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Texas Instruments LM3555TLX/NOPB
- Part No.:
- LM3555TLX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFBGA
- Datasheet:
-
LM3555TLX/NOPB.pdf
- Description:
- IC LED DRVR RGLTR I2C 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:5,993
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Product details
Overview
LM3555TLX/NOPB from Texas Instruments is a synchronous boost converter LED flash driver with integrated 500-mA high-side current source, designed for camera phone LED flash applications. It operates across 2.5 V–5.5 V input, delivers up to 500 mA into one LED or 400 mA into two series LEDs, and features dual-mode control (I²C or logic-enable), 2 MHz fixed-frequency PWM, and adaptive LED configuration detection.
For engineers reviewing the LM3555TLX/NOPB datasheet, LM3555TLX/NOPB pinout, LM3555TLX/NOPB application, or LM3555TLX/NOPB equivalent, key selection criteria include its grounded-cathode LED topology, programmable torch/flash current (60–500 mA), built-in overvoltage/short-circuit/broken-inductor protection, and DSBGA-12 package compatibility with space-constrained mobile designs.
Technical Context
The LM3555TLX/NOPB integrates a 2-MHz current-mode synchronous boost converter with automatic mode switching between pass-through (when VIN ≥ VLED + 300 mV) and boost operation. Its high-side current source regulates LED current independently of cathode grounding, eliminating return trace routing complexity.
Dual interface support includes simple logic mode (TORCH/STROBE/EN1/EN2 pins) and I²C mode (400-kHz compatible, register-addressable), with dedicated STROBE synchronization, torch deglitching (6.3–11.7 ms), and hardware flash timeout (850 ms). Eight fault protections-OVP (9.22–9.96 V), UVLO (2.35–2.43 V), thermal shutdown, LED open/short, broken inductor, and VOUT/VLED short-are implemented on-die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports single-cell Li-ion and Li-poly battery systems without external regulation. |
| Max Flash Current | 500 mA (single LED) or 400 mA (two series LEDs) - programmable in 20-mA steps with adaptive default scaling. |
| Torch Current Range | 60 mA to 160 mA - continuous assist-light operation with 20-mA granularity and temperature-stable accuracy. |
| Switching Frequency | 2 MHz ±7.5% - enables use of small 2.2 µH inductors and compact 10 µF ceramic output capacitors. |
| Current Source Headroom | 300–350 mV - ensures regulation margin for high-side current sink across full operating range and temperature. |
| OVP Trip Point | 9.22 V to 9.96 V - protects downstream components during boost overvoltage events; 0.4 V hysteresis prevents chatter. |
| Quiescent Current | 3.5 mA (active), 1.1–4.3 µA (standby), 0.75 µA (shutdown) - minimizes battery drain in always-on mobile devices. |
Pinout & Package
LM3555TLX/NOPB uses a 12-pin DSBGA (YZR) package measuring 2.09 mm × 1.565 mm with 0.4-mm pitch. The package is bottom-terminal, requiring PCB layout per TI's AN-1112 soldering guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (A1) | Power ground | High-current return path for boost switch and LED current; must be low-impedance plane connection. |
| SGND (A2) | Signal ground | Reference for analog blocks (reference, comparators); isolated from PGND to reduce noise coupling. |
| VIN (A3) | Input supply | Connects to battery rail; requires local 10 µF bypass capacitor placed adjacent to pin. |
| SW (B1) | Boost switch node | Drives external 2.2 µH inductor; high dv/dt node requiring tight loop area and guard ring. |
| TORCH (B2) | Torch enable input | Logic-high assertion directly activates constant-current torch mode; includes 6.3–11.7 ms deglitching. |
| IND (B3) | Indicator LED anode drive | Programmable current source (2.5–10 mA) for status LED; supports red LED with 2 V forward voltage. |
| VOUT (C1) | Boost output | Regulated high-voltage rail (up to 8.5 V); connects to output capacitor and feeds VLED current source. |
| STROBE (C2) | Flash trigger I/O | In I²C mode: edge/level-sensitive flash sync input; in logic mode: open-drain LED-count indicator output. |
| I2C/EN (C3) | Interface mode select | High = I²C mode (SDA/SCL active); Low = logic mode (EN1/EN2 active); not intended for runtime toggling. |
| VLED (D1) | Flash LED anode | High-side current source output; drives 1 or 2 series white LEDs with grounded cathodes. |
| SDA/EN2 (D2) | Data/enable pin | I²C data line or logic-mode EN2; internal pulldown active only in logic mode. |
| SCL/EN1 (D3) | Clock/enable pin | I²C clock line or logic-mode EN1; internal pulldown active only in logic mode. |
Key Features
| Feature | Design Value |
|---|---|
| Grounded-cathode LED topology | Eliminates dedicated LED return trace, simplifying PCB layout and reducing EMI in camera modules. |
| Adaptive LED configuration detection | Automatically scales max flash current (500 mA → 400 mA) and defaults based on 1- or 2-LED setup via STROBE pin feedback. |
| Dual independent control interfaces | Hardware-enables torch/flash/indicator via TORCH/STROBE/EN1/EN2 or full register access via 400-kHz I²C bus. |
| Built-in fault protection suite | Eight on-die protections-including OVP, UVLO, thermal shutdown, VOUT/VLED short, LED open/short, and broken inductor-reduce system-level safety design burden. |
| Programmable current limits | Four selectable peak inductor current limits (1.18–2.27 A) allow optimization of inductor size, efficiency, and transient response. |
Applications
| Smartphone Camera Flash | Tablet Imaging Module |
|---|---|
Use Scenario: Compact front/rear camera module requiring high-intensity, synchronized flash pulses with minimal board area. IC Role / Device Role / Timing Role: High-side LED driver providing 500-mA flash current with 2-MHz boost regulation and STROBE-synchronized pulse timing. Use Value: Enables bright, consistent illumination at 1/100 s exposure while maintaining <2.1 mm × 1.6 mm footprint and supporting dual-LED configurations. | Use Scenario: Dual-camera tablet with assist light for video recording and flash for still capture, sharing common power and control resources. IC Role / Device Role / Timing Role: Single IC delivering both torch (60–160 mA) and flash (400 mA) modes with seamless transition and shared VOUT rail. Use Value: Reduces BOM count by consolidating indicator, assist, and flash functions; eliminates need for separate DC-DC and current-source stages. |
| Wearable Health Monitor | Industrial Barcode Scanner |
Use Scenario: Portable pulse oximeter using green/red LEDs for photoplethysmography (PPG), requiring precise, low-noise current control. IC Role / Device Role / Timing Role: Accurate 2.5–10 mA indicator current source (IND pin) with ±20% tolerance and stable headroom for sensor LED biasing. Use Value: Provides calibrated, temperature-compensated LED drive without external DAC or op-amp, improving signal-to-noise ratio in analog front-end. | Use Scenario: Rugged handheld scanner needing reliable flash illumination under variable battery voltage (3.0–4.2 V) and wide ambient temperature (−30°C to +85°C). IC Role / Device Role / Timing Role: Robust flash driver with UVLO (2.35–2.43 V), thermal shutdown (150°C), and 85°C ambient-rated operation. Use Value: Ensures consistent 400-mA flash output across battery discharge cycle and industrial environments without derating or external supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3554TLX/NOPB | Same DSBGA-12 package and pinout; adds I²C register readback capability and improved thermal performance (RθJA = 85°C/W vs. 92.9°C/W). | Preferred where firmware validation of flash status or tighter thermal margin is required in high-density layouts. | Select LM3554TLX/NOPB when real-time register monitoring or >5% higher efficiency at 85°C ambient is critical. |
| RT8542GQW | QFN-16 package; supports 600-mA flash current but lacks dedicated STROBE sync, torch deglitching, and broken-inductor detection. | Suitable for cost-sensitive designs where basic flash control suffices and PCB area allows larger QFN footprint. | Choose RT8542GQW only if STROBE synchronization, multi-fault protection, and ultra-compact DSBGA are non-essential. |
Compared with LM3555TLX/NOPB, LM3554TLX/NOPB offers enhanced diagnostics and thermal margin in identical form factor, while RT8542GQW trades protection depth and package size for higher peak current-making LM3555TLX/NOPB optimal for space-constrained, safety-aware mobile imaging.
Availability
LM3555TLX/NOPB is available at Aetrix Electronics and suitable for smartphone camera modules, tablet imaging subsystems, wearable health sensors, and industrial barcode scanners requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3555TLX/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in mobile power and lighting solutions.
The LM3555TLX/NOPB belongs to TI's camera flash driver product line, engineered specifically for high-efficiency, space-constrained LED illumination in battery-powered imaging devices with stringent EMI and thermal constraints.
FAQ
What is the maximum LED current supported by the LM3555TLX/NOPB in flash mode?
The LM3555TLX/NOPB supports up to 500 mA into a single white LED or 400 mA into two series white LEDs in flash mode. This is achieved through its high-side current source and adaptive configuration detection. Current is programmable in 20-mA steps, with factory defaults set to 500 mA (1 LED) or 320 mA (2 LEDs). The LM3555TLX/NOPB maintains accuracy within ±15.5% over temperature and input voltage range.
How does the LM3555TLX/NOPB handle different LED configurations (1 vs. 2 LEDs)?
The LM3555TLX/NOPB automatically detects LED count using the STROBE pin in simple logic mode: a logic-low output indicates one LED; logic-high indicates two series LEDs. Based on this, it adapts flash current range (500 mA max vs. 400 mA max), default values, and current limit settings. In I²C mode, configuration is set via register bits, enabling deterministic control independent of hardware feedback. The LM3555TLX/NOPB ensures correct headroom and regulation in both cases.
Can the LM3555TLX/NOPB operate in both I²C and logic-control modes simultaneously?
No-the LM3555TLX/NOPB operates exclusively in one interface mode at a time, selected by the logic level on the I2C/EN pin: low for simple logic mode (using TORCH, STROBE, EN1, EN2), high for I²C mode (using SDA/EN2 and SCL/EN1 as data/clock lines). Toggling I2C/EN during operation is not recommended, as it may cause undefined behavior. Mode selection is static at power-up; the LM3555TLX/NOPB does not support dynamic reconfiguration.
What protection features are integrated into the LM3555TLX/NOPB?
The LM3555TLX/NOPB integrates eight on-die protections: overvoltage protection (9.22–9.96 V trip), undervoltage lockout (2.35–2.43 V), thermal shutdown (150°C engage, 135°C disengage), VOUT short-to-GND, VLED short-to-GND, LED open-circuit, broken inductor detection, and output overcurrent. These are fully autonomous-no external components or firmware intervention required. Each fault triggers immediate shutdown and automatic recovery upon condition clearance, ensuring robustness in unattended mobile applications using LM3555TLX/NOPB.
Is the LM3555TLX/NOPB compatible with standard 0.4-mm pitch DSBGA assembly processes?
Yes-the LM3555TLX/NOPB uses a 12-pin YZR-package DSBGA with 0.4-mm ball pitch and 2.09 mm × 1.565 mm body size. TI specifies full compatibility with industry-standard wafer-level chip-scale package (WL-CSP) assembly, including reflow profile, stencil design, and inspection per AN-1112. The device supports Type II solder mask defined (SMD) pads and requires no underfill for typical mobile applications. LM3555TLX/NOPB has been validated across multiple contract manufacturers using IPC-A-610 Class 2 and Class 3 processes.
LM3555TLX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 9.96V
- Current - Output / Channel:
- 500mA (Flash)
- Frequency:
- 2MHz
- Dimming:
- I2C
- Applications:
- Camera Flash
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA
LM3555TLX/NOPB FAQ
1.How can I place an order for LM3555TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3555TLX/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM3555TLX/NOPB reliable?
The price and inventory of LM3555TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3555TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3555TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3555TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3555TLX/NOPB?
LM3555TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3555TLX/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM3555TLX/NOPB?
For technical support, including LM3555TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3555TLX/NOPB requirements.
6.How does Aetrix verify that LM3555TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3555TLX/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM3555TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3555TLX/NOPB?
All LM3555TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3555TLX/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM3555TLX/NOPB part is unused and in its original packaging.
Return procedure for LM3555TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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