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Texas Instruments LM3556TME/NOPB
- Part No.:
- LM3556TME/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFBGA, DSBGA
- Datasheet:
-
LM3556TME/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 16DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LM3556TME/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 applications in mobile devices. It operates from 2.5 V to 5.5 V input, delivers >85% efficiency in both torch (100 mA) and flash (1.5 A) modes, and features I²C-programmable current (46.9 mA–1.5 A), hardware STROBE/TORCH/ TX control, and NTC-based thermal current scaling.
For engineers reviewing the LM3556TME/NOPB datasheet, LM3556TME/NOPB pinout, LM3556TME/NOPB application, or LM3556TME/NOPB equivalent, key selection criteria include its grounded-cathode LED topology, 16-pin DSBGA package (1.69 mm × 1.64 mm), 4-MHz switching frequency enabling <20 mm² solution size, adaptive regulation maintaining current source headroom (VHR ≤280 mV), and dual-mode fault handling (NTC trip, IVFM, OVP, UVLO, TSD).
Technical Context
The LM3556TME/NOPB integrates a fixed-frequency (3.72–4.28 MHz) current-mode PWM boost converter with a high-side current source, operating in either Pass Mode (VIN ≥ VLED + VHR) or Boost Mode. Its adaptive regulation ensures the current source remains in compliance by dynamically adjusting switch duty cycle while maintaining ≥150 mV headroom across the LED path.
Control is implemented via a 400-kHz I²C interface supporting register-level configuration of flash/torch current, time-out (100–800 ms), NTC trip point (200–900 mV), IVFM thresholds (2.9–3.6 V), and fault response modes. Hardware inputs-STROBE (flash trigger), TORCH (torch enable), and TX (PA sync)-provide deterministic, sub-µs latency control independent of I²C timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current Range | 46.9 mA to 1.5 A, programmable via I²C; enables precise dimming and flash intensity control |
| Input Voltage Range | 2.5 V to 5.5 V; supports single-cell Li-ion and Li-poly battery operation without external LDO |
| Switching Frequency | 3.72–4.28 MHz; allows use of tiny 10-µF ceramic output capacitor and low-profile inductor |
| Current Source Accuracy | ±5% at 1.5 A flash, ±10% at 46.9 mA torch; ensures consistent brightness and color rendering |
| Efficiency | >85% at 100 mA torch and 1–1.5 A flash; minimizes thermal load and extends battery runtime |
| Package | 16-pin DSBGA, 1.69 mm × 1.64 mm, 0.4-mm pitch; optimized for ultra-thin smartphone camera modules |
| Thermal Protection | Junction shutdown at 150°C (typ), recovery at 135°C (typ); prevents permanent damage under sustained overload |
Pinout & Package
LM3556TME/NOPB uses a 0.4-mm pitch, 16-pin DSBGA (YFQ) package measuring 1.69 mm × 1.64 mm, designed for space-constrained mobile camera modules. The package supports solder reflow per JEDEC J-STD-020 and includes thermal vias for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1, B1 (LED) | High-side current source output | Must be connected together to drive single white LED anode; enables grounded-cathode configuration for improved thermal management |
| B2, A2 (OUT) | Boost converter output | Connects to 10-µF ceramic capacitor to GND; supplies regulated voltage to LED current source |
| B3, A3 (SW) | Internal switch node | Drain connection of NMOS and source of PMOS; requires low-inductance layout to minimize EMI and ringing |
| A4, B4 (GND) | Ground reference | Dual ground pins provide low-impedance return path for high-current flash pulses and IC bias currents |
| C1 (TEMP) | NTC thermistor threshold detector | Monitors external NTC voltage; triggers current scale-back when temperature exceeds programmed trip point (200–900 mV) |
| C2 (TORCH) | Hardware torch enable | Active-high logic input with 300-kΩ internal pulldown; enables movie mode or custom PWM waveforms with 1-µs 0→46.9 mA transition |
| C3 (STROBE) | Hardware flash trigger | Active-high, overrides TORCH; initiates flash pulse with deterministic latency, independent of I²C bus state |
| C4 (IN) | Input supply | Accepts 2.5–5.5 V; bypassed with ≥10-µF ceramic capacitor to suppress battery ripple during high-current transients |
| D1 (TX) | RF PA synchronization input | Active-high interrupt that forces flash-to-torch transition (or shutdown) during high-current transmit events; polarity configurable via register |
| D2 (SDA) | I²C data line | Open-drain, 400-kHz compatible; supports bidirectional communication for full register read/write access |
| D3 (SCL) | I²C clock input | Input-only, 400-kHz compatible; synchronizes all I²C transactions including current programming and fault flag reads |
| D4 (ENABLE) | Standby/shutdown control | Active-high; high = standby (4 µA IQ), low = shutdown (0.1 µA ISD); no internal pulldown resistor |
Key Features
| Feature | Design Value |
|---|---|
| Grounded-cathode LED operation | Enables direct PCB mounting of LED cathode to thermal plane, reducing junction temperature rise by up to 15°C vs. high-side cathode |
| Adaptive current source regulation | Maintains ≥150 mV headroom (VHR) across LED path in real time, maximizing efficiency across VIN and VLED variations |
| Programmable input voltage flash monitor (IVFM) | Two adjustable thresholds (2.9–3.6 V) with four operating modes prevent flash current collapse during battery sag |
| Integrated NTC thermal sensing | Configurable trip point (200–900 mV) and current (25–100 µA) enable accurate LED die temperature tracking and safe derating |
| Hardware synchronization (TX pin) | Sub-µs latency interruption of flash pulse during RF PA transmit, eliminating battery current conflicts without I²C overhead |
Applications
| Smartphone Camera Flash | Tablet Video Torch |
|---|---|
Use Scenario: High-intensity still-image capture in low-light conditions using single white LED. IC Role / Device Role / Timing Role: Synchronous boost driver delivering 1.5-A flash current with <100-ms time-out; STROBE-triggered, I²C-configured. Use Value: Delivers consistent luminance across battery voltage range (2.5–5.5 V) while maintaining >85% efficiency and minimizing thermal stress on adjacent sensors. |
Use Scenario: Continuous illumination for video recording in dim environments. IC Role / Device Role / Timing Role: High-side current source regulating 100-mA torch mode; enabled via TORCH pin or I²C command. Use Value: Achieves >85% efficiency at 100 mA, reducing power draw and heat generation versus linear drivers, extending usable recording time. |
| Mobile Barcode Scanner | AR Glasses Illumination |
Use Scenario: Short-duration, high-brightness LED pulse synchronized to image capture for barcode decoding. IC Role / Device Role / Timing Role: Precision flash controller with 1-µs TORCH response and programmable 100–800 ms time-out; triggered by STROBE or I²C. Use Value: Enables rapid, repeatable flash pulses with minimal delay between commands, critical for high-speed scanning throughput. |
Use Scenario: Low-profile, eye-safe near-infrared (NIR) illumination for depth sensing in compact AR optics. IC Role / Device Role / Timing Role: Compact DSBGA driver powering NIR LED with programmable current (46.9–1.5 A) and thermal derating via TEMP pin. Use Value: 1.69 mm × 1.64 mm footprint fits within tight optical module constraints; NTC scaling ensures stable output under varying ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3554TME/NOPB | Same 16-pin DSBGA package and I²C interface, but rated for 2-A flash current and includes integrated charge pump for higher VLED support | Supports dual-LED or higher-Vf LEDs (up to 6.5 V); lacks TX pin for RF sync and has different IVFM register mapping | Select LM3554TME/NOPB when driving two LEDs in series or requiring >1.5 A peak current; verify IVFM and fault flag register compatibility |
| MAX77693EWL+T | Multi-function PMIC with integrated 1.2-A flash driver, buck/boost converters, and fuel gauge; uses 32-pin WLP package (2.13 mm × 2.13 mm) | Requires system-level integration with other power rails; flash control shares I²C address space and may need arbitration | Choose MAX77693EWL+T only when consolidating multiple power functions into one IC; avoid if dedicated flash performance and minimal footprint are priorities |
Compared with LM3554TME/NOPB and MAX77693EWL+T, the LM3556TME/NOPB offers superior thermal performance via grounded-cathode topology and deterministic hardware control (STROBE/TORCH/TX), making it optimal for single-LED, space-constrained, high-reliability camera flash systems where register-level simplicity and minimal board area are critical.
Availability
LM3556TME/NOPB is available at Aetrix Electronics and suitable for smartphone camera modules, tablet video torches, mobile barcode scanners, and AR glasses illumination requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3556TME/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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability IC design.
The LM3556TME/NOPB belongs to TI's LED flash driver product line, engineered specifically for ultra-compact, high-efficiency camera illumination in battery-powered mobile devices, emphasizing thermal robustness, hardware determinism, and minimal solution size.
FAQ
What is the maximum LED current supported by the LM3556TME/NOPB?
The LM3556TME/NOPB supports a maximum LED flash current of 1.5 A with ±5% accuracy, and a minimum programmable torch current of 46.9 mA. This range is fully configurable via its I²C interface, and the device maintains regulation across the full 2.5 V to 5.5 V input range. The LM3556TME/NOPB achieves this using a high-side current source architecture with adaptive headroom control to ensure stability under varying LED forward voltage conditions.
Does the LM3556TME/NOPB require external components for basic operation?
Yes - the LM3556TME/NOPB requires an external 10-µF ceramic capacitor on the OUT pin to GND, a second 10-µF (or larger) ceramic capacitor on the IN pin to GND, and a small-signal inductor (typically 1–2.2 µH) between SW and GND. No external sense resistors or compensation networks are needed, as current regulation, soft-start, and loop compensation are fully integrated. The LM3556TME/NOPB's design minimizes external parts count while maintaining high efficiency and fast transient response.
How does the TX pin function in the LM3556TME/NOPB?
The TX pin on the LM3556TME/NOPB is a hardware synchronization input that forces an immediate transition from flash mode to torch mode (or shutdown) during high-current RF power amplifier events. When pulled high during a flash pulse, it reduces LED current to the programmed torch level within 4 µs, preventing battery current conflicts. Its polarity and enable state are configurable via I²C registers, and it features a 300-kΩ internal pulldown resistor for default low-state safety. This behavior is deterministic and independent of I²C bus activity.
Can the LM3556TME/NOPB operate without I²C configuration?
Yes - the LM3556TME/NOPB powers up in a functional default state: flash current = 1.5 A, torch current = 100 mA, time-out = 400 ms, and all protection features (NTC, IVFM, OVP, UVLO) enabled. Hardware pins (STROBE, TORCH, ENABLE) allow full flash/torch control without I²C. However, I²C is required to adjust current levels, configure NTC/IVFM thresholds, modify fault responses, or read status flags such as thermal shutdown or LED open-circuit detection. The LM3556TME/NOPB remains fully operational in pin-controlled mode even with I²C lines unconnected.
What thermal protection mechanisms does the LM3556TME/NOPB implement?
The LM3556TME/NOPB implements five layered thermal protections: (1) NTC-based LED die temperature monitoring via the TEMP pin, (2) junction thermal shutdown at 150°C (typical), (3) overvoltage protection limiting VOUT to ~5 V to prevent excessive power dissipation, (4) input undervoltage lockout (UVLO) at 2.8 V to avoid inefficient low-VIN operation, and (5) adaptive current source regulation that maintains minimum headroom (VHR) to reduce power loss. All faults set corresponding bits in the Flags Register (0x0B), and most clear only after an I²C read - ensuring visibility and controlled recovery. These mechanisms collectively safeguard the LM3556TME/NOPB and connected LED under sustained overload or ambient extremes.
LM3556TME/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
LM3556TME/NOPB FAQ
1.How can I place an order for LM3556TME/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3556TME/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 LM3556TME/NOPB reliable?
The price and inventory of LM3556TME/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3556TME/NOPB is usually 5 days.
3.What payment methods are accepted for LM3556TME/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3556TME/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3556TME/NOPB?
LM3556TME/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3556TME/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 LM3556TME/NOPB?
For technical support, including LM3556TME/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3556TME/NOPB requirements.
6.How does Aetrix verify that LM3556TME/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3556TME/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 LM3556TME/NOPB meets industry standards.
7.What is the process for return or replacement of LM3556TME/NOPB?
All LM3556TME/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3556TME/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 LM3556TME/NOPB part is unused and in its original packaging.
Return procedure for LM3556TME/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3556TME/NOPB Tags
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