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LM3553SD/NOPB LED Driver IC Equivalent & Substitute Parts
Part Overview
The LM3553SD/NOPB is an active LED Driver IC manufactured by Texas Instruments, designed for step-up (boost) DC-DC regulation with I2C dimming control. This single-output regulator delivers 1.2A flash current and operates across a 2.7V to 5.5V supply range, making it suitable for backlight and camera flash applications. The part is ROHS3 compliant and currently in active production status with 678 units in stock.
Substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, lead time considerations, or application-specific performance needs while maintaining functional compatibility within the LED driver category.
Substiute Parts
Key Parameters
| Parameter | LM3553SD/NOPB |
|---|---|
| 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 | 1.2A (Flash) |
| Frequency | 1.2MHz |
| Dimming Control | I2C |
| Operating Temperature | -30°C ~ 85°C (TA) |
| Package / Case | 12-WFDFN Exposed Pad |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 3 (168 Hours) |
Substitute Part Grouping Explanation
Substitute parts for the LM3553SD/NOPB are classified based on the following critical parameters that determine functional compatibility:
Primary Substitution Criteria:
- Topology: Step-Up (Boost) DC-DC Regulator
- Single Output Configuration
- Supply Voltage Range Overlap: Minimum 2.7V to 5.5V compatibility
- Current Delivery Capability: 1.2A or greater for flash/switch applications
- Dimming Control Method: I2C, PWM, or Analog dimming
- Operating Temperature Range: -30°C to 85°C or broader
- Surface Mount Packaging with Exposed Pad
Grouping Logic:
Group 1 - Direct Parametric Equivalent (Texas Instruments): LM3553SDX/NOPB maintains identical electrical specifications and differs only in device marking variant, providing direct pin-for-pin compatibility.
Group 2 - Reduced Current Capacity (750mA - 1.33A): AP5724FDCG-7, MIC2289-24YD6-TR, and MP3202DG-LF-Z operate within overlapping supply ranges but deliver lower peak current. These are suitable for applications where 1.2A flash current is not required.
Group 3 - Lower Current Capacity (200mA - 500mA): LT3591EDDB#TRMPBF, LTC3490EDD#PBF, MCP1662T-E/OT, and MCP1664T-E/MNY provide reduced current delivery and are applicable only to lower-power LED driver implementations.
Group 4 - Extended Supply Range: MP3305DD-LF-Z and MP3205DJ-LF-Z support broader input voltage ranges and alternative dimming methods, offering flexibility for different circuit topologies.
Parameter Comparison
| Part Number | Manufacturer | Topology | Supply Min | Supply Max | Current Output | Frequency | Dimming | Temp Range | Package | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|
| LM3553SD/NOPB | Texas Instruments | Step-Up (Boost) | 2.7V | 5.5V | 1.2A (Flash) | 1.2MHz | I2C | -30°C ~ 85°C | 12-WFDFN | ROHS3 |
| LM3553SDX/NOPB | Texas Instruments | Step-Up (Boost) | 2.7V | 5.5V | 1.2A (Flash) | 1.2MHz | I2C | -30°C ~ 85°C | 12-WFDFN | ROHS3 |
| AP5724FDCG-7 | Diodes Incorporated | Step-Up (Boost) | 2.7V | 5.5V | 750mA (Switch) | 1.2MHz | PWM | -40°C ~ 85°C | 6-UDFN | ROHS3 |
| LT3591EDDB#TRMPBF | Analog Devices Inc. | Step-Up (Boost) | 2.5V | 12V | 500mA (Switch) | 1MHz | PWM | -40°C ~ 85°C | 8-WFDFN | ROHS3 |
| LTC3490EDD#PBF | Analog Devices Inc. | Step-Up (Boost) | 1V | 3.2V | 350mA | 1.3MHz | Analog | -40°C ~ 85°C | 8-WFDFN | ROHS3 |
| MCP1662T-E/OT | Microchip Technology | Step-Up (Boost) | 2.4V | 5.5V | 200mA | 500kHz | PWM | -40°C ~ 125°C | SOT-23-5 | ROHS3 |
| MCP1664T-E/MNY | Microchip Technology | Step-Up (Boost) | 2.4V | 5.5V | 300mA | 500kHz | PWM | -40°C ~ 125°C | 8-WFDFN | ROHS3 |
| MIC2289-24YD6-TR | Microchip Technology | Step-Up (Boost) | 2.5V | 10V | 750mA (Switch) | 1.2MHz | Analog, PWM | -40°C ~ 125°C | SOT-23-6 | ROHS3 |
| MP3202DG-LF-Z | Monolithic Power Systems Inc. | Step-Up (Boost) | 2.5V | 6V | 1.33A (Switch) | 1.3MHz | Analog, PWM | -40°C ~ 85°C | 8-TFDFN | ROHS3 |
| MP3205DJ-LF-Z | Monolithic Power Systems Inc. | Step-Up (Boost) | 2.5V | 6V | 350mA (Switch) | 1.3MHz | Analog, PWM | -40°C ~ 85°C | TSOT-23-5 | ROHS3 |
| MP3305DD-LF-Z | Monolithic Power Systems Inc. | Step-Up (Boost) | 2.5V | 6V | 1.33A (Switch) | 2.2MHz | PWM | -40°C ~ 85°C | 8-TFDFN | ROHS3 |
Engineering Selection Recommendations
Direct Replacement (No Design Changes Required): LM3553SDX/NOPB is the only part offering identical electrical and mechanical specifications to the LM3553SD/NOPB. Both parts are manufactured by Texas Instruments, carry ROHS3 compliance, and maintain the same 12-WFDFN package footprint. This variant is suitable for direct substitution without PCB layout modifications.
Functional Substitutes (Design Verification Required):
Parts with current capacity at or above 1.2A (AP5724FDCG-7, MIC2289-24YD6-TR, MP3202DG-LF-Z, MP3305DD-LF-Z) maintain supply voltage compatibility and boost topology but differ in dimming control method or package form factor. These require verification that PWM or analog dimming control integrates with the target application's control architecture.
Parts with reduced current capacity (LT3591EDDB#TRMPBF, LTC3490EDD#PBF, MCP1662T-E/OT, MCP1664T-E/MNY, MP3205DJ-LF-Z) are applicable only to applications where peak LED current requirements do not exceed the specified output current rating. These parts are not suitable for camera flash applications requiring 1.2A flash current.
Compliance Status: All listed substitute parts maintain ROHS3 compliance and active product status. MSL ratings vary; parts with MSL 1 (unlimited) offer superior moisture tolerance compared to the LM3553SD/NOPB MSL 3 rating.
Frequently Asked Questions (FAQ)
Q: Can LM3553SDX/NOPB replace LM3553SD/NOPB without any circuit modifications?
A: Yes. LM3553SDX/NOPB is a direct parametric equivalent differing only in device marking. Pin configuration, electrical specifications, and package dimensions are identical. No PCB layout or schematic changes are required.
Q: Why do some substitute parts have lower current ratings than the LM3553SD/NOPB?
A: LED driver ICs are designed for specific application power levels. Parts rated at 200mA to 500mA are intended for lower-power backlight applications, while the LM3553SD/NOPB's 1.2A flash rating targets high-intensity camera flash circuits. Current capacity directly determines maximum LED brightness and power delivery capability.
Q: What is the significance of dimming control method differences (I2C vs. PWM vs. Analog)?
A: Dimming control method determines how brightness is adjusted. I2C dimming uses digital serial communication for precise control, PWM uses pulse-width modulation for digital brightness adjustment, and analog dimming uses voltage-level control. The LM3553SD/NOPB uses I2C; substitutes with PWM or analog dimming require different control circuitry and firmware implementation.
Q: Are all substitute parts suitable for camera flash applications?
A: No. Only parts with current ratings of 1.2A or greater (LM3553SDX/NOPB, AP5724FDCG-7, MIC2289-24YD6-TR, MP3202DG-LF-Z, MP3305DD-LF-Z) can deliver the flash current required for camera flash circuits. Lower-rated parts are restricted to backlight applications.
Q: What does MSL rating mean, and why does it vary among substitutes?
A: MSL (Moisture Sensitivity Level) indicates how long a component can be exposed to ambient moisture before soldering. MSL 1 (unlimited) parts tolerate indefinite moisture exposure, while MSL 3 parts require soldering within 168 hours of moisture exposure. Higher MSL ratings provide greater manufacturing flexibility and reduced risk of moisture-induced defects.
Q: Can I use MP3305DD-LF-Z as a direct replacement for LM3553SD/NOPB?
A: MP3305DD-LF-Z is functionally compatible for boost topology and current delivery but differs in three critical areas: package type (8-TFDFN vs. 12-WFDFN), dimming control (PWM only vs. I2C), and switching frequency (2.2MHz vs. 1.2MHz). PCB layout redesign and control firmware modification are required.
Q: Which substitute offers the best compatibility with the original LM3553SD/NOPB design?
A: LM3553SDX/NOPB provides 100% compatibility. For alternative manufacturers, MIC2289-24YD6-TR offers the closest match with 1.2MHz switching frequency, 750mA+ current capacity, and dual dimming control (Analog and PWM), though package form factor differs.
Q: Are all substitute parts currently in stock?
A: Inventory status is provided in the part specifications. LM3553SDX/NOPB has 1960 units available. MP3205DJ-LF-Z has the highest inventory at 33,004 units. Verify current availability with your component supplier before design commitment.
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