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MP3309CGQG-Z LED Driver IC Equivalent & Substitute Parts
Part Overview
The MP3309CGQG-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 internal switching capability and PWM dimming control for backlight applications. The part is currently in Active product status with 33,300 units in stock.
Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, enabling direct replacement in circuit designs without functional degradation.
Substiute Parts
Key Parameters
| Parameter | MP3309CGQG-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 |
| Applications | Backlight |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Package / Case | 10-VFQFN |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| MSL | 1 (Unlimited) |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitute parts for the MP3309CGQG-Z are qualified based on the following critical parameters:
- Topology: Step-Up (Boost) DC DC Regulator
- Number of Outputs: 1
- Supply Voltage Range: 2.7V minimum to 5.5V maximum
- Dimming Capability: PWM support
- Application: Backlight
- Internal Switch: Yes
- RoHS Compliance: ROHS3 Compliant
Substitute parts must maintain compatibility across these core electrical and mechanical specifications. Parts are grouped by their ability to meet the input voltage range (2.7V–5.5V), output voltage capability, and PWM dimming functionality required for backlight LED driver applications.
Parameter Comparison
| Parameter | MP3309CGQG-Z | AP5724WG-7 | AP5725WG-7 | LM3530TME-40/NOPB | LT3491EDC#TRMPBF | LT3491ESC8#TRMPBF | LT3591EDDB#TRPBF | MAX1554ETA+T |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Monolithic Power Systems Inc. | Diodes Incorporated | Diodes Incorporated | Texas Instruments | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc./Maxim Integrated |
| Topology | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage Supply (Min) | 2.7V | 2.7V | 2.7V | 2.7V | 2.5V | 2.5V | 2.5V | 3.15V |
| Voltage Supply (Max) | 5.5V | 5.5V | 5.5V | 5.5V | 12V | 12V | 12V | 5.5V |
| Voltage Output | 35V | — | 26V | 40V | 27V | — | — | 40V |
| Frequency | 640kHz | 1.2MHz | 1.2MHz | 500kHz | 2.3MHz | 2.3MHz | 1MHz | — |
| Dimming | Analog, PWM | PWM | PWM | PWM | PWM | PWM | PWM | Analog, PWM |
| Applications | Backlight | Backlight | Backlight | Backlight | Backlight | Backlight | Backlight | Backlight |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TJ) | -40°C ~ 85°C (TA) |
| Package / Case | 10-VFQFN | SOT-23-6 | SOT-23-6 | 12-WFBGA, DSBGA | 6-WFDFN Exposed Pad | 8-VFSOP (0.049", 1.25mm Width) | 8-WFDFN Exposed Pad | 8-WDFN Exposed Pad |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active |
Engineering Selection Recommendations
All substitute parts listed maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the MP3309CGQG-Z.
Primary Substitutes (Closest Electrical Match):
MAX1554ETA+T and LM3530TME-40/NOPB provide output voltage ratings (40V) that exceed the MP3309CGQG-Z specification (35V), supporting higher voltage applications while maintaining the 2.7V–5.5V input range and PWM dimming capability.
Secondary Substitutes (Extended Supply Range):
LT3491EDC#TRMPBF, LT3491ESC8#TRMPBF, and LT3591EDDB#TRPBF accept extended supply voltage ranges (2.5V–12V), enabling use in applications requiring higher input voltage tolerance. These parts maintain PWM dimming and backlight application focus.
Package Considerations:
AP5724WG-7 and AP5725WG-7 offer compact SOT-23-6 packaging, reducing board footprint compared to the 10-VFQFN package of the original part. LT3491ESC8#TRMPBF provides SC-70-8 packaging for space-constrained designs.
Temperature Rating:
The MP3309CGQG-Z operates to 125°C junction temperature, exceeding the 85°C ambient temperature limit of most substitutes. Applications requiring sustained operation above 85°C ambient should confirm thermal performance with substitute part datasheets.
Frequently Asked Questions (FAQ)
Q: Can AP5724WG-7 or AP5725WG-7 directly replace MP3309CGQG-Z in existing PCB layouts?
A: No. The AP5724WG-7 and AP5725WG-7 use SOT-23-6 packaging, while the MP3309CGQG-Z uses 10-VFQFN packaging. PCB footprint redesign is required. However, electrical functionality is compatible for backlight LED driver applications within the 2.7V–5.5V supply range.
Q: What is the primary difference between LT3491EDC#TRMPBF and LT3491ESC8#TRMPBF?
A: Both are LT3491 base devices with identical electrical specifications (2.5V–12V supply, 2.3MHz frequency, PWM dimming). The primary difference is packaging: LT3491EDC#TRMPBF uses 6-DFN (2x2), while LT3491ESC8#TRMPBF uses SC-70-8. Package selection depends on board space and thermal requirements.
Q: Does MAX1554ETA+T support analog dimming like the MP3309CGQG-Z?
A: Yes. MAX1554ETA+T supports both Analog and PWM dimming modes, matching the MP3309CGQG-Z dimming capability. This provides design flexibility for backlight brightness control.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed are ROHS3 Compliant with MSL rating of 1 (Unlimited), matching the environmental and regulatory compliance of the MP3309CGQG-Z.
Q: Which substitute part has the highest output voltage capability?
A: LM3530TME-40/NOPB and MAX1554ETA+T both support 40V output voltage, exceeding the MP3309CGQG-Z 35V specification. These parts are suitable for applications requiring higher LED string voltages.
Q: Can LT3517HUF#PBF be used as a substitute?
A: LT3517HUF#PBF is classified as Obsolete and is not recommended for new designs. While it supports Step-Up (Boost) topology and backlight applications, its discontinued status limits long-term supply availability and support.
Q: What is the inventory status of substitute parts?
A: AP5724WG-7 has 16,500 units in stock. AP5725WG-7 has 3,816 units. LM3530TME-40/NOPB has 1,350 units. LT3491EDC#TRMPBF has 2,305 units. LT3491ESC8#TRMPBF has 1,886 units. LT3591EDDB#TRPBF has 21,680 units. MAX1554ETA+T has 1,522 units. Availability should be confirmed with suppliers for production quantities.
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