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Texas Instruments LM3555TLE/NOPB
- Part No.:
- LM3555TLE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFBGA
- Datasheet:
-
LM3555TLE/NOPB.pdf
- Description:
- IC LED DRVR RGLTR I2C 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:910
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Product details
Overview
LM3555TLE/NOPB from Texas Instruments is a synchronous boost converter LED flash driver with integrated 500-mA high-side current source, 2-MHz fixed-frequency PWM control, and dual-mode (I²C or logic) interface. It drives one white LED at up to 500 mA or two series LEDs at up to 400 mA, supports grounded-cathode LED configuration, and delivers >90% peak efficiency in mobile camera flash applications.
For engineers reviewing the LM3555TLE/NOPB datasheet, LM3555TLE/NOPB pinout, LM3555TLE/NOPB application, or LM3555TLE/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed protection features (OVP, broken inductor detection, LED short/short-to-GND), and real-world design meaning for torch/strobe timing, adaptive current scaling, and dual-interface mode selection.
Technical Context
The LM3555TLE/NOPB implements a current-mode, 2-MHz synchronous boost topology with automatic pass/boost mode transition based on VIN vs. VLED + 300 mV headroom. Its high-side current source regulates LED current independently of cathode grounding, eliminating return trace routing complexity in compact PCB layouts.
Dual control architecture supports either I²C (400-kHz compatible, register-addressable) or simple logic mode (EN1/EN2/TORCH/STROBE direct drive), with STROBE functioning as input (I²C mode) or LED-count indicator output (logic mode). Eight hardware protections-including overvoltage (9.5 V trip), UVLO (2.4 V), thermal shutdown (150°C), and broken inductor detection-are implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Drive Current | 60–500 mA programmable flash current; 60–160 mA torch current; auto-scales max flash level for 1-LED (500 mA default) or 2-LED (320 mA default) configurations |
| Boost Switching Frequency | 2 MHz ±7.5%; enables use of small 2.2 µH inductor and 10 µF input/output capacitors for space-constrained mobile designs |
| Input Voltage Range | 2.5 V to 5.5 V; supports single-cell Li-ion (3.0–4.2 V) and USB-powered operation without external LDO |
| Peak Efficiency | >90% at 400 mA into two series LEDs; minimizes thermal stress and extends battery runtime in flash-intensive use cases |
| I²C Interface Speed | 400 kHz compliant; allows full register access (flash/torch brightness, timeout, strobe mode, fault status) with minimal MCU GPIO overhead |
| Protection Features | Output overvoltage (9.5 V), LED short-to-GND, VOUT short-to-GND, broken inductor detection, UVLO (2.4 V), thermal shutdown (150°C), and current limit (1.25–2.0 A selectable) |
| Quiescent Current | 1.1–4.3 µA standby; 3.5 mA operating; critical for low-power always-on camera subsystems |
Pinout & Package
LM3555TLE/NOPB uses a 12-pin DSBGA (YZR) package measuring 2.09 mm × 1.565 mm with 0.4-mm pitch, optimized for ultra-thin mobile phone camera modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 PGND | Power ground | High-current return path for boost switch; must be connected to solid ground plane under IC for thermal and EMI performance |
| A2 SGND | Signal ground | Low-noise reference for analog blocks (current sense, reference, registers); isolated from PGND to prevent noise coupling |
| A3 VIN | Input voltage supply | Accepts 2.5–5.5 V; requires 10 µF ceramic capacitor placed adjacent to pin for stable boost operation |
| B1 SW | Switch node | Connects to 2.2 µH inductor; carries high di/dt switching current; layout critical for efficiency and EMI |
| B2 TORCH | Torch enable input | Direct logic-level activation of constant-current torch mode; deglitched (6.3–11.7 ms) to reject noise |
| B3 IND | Indicator LED current source | Drives red indicator LED (2.5–10 mA programmable); independent of flash/torch paths |
| C1 VOUT | Boost output | Regulated output (up to 8.5 V); connects to 10 µF bypass cap; feeds VLED current source |
| C2 STROBE | Flash trigger I/O | In I²C mode: edge- or level-sensitive flash start signal; in logic mode: open-drain output indicating LED count (0 = 1 LED, 1 = 2 LEDs) |
| C3 I2C/EN | Interface mode select | High = I²C mode (SDA/SCL active); Low = logic mode (EN1/EN2 active); not designed for dynamic toggling |
| D1 VLED | LED anode current source | High-side 500-mA current sink; connects directly to LED anode; cathode grounded-no return trace needed |
| D2 SDA/EN2 | Data I/O or enable input | I²C data line (mode=high) or EN2 logic input (mode=low); internal pulldown active only in logic mode |
| D3 SCL/EN1 | Clock input or enable input | I²C clock line (mode=high) or EN1 logic input (mode=low); internal pulldown active only in logic mode |
Key Features
| Feature | Design Value |
|---|---|
| Grounded-cathode LED topology | Eliminates dedicated LED return trace; simplifies flex PCB routing and reduces EMI in camera module assemblies |
| Adaptive flash current scaling | Automatically configures max current (500 mA for 1 LED, 320 mA for 2 LEDs) and sets appropriate current limit register values |
| Dual-mode interface | Hardware-selectable I²C (full register control) or logic (3-pin minimal GPIO) - no firmware change required when switching modes |
| Built-in broken inductor detection | Monitors SW node voltage during off-time; triggers fault flag if inductor opens - prevents unregulated VOUT rise and LED damage |
| Programmable torch brightness | 16-level torch current (60–160 mA) set via I²C or fixed in logic mode (60 mA for 2 LEDs, 80 mA for 1 LED) |
| Strobe synchronization | Hardware-level flash timing alignment with image sensor capture; supports both edge-triggered (single pulse) and level-triggered (variable duration) modes |
Applications
| Smartphone Camera Flash | Tablet Imaging Module |
|---|---|
|
Use Scenario: High-intensity flash illumination for low-light photo capture in sub-10mm-thick smartphone bezels. IC Role / Device Role / Timing Role: Synchronous boost converter + high-side current source delivering 500 mA into single LED with 1-ms ramp-up and hardware-strobed timing sync. Use Value: Enables bright, consistent flash without thermal throttling or PCB area penalty - critical for premium imaging performance in thin form factors. |
Use Scenario: Dual-LED flash system for front/rear cameras in 7–10 inch tablets with shared power rail and thermal constraints. IC Role / Device Role / Timing Role: Drives two series-connected LEDs at 400 mA with adaptive current scaling and independent torch assist mode. Use Value: Reduces BOM count by consolidating flash/torch/indicator functions into one IC while maintaining separate brightness control per mode. |
| Mobile Video Conferencing Light | Industrial Barcode Scanner Illumination |
|
Use Scenario: Continuous, flicker-free torch lighting for video calls under variable ambient light conditions. IC Role / Device Role / Timing Role: Precision 60–160 mA constant-current source with 16-step programmability and <10 ms deglitching on TORCH pin. Use Value: Delivers smooth, stable illumination without MCU polling or software PWM - improves user experience and reduces CPU load. |
Use Scenario: Short-duration, high-current LED pulse for barcode reading in handheld industrial scanners with battery life constraints. IC Role / Device Role / Timing Role: Fast-ramping (≤1 ms) 500 mA flash driver with hardware timeout (850 ms default) and OVP/short-circuit protection. Use Value: Ensures reliable illumination pulse even during voltage sag or LED aging - extends field service life and reduces false-read incidents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3554TLE/NOPB | Same DSBGA-12 package and pinout; adds I²C address selection (A0 pin) and enhanced thermal foldback | Preferred for multi-camera systems requiring multiple flash drivers on same I²C bus; supports tighter thermal management in stacked modules | Select when I²C address flexibility or improved thermal derating above 125°C junction is required |
| RT8542GQW | QFN-16 package; 1.5-MHz switching; no built-in indicator LED driver; lower max flash current (350 mA) | Suitable for cost-sensitive single-LED flash where indicator function is handled externally; requires more board area | Select when footprint size is less critical than unit cost and indicator functionality is unnecessary |
Compared with LM3555TLE/NOPB, LM3554TLE/NOPB offers I²C address configurability for multi-device buses and stronger thermal resilience, while RT8542GQW trades integrated indicator capability and higher flash current for lower cost and simpler register map - making each suitable for distinct tiered design requirements.
Availability
LM3555TLE/NOPB is available at Aetrix Electronics and suitable for smartphone camera flash, tablet imaging modules, mobile video conferencing lighting, and industrial barcode scanner illumination requiring stable component supply and long-term production continuity.
Supply support for LM3555TLE/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 automotive, industrial, and consumer IC expertise.
The LM3555TLE/NOPB belongs to TI's mobile LED driver product line, engineered specifically for space-constrained, high-efficiency camera flash and assist lighting in smartphones and portable imaging devices.
FAQ
What is the maximum LED current supported by the LM3555TLE/NOPB in flash mode?
The LM3555TLE/NOPB supports up to 500 mA into a single white LED or up to 400 mA into two series-connected LEDs. This is achieved through its adaptive current scaling feature, which automatically configures the current limit register and default flash level based on detected LED configuration. The device maintains accuracy within ±15.5% across temperature and input voltage ranges.
How does the LM3555TLE/NOPB handle different input voltages during flash operation?
The LM3555TLE/NOPB operates across 2.5 V to 5.5 V input range using a 2-MHz synchronous boost converter. When VIN exceeds VLED + 300 mV, it enters pass mode (PFET fully on); otherwise, it engages boost mode. This dual-mode operation ensures stable LED current regulation regardless of battery voltage sag during flash pulses, and is confirmed in Section 7.3.1 of the SNVS594G datasheet.
Can the LM3555TLE/NOPB drive LEDs with grounded cathodes?
Yes - the LM3555TLE/NOPB integrates a high-side current source that sinks current from the LED anode (VLED pin), allowing the LED cathode to connect directly to system ground. This eliminates the need for a dedicated return trace back to the IC, simplifying flex PCB routing and reducing EMI in camera module designs, as explicitly stated in the device description and Figure 1 functional diagram.
What protection features are built into the LM3555TLE/NOPB?
The LM3555TLE/NOPB includes eight hardware-based protections: output overvoltage (9.5 V trip), LED short-to-GND, VOUT short-to-GND, broken inductor detection, undervoltage lockout (2.4 V), thermal shutdown (150°C), current limit (four selectable levels: 1.25–2.0 A), and I²C hang-up timeout (35 ms). All are implemented internally with no external components required.
Is the LM3555TLE/NOPB pin-compatible with other TI flash drivers like the LM3554TLE/NOPB?
Yes - the LM3555TLE/NOPB and LM3554TLE/NOPB share identical DSBGA-12 (YZR) packaging, pinout, and mechanical footprint. The LM3554 adds an A0 pin for I²C address selection and enhanced thermal foldback, but all 12 signal pins match function-for-function, enabling drop-in replacement where those advanced features are not required.
LM3555TLE/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
LM3555TLE/NOPB FAQ
1.How can I place an order for LM3555TLE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3555TLE/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 LM3555TLE/NOPB reliable?
The price and inventory of LM3555TLE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3555TLE/NOPB is usually 5 days.
3.What payment methods are accepted for LM3555TLE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3555TLE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3555TLE/NOPB?
LM3555TLE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3555TLE/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 LM3555TLE/NOPB?
For technical support, including LM3555TLE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3555TLE/NOPB requirements.
6.How does Aetrix verify that LM3555TLE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3555TLE/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 LM3555TLE/NOPB meets industry standards.
7.What is the process for return or replacement of LM3555TLE/NOPB?
All LM3555TLE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3555TLE/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 LM3555TLE/NOPB part is unused and in its original packaging.
Return procedure for LM3555TLE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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