Request Quote
(Ships tomorrow)
LM3552SDX LED Driver IC Equivalent & Substitute Parts
Part Overview
The LM3552SDX is a Texas Instruments LED Driver IC designed for camera flash applications. It functions as a 1-output DC-DC step-up (boost) regulator with 1A flash current capability, operating from a 2.7V to 5.5V supply. The device is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. Alternative parts must maintain functional equivalence in topology, output configuration, and thermal operating range while meeting current availability and compliance standards.
Substiute Parts
Key Parameters
| Parameter | LM3552SDX Value |
|---|---|
| Manufacturer | Texas Instruments |
| 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 |
| Current Output / Channel | 1A (Flash) |
| Frequency | 1.25MHz |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 14-WFDFN Exposed Pad |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution of the LM3552SDX is determined by the following critical parameters:
Primary Substitution Criteria:
- Topology: Step-Up (Boost) regulator with internal switch
- Number of Outputs: Single output configuration
- Supply Voltage Range: Minimum 2.7V input capability
- Current Capability: Minimum 1A output current (flash or switch rating)
- Operating Temperature: -40°C to 85°C minimum range
- Mounting Type: Surface mount package
Secondary Considerations:
- Product Status: Active status preferred for long-term availability
- RoHS Compliance: ROHS3 compliant parts recommended for new designs
- Frequency: Operating frequency in the 1MHz to 1.3MHz range acceptable
- Package Type: Alternative packages acceptable if electrical performance maintained
Substitute parts are grouped by their ability to meet these core electrical and thermal specifications while providing active product status and improved compliance posture compared to the obsolete LM3552SDX.
Parameter Comparison
| Parameter | LM3552SDX | IS31BL3508A-STLS2-TR | LT3478EFE-1#TRPBF | LT3519EMS-1#TRPBF | LTC3490ES8#PBF | MAX1848ETA+T | MIC2282YMM-TR | MP3202DG-LF-Z | MP3205DJ-LF-Z | RT8473GJ5 |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Lumissil Microsystems | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc./Maxim | Microchip Technology | Monolithic Power Systems | Monolithic Power Systems | Richtek USA Inc. |
| Topology | Step-Up (Boost) | Step-Up (Boost) | Step-Down (Buck), Step-Up (Boost) | SEPIC, Step-Down (Buck), Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Down (Buck) |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage Supply (Min) | 2.7V | 2.7V | 2.8V | 3V | 1V | 2.6V | 0.9V | 2.5V | 2.5V | 7V |
| Voltage Supply (Max) | 5.5V | 5.5V | 36V | 30V | 3.2V | 5.5V | 15V | 6V | 6V | 30V |
| Current Output / Channel | 1A (Flash) | 1.6A (Switch) | 4.5A (Switch) | 750mA (Switch) | 350mA | 750mA (Switch) | 1.1A (Switch) | 1.33A (Switch) | 350mA (Switch) | 1A |
| Frequency | 1.25MHz | 1MHz | 200kHz ~ 2.25MHz | 1MHz | 1.3MHz | 1.2MHz | 20kHz | 1.3MHz | 1.3MHz | - |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TJ) | -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 ~ 125°C (TJ) |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
IS31BL3508A-STLS2-TR and MIC2282YMM-TR provide the closest electrical alignment to the LM3552SDX. Both maintain step-up boost topology, single output configuration, 2.7V minimum supply voltage, and -40°C to 85°C operating range. IS31BL3508A-STLS2-TR offers 1.6A switch current with active product status and ROHS3 compliance. MIC2282YMM-TR provides 1.1A switch current with extended supply voltage range (0.9V to 15V) and active status.
Secondary Substitutes (Functional Equivalence with Trade-offs):
MP3202DG-LF-Z and MP3205DJ-LF-Z are Monolithic Power Systems boost regulators with active status and ROHS3 compliance. MP3202DG-LF-Z delivers 1.33A switch current at 1.3MHz frequency. MP3205DJ-LF-Z provides 350mA switch current in a compact TSOT-23-5 package. Both support analog and PWM dimming.
MAX1848ETA+T (Analog Devices/Maxim) operates as a step-up boost regulator with 750mA switch current, 2.6V to 5.5V supply range, and 1.2MHz frequency. Active product status and ROHS3 compliance are confirmed.
Topology Variants (Extended Application Range):
LT3478EFE-1#TRPBF and LT3519EMS-1#TRPBF support multiple topologies (buck-boost configurations) with higher current ratings and extended temperature ranges (-40°C to 125°C). These parts accommodate broader input voltage ranges and are suitable for applications requiring topology flexibility.
Not Recommended for Direct Substitution:
RT8473GJ5 operates as a step-down (buck) regulator with 7V minimum supply voltage, making it unsuitable for the 2.7V to 5.5V input range of the LM3552SDX. LTC3490ES8#PBF has a 1V to 3.2V supply range with 350mA output current, limiting applicability to low-power scenarios.
Frequently Asked Questions (FAQ)
Q: Can IS31BL3508A-STLS2-TR directly replace LM3552SDX in existing designs?
A: IS31BL3508A-STLS2-TR maintains compatible supply voltage range (2.7V to 5.5V), single output configuration, and step-up boost topology. The 1.6A switch current exceeds the 1A flash rating of the LM3552SDX. Package differences (SOT-23-6 versus 14-WFDFN) require PCB layout modification. Electrical performance is compatible; physical integration requires redesign.
Q: What is the difference between flash current and switch current ratings?
A: Flash current represents peak output current during brief high-intensity pulses, typical for camera flash applications. Switch current indicates the maximum continuous or sustained current the internal switching element can handle. The LM3552SDX specifies 1A flash current; substitute parts often list switch current ratings, which represent sustained capability and are generally more conservative specifications.
Q: Why do some substitutes have higher operating temperature ranges?
A: Parts rated to -40°C to 125°C (junction temperature) provide extended thermal margin compared to -40°C to 85°C (ambient temperature) specifications. Higher temperature ratings indicate enhanced thermal performance and are suitable for applications with elevated ambient conditions or high-density PCB layouts. The LM3552SDX ambient rating is adequate for standard industrial applications.
Q: Is RoHS3 compliance mandatory for substitution?
A: RoHS3 compliance is not mandatory for direct electrical substitution but is strongly recommended for new designs and long-term supply chain sustainability. All active substitute parts listed are ROHS3 compliant, whereas the obsolete LM3552SDX is RoHS non-compliant. Compliance status affects regulatory acceptance and component availability in regulated markets.
Q: Can MP3205DJ-LF-Z substitute for LM3552SDX despite lower current rating?
A: MP3205DJ-LF-Z provides 350mA switch current, significantly below the 1A flash rating of the LM3552SDX. Substitution is valid only for applications requiring less than 350mA output current. The part maintains compatible supply voltage range (2.5V to 6V), step-up boost topology, and 1.3MHz frequency. Package size (TSOT-23-5) is more compact than the original 14-WFDFN.
Q: What packaging considerations apply when selecting a substitute?
A: The LM3552SDX uses 14-WFDFN (4x4mm) exposed pad packaging. Substitute parts employ various packages: SOT-23-6, 16-TSSOP-EP, 16-MSOP, 8-SOIC, 8-TDFN, 8-MSOP, 8-QFN, and TSOT-23-5. Package selection affects PCB footprint, thermal dissipation, and board space requirements. Smaller packages (8-pin and 5-pin variants) reduce board area but may limit thermal performance in high-current applications.
Q: Are there substitutes suitable for camera flash applications specifically?
A: The LM3552SDX was designed for camera flash with 1A flash current capability. IS31BL3508A-STLS2-TR and MIC2282YMM-TR maintain boost topology and current ratings suitable for flash applications. However, substitute parts are often optimized for backlight or general lighting applications. Verification of flash pulse characteristics (rise time, peak current, duration) is necessary to confirm suitability for camera flash circuits.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts