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Texas Instruments LM3556TMX/NOPB
- Part No.:
- LM3556TMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFBGA, DSBGA
- Datasheet:
-
LM3556TMX/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 16DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,069
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Product details
Overview
LM3556TMX/NOPB from Texas Instruments is a 4-MHz synchronous boost LED flash driver with integrated 1.5-A high-side current source, designed for single-white-LED camera flash in mobile devices. It operates from 2.5 V to 5.5 V input, delivers up to 1.5 A flash current with ±5% accuracy at 4 V output, and supports hardware-triggered strobe/torch modes plus I²C-programmable NTC thermal scaling for smartphone rear-camera illumination.
For engineers reviewing the LM3556TMX/NOPB datasheet, LM3556TMX/NOPB pinout, LM3556TMX/NOPB application, or LM3556TMX/NOPB equivalent, key selection criteria include its grounded-cathode LED topology, 16-pin DSBGA package (1.69 mm × 1.64 mm), 46.9 mA–1.5 A programmable current range, hardware TX synchronization for RF PA events, and input-voltage flash monitoring with adjustable hysteresis and filter timing.
Technical Context
The LM3556TMX/NOPB integrates a fixed-frequency (3.72–4.28 MHz) current-mode PWM boost converter with adaptive headroom regulation (VHR = 150–280 mV) to maintain high-side current source compliance across input voltage and LED forward voltage variations. Its pass mode operation eliminates switching when VIN ≥ VLED + VHR, improving efficiency at higher input voltages.
Control is implemented via a 400-kHz I²C interface supporting register-based configuration of flash/torch current, timeout (100–800 ms), NTC trip point (200–900 mV), IVFM thresholds (2.9–3.6 V), and fault response modes. Hardware pins-STROBE, TORCH, and TX-enable direct system-level timing control without software intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current Range | 46.9 mA to 1.5 A, programmable via I²C with ±5% accuracy at full scale - enables precise brightness control across torch and flash modes. |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single-cell Li-ion/Li-poly battery systems including discharge tail-end operation. |
| Switching Frequency | 3.72–4.28 MHz - allows use of ultra-small 10-µF ceramic output capacitors and low-profile inductors <1 mm height. |
| Efficiency | >85% in torch mode (100 mA) and flash mode (1 A–1.5 A) - minimizes thermal load and extends battery runtime during imaging. |
| Package | 16-pin DSBGA, 0.4-mm pitch, 1.69 mm × 1.64 mm - optimized for space-constrained mobile camera modules. |
| Thermal Protection | Junction shutdown at 150°C (typical), restart at 135°C - ensures safe operation under sustained flash duty cycles. |
| I²C Interface | 400-kHz compatible, with SDA/SCL pins and register-mapped status flags - enables real-time fault reporting (OVP, UVLO, NTC, LED open/short). |
Pinout & Package
LM3556TMX/NOPB uses a 0.4-mm pitch, 16-pin DSBGA (YFQ) package measuring 1.69 mm × 1.64 mm with bottom-side thermal pad. Pin assignment follows TI's standard top-view layout with dual-pad connections for high-current paths (LED, OUT, GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, B1 (LED) | High-side current source output | Drives anode of single white LED; both pads must be connected in parallel for 1.5-A capability and thermal spreading. |
| B2, A2 (OUT) | Boost converter output | Supplies regulated voltage to LED cathode path; requires 10-µF ceramic capacitor to GND for stability. |
| B3, A3 (SW) | Internal switch node | Connects to external inductor; carries high di/dt switching current - critical for EMI-sensitive camera PCB layout. |
| A4, B4 (GND) | Power ground | Dual thermal/low-impedance return path; must be tied directly to PCB ground plane with multiple vias. |
| C1 (TEMP) | NTC thermistor comparator input | Monitors LED temperature via external NTC; triggers current scale-back when voltage drops below programmed threshold (200–900 mV). |
| C2 (TORCH) | Hardware torch enable | Active-high logic input with 300-kΩ pulldown; enables instant 46.9 mA–1.5 A torch mode or custom PWM waveforms. |
| C3 (STROBE) | Hardware flash trigger | Active-high strobe overrides TORCH; initiates flash pulse with 1-µs rise time - suitable for precise timing with image sensor sync. |
| C4 (IN) | Input supply | Accepts 2.5–5.5 V battery input; bypassed with ≥10-µF ceramic capacitor to suppress ripple during flash bursts. |
| D1 (TX) | RF power amplifier sync | Active-high interrupt input with 300-kΩ pulldown; forces flash-to-torch transition within 4 µs to reduce peak battery current during PA transmit. |
| D2 (SDA) | I²C data line | Open-drain bidirectional interface; supports read/write of 11 registers including current settings, fault flags, and IVFM thresholds. |
| D3 (SCL) | I²C clock input | 400-kHz max clock rate; used to configure flash timeout, NTC hysteresis, and enable/disable protection features. |
| D4 (ENABLE) | Standby control | Active-high enable pin; low = shutdown (1.3 µA IQ), high = standby (4 µA IQ) - no internal pulldown resistor required. |
Key Features
| Feature | Design Value |
|---|---|
| Grounded-cathode LED architecture | Enables direct thermal coupling of LED to PCB ground plane - improves thermal management and simplifies mechanical mounting in thin camera modules. |
| Adaptive headroom regulation (VHR) | Maintains 150–280 mV minimum across current source - ensures regulation over full VIN (2.5–5.5 V) and VLED (2.8–4.2 V) range without manual compensation. |
| Programmable input-voltage flash monitor (IVFM) | Two adjustable thresholds (2.9–3.6 V) with four operating modes - prevents flash current collapse during battery sag while avoiding premature cutoff. |
| Hardware TX synchronization | 4-µs flash-to-torch transition on rising edge - coordinates LED dimming with RF PA transmit windows to meet 3GPP peak current limits. |
| Integrated NTC thermal sensing | Configurable trip point (200–900 mV) and bias current (25–100 µA) - supports multiple NTC types and enables dynamic current derating before LED junction overheating. |
| Small solution size (<20 mm²) | Uses only one inductor, one 10-µF ceramic cap, and zero external resistors - reduces BOM count and assembly cost in high-volume smartphone designs. |
Applications
| Smartphone Rear Camera Flash | Tablet Dual-LED Illumination |
|---|---|
|
Use Scenario: High-intensity still-image capture in low-light conditions using main rear camera module. IC Role / Device Role / Timing Role: Primary flash driver delivering 1.5-A pulse synchronized to image sensor exposure timing via STROBE signal. Use Value: Delivers consistent luminance across battery voltage range (3.0–4.2 V) with >85% efficiency, minimizing thermal throttling during burst photography. |
Use Scenario: Dual-LED video lighting for front/rear facing cameras during video call or recording. IC Role / Device Role / Timing Role: Torch-mode current source providing stable 100–500 mA illumination with hardware TORCH enable and I²C brightness adjustment. Use Value: Enables flicker-free continuous lighting with <1% current ripple and soft-start to prevent audible coil whine during video startup. |
| Mobile Barcode Scanner Flash | Automotive Cabin Camera Illumination |
|
Use Scenario: Short-duration, high-current flash for rapid barcode or QR code capture in handheld scanners. IC Role / Device Role / Timing Role: Strobe-triggered flash controller with 100-ms programmable timeout and fast 1-µs TORCH activation for indicator feedback. Use Value: Supports sub-100-ms flash pulses with accurate current regulation - ensures reliable decode under variable ambient light without overexposure. |
Use Scenario: Low-power cabin monitoring camera requiring discreet, non-distracting illumination in automotive infotainment systems. IC Role / Device Role / Timing Role: I²C-configured torch driver with NTC thermal scaling and UVLO protection for 12-V battery-supplied DC-DC rail. Use Value: Maintains safe LED junction temperature under extended operation via automatic current reduction when TEMP pin detects >75°C board temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3554TMX/NOPB | Same 16-pin DSBGA package and I²C interface, but rated for 2-A flash current and includes dedicated flash-ready flag (READY pin). | Supports higher-power dual-LED or RGB flash configurations where >1.5 A total current is required. | Select LM3554TMX/NOPB when designing for future-proof flash intensity headroom or need READY signal for precise sensor synchronization. |
| RT8548GQW | 2.5-A capable boost flash driver in 20-pin QFN (4 mm × 4 mm); lacks NTC input and IVFM, but adds analog torch dimming via CTRL pin. | Suitable for industrial handhelds or medical devices needing analog brightness control and higher current, but not thermal-aware mobile use. | Choose RT8548GQW only if board area permits larger package and thermal management is handled externally - no integrated NTC scaling. |
Compared with LM3556TMX/NOPB, LM3554TMX/NOPB offers higher flash current and a dedicated READY output for tighter timing control, while RT8548GQW trades thermal intelligence for analog dimming flexibility and higher peak current in a larger footprint - neither is pin-compatible, and all require distinct PCB layout and firmware adaptation.
Availability
LM3556TMX/NOPB is available at Aetrix Electronics and suitable for smartphone camera modules, tablet imaging subsystems, and portable barcode scanners requiring stable component supply, long-term lifecycle support, and traceable sourcing for consumer electronics production.
Supply support for LM3556TMX/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 ICs, with decades of expertise in mobile power and lighting solutions.
The LM3556TMX/NOPB belongs to TI's camera flash driver product line, engineered specifically for space-constrained, thermally sensitive mobile imaging applications requiring high-efficiency, hardware-synchronized LED control and intelligent battery-aware current regulation.
FAQ
What is the maximum flash current supported by the LM3556TMX/NOPB?
The LM3556TMX/NOPB supports a maximum flash current of 1.5 A with ±5% accuracy at VOUT = 4 V, as specified in its electrical characteristics table. This current is delivered through the high-side current source connected to pins A1/B1 (LED), and remains stable across input voltages from 2.5 V to 5.5 V due to adaptive headroom regulation. The device maintains this rating under TA = −40°C to +85°C ambient conditions.
Does the LM3556TMX/NOPB support thermal protection for the LED?
Yes, the LM3556TMX/NOPB includes integrated NTC thermistor monitoring via the TEMP pin. It supports programmable trip points from 200 mV to 900 mV and bias currents from 25 µA to 100 µA, enabling precise detection of LED temperature rise. When triggered, it can force current scale-back into torch mode or shutdown - configurable via the NTC Settings Register (0x02) and Configuration Register (0x07).
How does the TX pin function during RF transmission events?
The TX pin on the LM3556TMX/NOPB serves as a hardware synchronization input for RF power amplifier events. When pulled high during a flash pulse, it forces the LED current to transition from flash mode to torch mode within 4 µs, reducing peak battery current. The polarity (active-high/active-low) and enable state are programmable via I²C registers 0x07 and 0x0A, allowing flexible integration with baseband processor timing signals.
What package type and dimensions does the LM3556TMX/NOPB use?
The LM3556TMX/NOPB uses a 16-pin DSBGA (YFQ) package with 0.4-mm pitch, measuring 1.69 mm × 1.64 mm maximum body size. It features a bottom thermal pad and dual-pad assignments for high-current terminals (LED, OUT, GND) to enhance thermal dissipation and current handling - essential for sustained flash operation in thin mobile form factors.
Can the LM3556TMX/NOPB operate without I²C configuration?
Yes, the LM3556TMX/NOPB supports basic operation using only hardware pins: STROBE enables flash, TORCH enables torch mode, and ENABLE controls standby/shutdown. Default I²C register values provide functional defaults (e.g., 1.5-A flash current, 400-ms timeout), but full feature utilization - including NTC scaling, IVFM, fault reporting, and current fine-tuning - requires I²C initialization and monitoring.
LM3556TMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFBGA, DSBGA
- 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:
- -
- Current - Output / Channel:
- 1.5A (Flash)
- Frequency:
- 4MHz
- Dimming:
- I2C
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DSBGA
LM3556TMX/NOPB FAQ
1.How can I place an order for LM3556TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3556TMX/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 LM3556TMX/NOPB reliable?
The price and inventory of LM3556TMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3556TMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3556TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3556TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3556TMX/NOPB?
LM3556TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3556TMX/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 LM3556TMX/NOPB?
For technical support, including LM3556TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3556TMX/NOPB requirements.
6.How does Aetrix verify that LM3556TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3556TMX/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 LM3556TMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3556TMX/NOPB?
All LM3556TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3556TMX/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 LM3556TMX/NOPB part is unused and in its original packaging.
Return procedure for LM3556TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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