to 6V supply. The IC integrates PWM dimming control and operates across the -40°C to 85°C temperature range in an 8-QFN (2x3) surface-mount package.

Substitute parts become necessary when the MP3305DD-LF-P reaches end-of-life status, inventory constraints occur, or design requirements necessitate alternative electrical or mechanical characteristics. The following equivalent and recommended parts maintain functional compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value
Manufacturer Part Number	MP3305DD-LF-P
Manufacturer	Monolithic Power Systems Inc.
Product Category	Power Management (PMIC)
Device Type	DC DC Regulator
Topology	Step-Up (Boost)
Package / Case	8-TFDFN Exposed Pad
Supplier Device Package	8-QFN (2x3)
Voltage Supply (Min)	2.5V
Voltage Supply (Max)	6V
Voltage Output	36V
Current Output / Channel	1.33A (Switch)
Switching Frequency	2.2MHz
Dimming Control	PWM
Operating Temperature	-40°C ~ 85°C (TA)
Product Status	Active
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MP3305DD-LF-P are categorized based on electrical and mechanical compatibility within the following parameter constraints:

Primary Substitution Criteria:

Topology: Step-Up (Boost) DC-DC regulator with internal switch
Output Voltage: 36V nominal
Supply Voltage Range: 2.5V to 6V input tolerance
Output Current: 1.33A switch current capability
Dimming Method: PWM control
Package Type: 8-pin surface-mount (QFN or equivalent)
Temperature Range: -40°C to 85°C minimum
Compliance: ROHS3 and REACH requirements

Parametric Equivalent Parts maintain identical electrical specifications and package footprint, differing only in manufacturer or product status designation. These parts are direct functional replacements.

Manufacturer Recommended Parts offer alternative topologies, current ratings, or voltage specifications that satisfy backlight and lighting applications but require design verification for specific output voltage and current requirements.

Parameter Comparison

Part Number	Manufacturer	Topology	Voltage Supply (Min-Max)	Voltage Output	Current Output	Frequency	Package	Product Status
MP3305DD-LF-P	Monolithic Power Systems Inc.	Step-Up (Boost)	2.5V - 6V	36V	1.33A	2.2MHz	8-QFN (2x3)	Active
MP3304ADD-LF-P	Monolithic Power Systems	Step-Up (Boost)	3V - 6V	36V	1.33A	2.2MHz	8-QFN (2x3)	Not For New Designs
MP3304ADD-LF-Z	Monolithic Power Systems Inc.	Step-Up (Boost)	3V - 6V	36V	1.33A	2.2MHz	8-QFN (2x3)	Not For New Designs
MP3305DD-LF-Z	Monolithic Power Systems Inc.	Step-Up (Boost)	2.5V - 6V	36V	1.33A	2.2MHz	8-QFN (2x3)	Active
AL8860MP-13	Diodes Incorporated	Step-Down (Buck)	4.5V - 40V	36V	1.5A	1MHz	8-MSOP-EP	Active
BD6072HFN-TR	Rohm Semiconductor	Step-Up (Boost)	2.7V - 5.5V	18V	35mA	1MHz	8-HSON	Not For New Designs
LM3404MRX/NOPB	Texas Instruments	Step-Down (Buck)	6V - 42V	40V	1A	1MHz	8-SO PowerPad	Active
LM3508TLX/NOPB	Texas Instruments	Step-Up (Boost)	2.7V - 5.5V	17.5V	30mA	850kHz	9-DSBGA	Active
LM3519MK-20/NOPB	National Semiconductor	Step-Up (Boost)	2.7V - 5.5V	20V	20mA	5.4MHz	TSOT-23-6	Active
LM3530UME-40/NOPB	Texas Instruments	Step-Up (Boost)	2.7V - 5.5V	40V	30mA	500kHz	12-DSBGA	Active
LM3565TLX/NOPB	Texas Instruments	Step-Up (Boost)	2.5V - 5.5V	5.5V - 8.5V	930mA (Flash)	4MHz	16-DSBGA (2.5x2.12)	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents):

MP3305DD-LF-Z is the recommended parametric equivalent to MP3305DD-LF-P. Both devices maintain identical electrical specifications (2.5V-6V input, 36V output, 1.33A switch current, 2.2MHz frequency, PWM dimming) and package configuration (8-QFN 2x3). Both hold active product status and ROHS3 compliance. The primary distinction is packaging designation (tape & reel versus bulk), which does not affect functional performance.

MP3304ADD-LF-P and MP3304ADD-LF-Z are parametric equivalents with one electrical constraint: minimum supply voltage is 3V rather than 2.5V. These parts are designated "Not For New Designs" and should be selected only when existing inventory requirements or legacy design constraints mandate their use. Both maintain 36V output, 1.33A current, and 8-QFN packaging.

Alternative Selections (Manufacturer Recommended):

AL8860MP-13 (Diodes Incorporated) operates as a step-down (buck) topology rather than step-up, requiring higher input voltage (4.5V minimum) but delivering slightly higher output current (1.5A). This part is suitable for applications where input voltage exceeds 4.5V and step-down regulation is acceptable. Active product status and ROHS3 compliance are confirmed.

LM3404MRX/NOPB (Texas Instruments) is a step-down buck regulator rated for automotive-grade operation (-40°C to 125°C junction temperature). It requires 6V minimum input and delivers 1A output current. This part is appropriate for automotive backlight applications requiring extended temperature range and automotive qualification.

LM3508TLX/NOPB (Texas Instruments) is a step-up boost regulator with significantly lower output current (30mA) and output voltage (17.5V). Selection is limited to low-power backlight applications where these reduced specifications are acceptable.

LM3530UME-40/NOPB (Texas Instruments) is a step-up boost regulator delivering 40V output at 30mA current. This part accommodates higher output voltage requirements but with reduced current capacity.

LM3565TLX/NOPB (Texas Instruments) is a step-up boost regulator optimized for camera flash applications, delivering 930mA flash current at 5.5V-8.5V output. This part is not suitable for 36V backlight applications.

LM3519MK-20/NOPB (National Semiconductor) is a step-up boost regulator with 20V output and 20mA current, suitable only for low-power backlight applications.

BD6072HFN-TR (Rohm Semiconductor) is a step-up boost regulator with 18V output and 35mA current, designated "Not For New Designs." This part is unsuitable for 36V output requirements.

Frequently Asked Questions (FAQ)

Q: Can MP3305DD-LF-Z directly replace MP3305DD-LF-P without circuit modification?

A: Yes. MP3305DD-LF-Z is a parametric equivalent with identical electrical specifications and 8-QFN (2x3) package footprint. No circuit modifications are required. The difference is packaging format (tape & reel designation).

Q: What is the minimum supply voltage difference between MP3305DD-LF-P and MP3304ADD-LF-P?

A: MP3305DD-LF-P operates from 2.5V minimum input, while MP3304ADD-LF-P requires 3V minimum. If your application uses supply voltages between 2.5V and 3V, only MP3305DD-LF-P or MP3305DD-LF-Z are suitable. MP3304ADD variants will not function reliably below 3V.

Q: Why are some substitute parts listed as "Not For New Designs"?

A: Parts designated "Not For New Designs" are in end-of-life or mature phase. Manufacturers recommend against incorporating these parts into new product designs due to potential future unavailability. They are listed for reference only when legacy design maintenance or existing inventory constraints require their use.

Q: Can AL8860MP-13 replace MP3305DD-LF-P in a backlight circuit?

A: AL8860MP-13 uses step-down (buck) topology instead of step-up (boost), requiring minimum 4.5V input voltage. If your power source is 4.5V or higher and step-down regulation is acceptable for your backlight voltage requirements, AL8860MP-13 is functionally viable. However, circuit redesign is necessary; direct pin-for-pin replacement is not possible due to different package types (8-MSOP-EP versus 8-QFN).

Q: What output voltage and current specifications must a substitute part maintain?

A: For direct functional equivalence to MP3305DD-LF-P, substitute parts must deliver 36V output at 1.33A switch current minimum. Parts with lower output voltage (such as LM3508TLX/NOPB at 17.5V) or lower current (30mA) are not suitable for applications requiring full 36V/1.33A specifications.

Q: Are all listed substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of MP3305DD-LF-P.

Q: What is the package footprint compatibility between MP3305DD-LF-P and alternative parts?

A: MP3305DD-LF-P uses 8-QFN (2x3) footprint. MP3304ADD variants use identical 8-QFN (2x3) footprint and are directly compatible. AL8860MP-13 uses 8-MSOP-EP (different footprint), LM3508TLX/NOPB uses 9-DSBGA, and LM3530UME-40/NOPB uses 12-DSBGA. These alternatives require PCB redesign and are not pin-compatible.

Q: Which substitute part has the widest input voltage range?

A: LM3404MRX/NOPB accepts 6V to 42V input, providing the widest supply voltage tolerance. However, this part uses step-down topology and requires circuit redesign. For step-up topology matching MP3305DD-LF-P function, MP3305DD-LF-Z maintains the 2.5V to 6V input range.

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