MP3309AGQ-Z LED Driver IC Equivalent & Substitute Parts

Part Overview

The MP3309AGQ-Z 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 Step-Up (Boost) topology, featuring analog and PWM dimming capabilities. The part operates across a 2.7V to 5.5V supply range with a 35V output specification and is housed in a 10-QFN (3x3) package.

The MP3309AGQ-Z maintains Active product status with 20,300 units in current inventory. Substitute parts are identified when equivalent electrical performance, package compatibility, and operational parameters align with the original specification, enabling direct replacement in applications where the primary part becomes unavailable or when design flexibility is required.

Key Parameters

Parameter	Value
Manufacturer Part Number	MP3309AGQ-Z
Manufacturer	Monolithic Power Systems Inc.
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	1
Voltage - Supply (Min)	2.7V
Voltage - Supply (Max)	5.5V
Voltage - Output	35V
Frequency	640kHz
Dimming	Analog, PWM
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	10-VFDFN Exposed Pad
Supplier Device Package	10-QFN (3x3)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the MP3309AGQ-Z are identified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Topology: Step-Up (Boost) DC-DC Regulator
Number of Outputs: 1
Supply Voltage Range: Minimum 2.7V, Maximum 5.5V (or compatible overlap)
Output Voltage: 35V or higher capability
Dimming Control: Analog and/or PWM support
Internal Switch: Present
Operating Temperature: -40°C minimum to 85°C or higher
Package Type: Surface Mount with exposed pad variants
RoHS3 Compliance: Required
Product Status: Active or equivalent availability

Substitutes are grouped into two categories based on topology alignment and electrical performance:

Group 1: Step-Up (Boost) Topology - Direct Functional Equivalents Parts maintaining identical Step-Up topology with compatible voltage ranges and dimming methods: LM3565TLX/NOPB, LT3491ESC8#TRPBF, LM3530UME-25A/NOPB, LT3591EDDB#TRMPBF, MCP1662T-E/OT, AP5724FDCG-7, ADP1650ACPZ-R7, LTC3490EDD#PBF

Group 2: Multi-Topology Capability - Extended Flexibility Parts supporting both Step-Down and Step-Up topologies with broader voltage and current handling: LT3478EFE#PBF

Group 3: Alternative Topology - Application-Specific Consideration Parts with Step-Down topology for specific lighting applications: CAV4201TD-GT3

Parameter Comparison

Part Number	Manufacturer	Topology	Supply Min	Supply Max	Output Voltage	Dimming	Package	Temp Range	Product Status
MP3309AGQ-Z	MPS	Step-Up (Boost)	2.7V	5.5V	35V	Analog, PWM	10-QFN (3x3)	-40°C ~ 125°C	Active
LM3565TLX/NOPB	Texas Instruments	Step-Up (Boost)	2.5V	5.5V	5.5V ~ 8.5V	PWM	16-DSBGA (2.5x2.12)	-30°C ~ 85°C	Active
LT3491ESC8#TRPBF	Analog Devices Inc.	Step-Up (Boost)	2.5V	12V	-	PWM	SC-70-8	-40°C ~ 85°C	Active
LM3530UME-25A/NOPB	Texas Instruments	Step-Up (Boost)	2.7V	5.5V	40V	PWM	12-DSBGA	-40°C ~ 85°C	Active
LT3591EDDB#TRMPBF	Analog Devices Inc.	Step-Up (Boost)	2.5V	12V	-	PWM	8-DFN (3x2)	-40°C ~ 85°C	Active
MCP1662T-E/OT	Microchip Technology	Step-Up (Boost)	2.4V	5.5V	32V	PWM	SOT-23-5	-40°C ~ 125°C	Active
AP5724FDCG-7	Diodes Incorporated	Step-Up (Boost)	2.7V	5.5V	-	PWM	U-DFN2020-6 (Type C)	-40°C ~ 85°C	Active
ADP1650ACPZ-R7	Analog Devices Inc.	Step-Up (Boost)	2.7V	5V	4.575V ~ 5.5V	I2C	10-LFCSP-WD (3x3)	-40°C ~ 85°C	Active
LTC3490EDD#PBF	Analog Devices Inc.	Step-Up (Boost)	1V	3.2V	2.8V ~ 4V	Analog	8-DFN (3x3)	-40°C ~ 85°C	Active
LT3478EFE#PBF	Analog Devices Inc.	Step-Down (Buck), Step-Up (Boost)	2.8V	36V	42V	PWM	16-TSSOP-EP	-40°C ~ 125°C	Active
CAV4201TD-GT3	onsemi	Step-Down (Buck)	6.5V	36V	36V	Analog	TSOT-23-5	-40°C ~ 125°C	Last Time Buy

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

LM3530UME-25A/NOPB and LM3565TLX/NOPB from Texas Instruments represent the closest functional equivalents. Both maintain Step-Up topology, operate within the 2.5V to 5.5V supply range, support PWM dimming, and carry Active product status with ROHS3 compliance. LM3530UME-25A/NOPB specifically matches the 40V output capability, while LM3565TLX/NOPB provides 930mA flash current for camera flash applications.

MCP1662T-E/OT from Microchip Technology offers identical supply voltage range (2.4V to 5.5V), 32V output capability, PWM dimming, and extends the operating temperature to -40°C to 125°C, matching the original part's thermal specification. This part maintains Active status and ROHS3 compliance.

Secondary Substitutes (Functional Equivalence with Trade-offs):

LT3491ESC8#TRPBF and LT3591EDDB#TRMPBF from Analog Devices Inc. provide Step-Up topology with PWM dimming but operate at reduced maximum supply voltage (12V) and lower temperature range (-40°C to 85°C). These parts are suitable for applications not requiring the full 35V output or extended temperature operation.

AP5724FDCG-7 from Diodes Incorporated matches the 2.7V to 5.5V supply range and PWM dimming but is packaged in a smaller 6-DFN form factor with 750mA switch current, appropriate for space-constrained backlight applications.

Extended Flexibility Option:

LT3478EFE#PBF from Analog Devices Inc. supports both Step-Down and Step-Up topologies with 42V output capability and 4.5A switch current, providing broader design flexibility. Operating temperature extends to -40°C to 125°C with ROHS3 compliance and Active status.

Alternative Topology Consideration:

CAV4201TD-GT3 from onsemi operates as a Step-Down (Buck) regulator with 350mA output and analog dimming. This part carries Last Time Buy status and is not recommended for new designs requiring long-term supply assurance.

Compliance and Availability:

All recommended primary and secondary substitutes maintain ROHS3 compliance, MSL-1 rating (unlimited moisture sensitivity), and Active product status. Inventory levels range from 1,525 to 5,420 units across substitute options, ensuring supply continuity.

Frequently Asked Questions (FAQ)

Q: Can LM3530UME-25A/NOPB directly replace MP3309AGQ-Z in existing designs?

A: LM3530UME-25A/NOPB maintains compatible Step-Up topology, identical 2.7V to 5.5V supply range, and 40V output capability. However, the package differs (12-DSBGA versus 10-QFN), requiring PCB layout modification. Dimming control is PWM-only, whereas MP3309AGQ-Z supports both analog and PWM. Verify dimming method compatibility before substitution.

Q: What is the key difference between LM3565TLX/NOPB and LM3530UME-25A/NOPB?

A: LM3565TLX/NOPB is optimized for camera flash applications with 930mA flash current and 4MHz switching frequency, producing 5.5V to 8.5V output. LM3530UME-25A/NOPB targets backlight applications with 30mA output current and 500kHz frequency, producing 40V output. Select based on application requirements and output voltage specification.

Q: Why is CAV4201TD-GT3 listed if it uses Step-Down topology instead of Step-Up?

A: CAV4201TD-GT3 is included as an alternative for lighting applications where input voltage exceeds 6.5V and step-down regulation is acceptable. This part is marked Last Time Buy status and is not recommended for new designs. Use only if existing designs mandate step-down topology and supply continuity is not critical.

Q: Does ADP1650ACPZ-R7 provide equivalent functionality despite I2C dimming instead of PWM?

A: ADP1650ACPZ-R7 maintains Step-Up topology and 2.7V to 5V supply range but uses I2C digital dimming control instead of analog/PWM. Output voltage is limited to 4.575V to 5.5V, significantly lower than MP3309AGQ-Z's 35V specification. This part is suitable only for camera flash applications requiring I2C control and lower output voltage.

Q: What package considerations apply when substituting with AP5724FDCG-7?

A: AP5724FDCG-7 uses U-DFN2020-6 (Type C) packaging, a smaller form factor than MP3309AGQ-Z's 10-QFN (3x3). This requires PCB redesign with modified footprint and trace routing. The 750mA switch current is lower than typical MP3309AGQ-Z applications. Verify thermal management and current requirements before layout modification.

Q: Is LTC3490EDD#PBF suitable as a substitute?

A: LTC3490EDD#PBF operates at significantly lower voltage ranges (1V to 3.2V input, 2.8V to 4V output) compared to MP3309AGQ-Z (2.7V to 5.5V input, 35V output). This part is designed for low-voltage, low-power applications and is not functionally equivalent for standard LED driver applications requiring 35V output.

Q: Which substitute offers the best thermal performance?

A: MCP1662T-E/OT and LT3478EFE#PBF both extend operating temperature to -40°C to 125°C, matching MP3309AGQ-Z's thermal specification. MCP1662T-E/OT is optimized for backlight and camera flash with 32V output. LT3478EFE#PBF provides dual topology (buck/boost) with 42V output and 4.5A switch current for higher-power applications.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL-1 rating. Compliance certifications are equivalent across all options, ensuring regulatory equivalence for applications requiring ROHS3 certification.

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