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FAN5340MPX LED Driver IC Equivalent & Substitute Parts
Part Overview
The FAN5340MPX is an LED Driver IC manufactured by onsemi, designed as a 1-output DC-DC regulator with step-up (boost) topology and PWM dimming capability. This device operates at 1.2MHz with a 40mA output current rating and is housed in an 8-MLP (3x3) package. The FAN5340MPX is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across input voltage range, output voltage capability, dimming control method, and thermal operating specifications.
Substiute Parts
Key Parameters
| Parameter | FAN5340MPX |
|---|---|
| Manufacturer | onsemi |
| Product Status | Obsolete |
| Type | DC DC Regulator |
| Topology | Step-Up (Boost) |
| Number of Outputs | 1 |
| Voltage - Supply (Min) | 2.7V |
| Voltage - Supply (Max) | 4.8V |
| Voltage - Output | 6.2V ~ 16V |
| Current - Output / Channel | 40mA |
| Frequency | 1.2MHz |
| Dimming | PWM |
| Applications | Backlight |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 8-WDFN Exposed Pad |
| Mounting Type | Surface Mount |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the FAN5340MPX is determined by the following critical parameters:
Primary Compatibility Criteria:
- Topology: Step-Up (Boost) DC-DC regulator
- Dimming Control: PWM capability
- Input Voltage Range: Minimum 2.7V supply capability
- Output Voltage Range: Minimum 6.2V to 16V output capability
- Current Rating: Minimum 40mA output current
- Operating Temperature: -40°C to 85°C range
- Mounting Type: Surface Mount
- Applications: Backlight LED driver functionality
Substitute parts are grouped into two categories:
Direct Substitutes (Functional Equivalents): Parts meeting all primary compatibility criteria with identical or superior electrical specifications and active product status.
Similar Substitutes (Functional Alternatives): Parts with step-up boost topology and PWM dimming that may have different package types, current ratings, or voltage ranges but maintain core LED driver functionality for backlight applications.
Parameter Comparison
| Parameter | FAN5340MPX | FAN5333ASX | AP5724WG-7 | AP5725WG-7 | LM3530UMX-25A/NOPB | LM3565TLE/NOPB | LT1932ES6#TRMPBF | LT3478IFE-1#PBF | LT3491EDC#TRMPBF | LT3498EDDB#TRMPBF | LT3517EFE#PBF |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | onsemi | Diodes Inc. | Diodes Inc. | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| Topology | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Down (Buck), Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Down (Buck), Step-Up (Boost) |
| Voltage - Supply (Min) | 2.7V | 1.8V | 2.7V | 2.7V | 2.7V | 2.5V | 1V | 2.8V | 2.5V | 2.5V | 3V |
| Voltage - Supply (Max) | 4.8V | 5.5V | 5.5V | 5.5V | 5.5V | 5.5V | 10V | 36V | 12V | 12V | 30V |
| Voltage - Output | 6.2V ~ 16V | 30V | Not Specified | 26V | 40V | 5.5V ~ 8.5V | 36V | 42V | 27V | 32V | Not Specified |
| Current - Output / Channel | 40mA | 1.5A (Switch) | 750mA (Switch) | 750mA (Switch) | 30mA | 930mA (Flash) | 40mA | 4.5A (Switch) | 260mA (Switch) | 20mA | 1.5A (Switch) |
| Frequency | 1.2MHz | 1.5MHz | 1.2MHz | 1.2MHz | 500kHz | 4MHz | 1.2MHz | 200kHz ~ 2.25MHz | 2.3MHz | 2.3MHz | 250kHz ~ 2.5MHz |
| Dimming | PWM | Analog, PWM | PWM | PWM | PWM | PWM | PWM | PWM | PWM | Analog, PWM | Analog, PWM |
| Operating Temperature | -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) | -30°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TJ) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TJ) | -40°C ~ 125°C (TJ) |
| Package / Case | 8-WDFN Exposed Pad | SC-74A, SOT-753 | SOT-23-6 | SOT-23-6 | 12-XFBGA, DSBGA | 16-WFBGA, DSBGA | SOT-23-6 Thin, TSOT-23-6 | 16-TSSOP (0.173", 4.40mm Width) Exposed Pad | 6-WFDFN Exposed Pad | 12-WFDFN Exposed Pad | 16-TSSOP (0.173", 4.40mm Width) Exposed Pad |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | Not Specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Direct Substitute Priority:
FAN5333ASX (onsemi) is the primary direct substitute. It maintains onsemi manufacturer continuity, operates with active product status, and provides step-up boost topology with PWM dimming. The FAN5333ASX accepts input voltage from 1.8V to 5.5V (exceeding the FAN5340MPX minimum requirement of 2.7V) and delivers output voltage to 30V. Current capability is rated at 1.5A switch current, significantly exceeding the 40mA requirement. Operating temperature range matches at -40°C to 85°C. The device is ROHS3 compliant with MSL 1 rating. Package change from 8-MLP to SOT-23-5 requires PCB layout modification.
Secondary Substitutes with Active Status:
AP5724WG-7 and AP5725WG-7 (Diodes Incorporated) provide step-up boost topology with PWM dimming and 1.2MHz switching frequency matching the original. Both accept 2.7V to 5.5V input and deliver 750mA switch current. AP5725WG-7 specifies 26V output voltage. Operating temperature and MSL ratings align with FAN5340MPX. ROHS3 compliance confirmed. Package is SOT-23-6, requiring layout redesign.
LM3530UMX-25A/NOPB (Texas Instruments) offers step-up boost topology with PWM dimming, 2.7V to 5.5V input range, and 40V output capability. Current rating is 30mA, slightly below the 40mA specification. Frequency is 500kHz. Package is 12-DSBGA, requiring significant layout changes. ROHS3 compliant with active status.
LT1932ES6#TRMPBF (Analog Devices) provides step-up boost topology with PWM dimming, 1.2MHz frequency, and 40mA current rating matching the original. Input range extends from 1V to 10V, and output reaches 36V. Operating temperature extends to 85°C. ROHS3 compliant with active status. Package is TSOT-23-6, requiring layout modification.
LT3478IFE-1#PBF (Analog Devices) offers dual topology (step-down/step-up) with PWM dimming and 4.5A switch current. Input range is 2.8V to 36V with 42V output capability. Frequency is programmable from 200kHz to 2.25MHz. Operating temperature extends to 125°C (TJ). ROHS3 compliant. Package is 16-TSSOP-EP, requiring significant layout redesign.
LT3491EDC#TRMPBF (Analog Devices) provides step-up boost topology with PWM dimming, 2.5V to 12V input, and 27V output. Switch current is 260mA at 2.3MHz. Operating temperature is -40°C to 85°C. ROHS3 compliant with active status. Package is 6-DFN (2x2), requiring layout modification.
LT3498EDDB#TRMPBF (Analog Devices) offers step-up boost topology with analog and PWM dimming, 2.5V to 12V input, and 32V output. Current rating is 20mA at 2.3MHz. Operating temperature extends to 85°C (TJ). ROHS3 compliant. Package is 12-DFN (3x2), requiring layout redesign.
LT3517EFE#PBF (Analog Devices) provides dual topology (step-down/step-up) with analog and PWM dimming, 1.5A switch current, and 3V to 30V input range. Frequency is programmable from 250kHz to 2.5MHz. Operating temperature extends to 125°C (TJ). ROHS3 compliant with active status. Package is 16-TSSOP-EP, requiring significant layout modification.
LM3565TLE/NOPB (Texas Instruments) is optimized for camera flash applications with 930mA flash current, 4MHz frequency, and 5.5V to 8.5V output range. Input is 2.5V to 5.5V. Operating temperature is -30°C to 85°C (narrower low-temperature range). ROHS3 compliant. Package is 16-DSBGA, requiring layout redesign. Application focus differs from backlight primary use.
All substitute parts carry REACH Unaffected and EAR99 ECCN classifications matching the original device.
Frequently Asked Questions (FAQ)
Q: Can FAN5333ASX directly replace FAN5340MPX without design changes?
A: FAN5333ASX provides electrical compatibility across all critical parameters: step-up boost topology, PWM dimming, 2.7V minimum input voltage, and 40mA+ current capability. However, package change from 8-MLP to SOT-23-5 requires PCB layout modification, including trace routing and component placement adjustments. Thermal management design may differ due to package geometry changes.
Q: What is the primary difference between direct and similar substitutes?
A: Direct substitutes maintain the same manufacturer (onsemi) and provide closest electrical and thermal specifications. Similar substitutes from other manufacturers (Diodes, Texas Instruments, Analog Devices) offer equivalent functionality but may require more extensive design validation due to different package types, frequency characteristics, or topology variations.
Q: Are all substitute parts ROHS3 compliant?
A: All listed substitute parts carry ROHS3 compliance certification. The original FAN5340MPX does not specify RoHS status due to its obsolete classification. All substitutes maintain MSL 1 (Unlimited) moisture sensitivity level, matching the original specification.
Q: Which substitute best matches the original 40mA current specification?
A: LT1932ES6#TRMPBF provides exact 40mA current rating with matching 1.2MHz frequency and PWM dimming. FAN5333ASX and LT3517EFE#PBF exceed this specification with 1.5A switch current capability, providing design margin. LM3530UMX-25A/NOPB rates 30mA, falling slightly below the 40mA requirement.
Q: How do package changes affect substitution feasibility?
A: Package changes require PCB layout redesign, including trace routing, via placement, and component spacing modifications. Thermal performance may vary due to different exposed pad sizes and package geometries. Mechanical fit within existing enclosures must be verified. Electrical performance remains unaffected if layout design follows manufacturer guidelines for each package type.
Q: Can substitutes with higher output voltage ratings be used in designs requiring 6.2V to 16V output?
A: Yes. Substitutes with higher maximum output voltage (such as LT3478IFE-1#PBF at 42V or LT3517EFE#PBF with unspecified maximum) can be configured to deliver the required 6.2V to 16V range through external feedback resistor networks. Design validation must confirm output voltage regulation accuracy within the target range.
Q: Which substitutes support extended operating temperature ranges?
A: LT3478IFE-1#PBF, LT3517EFE#PBF, and LT3491EDC#TRMPBF extend operating temperature to 125°C (TJ), compared to the original 85°C (TA) specification. This provides thermal margin for high-ambient or high-power applications. All other substitutes maintain the -40°C to 85°C range matching the original device.
Q: Are dual-topology devices (step-down/step-up) suitable for boost-only applications?
A: Yes. LT3478IFE-1#PBF and LT3517EFE#PBF support both step-down and step-up operation but can be configured for step-up (boost) mode exclusively. Design must ensure feedback network and control pin configuration select boost topology. Dual-topology devices provide design flexibility for future applications requiring buck-boost capability.
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