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Texas Instruments LM3554TMX/NOPB
- Part No.:
- LM3554TMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFBGA, DSBGA
- Datasheet:
-
LM3554TMX/NOPB.pdf
- Description:
- IC LED DRVR RGLTR I2C 16DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,980
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Product details
Overview
LM3554TMX/NOPB from Texas Instruments is a synchronous boost converter IC with dual high-side 600-mA LED current sources, I²C-compatible interface, and programmable 4.5-V or 5-V output voltage mode - delivering up to 1.2-A total flash current, >90% efficiency, and ultra-small <23 mm² solution size for smartphone camera flash systems.
For engineers reviewing the LM3554TMX/NOPB datasheet, LM3554TMX/NOPB pinout, LM3554TMX/NOPB application, or LM3554TMX/NOPB equivalent, key selection criteria include hardware-triggered strobe/flash control, NTC-based thermal current scaling, open/short LED fault detection, and dual TX synchronization inputs for RF power amplifier coordination.
Technical Context
The LM3554TMX/NOPB integrates a fixed 2-MHz current-mode synchronous boost converter with two independent high-side current sources, supporting both LED current regulation (flash/torch/indicator modes) and regulated voltage-output mode (4.5 V or 5 V). It operates across 2.5 V–5.5 V input, maintains ≥300 mV headroom (VHR) across current sources in boost mode, and transitions to pass-through mode when VIN exceeds VLED + VHR.
Its functional architecture includes four configurable logic pins (TX1/TORCH/GPIO1, ENVM/TX2/GPIO2, STROBE, HWEN), an LEDI/NTC pin supporting either indicator LED drive or thermistor threshold detection (VTRIP = 0.947–1.157 V), and five real-time status flags (flash timeout, overtemperature, LED open/short, thermal fault, VIN monitor fault) readable via I²C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports direct connection to single-cell Li-ion or Li-poly battery rails without pre-regulation. |
| Max Total LED Current | 1.2 A (600 mA per channel) - enables high-brightness flash for smartphone rear cameras with dual-LED arrays. |
| Output Voltage Options | Programmable 4.5 V or 5 V - selectable via I²C register for compatibility with diverse LED forward voltage stacks or auxiliary voltage rail needs. |
| I²C Interface Speed | 400 kHz - ensures fast configuration of brightness, timeout, current limit, and mode switching without CPU overhead. |
| Switching Frequency | 1.75–2.23 MHz - enables use of compact 2.2 µH inductors and minimizes EMI in space-constrained mobile PCBs. |
| Thermal Protection | Junction shutdown at 150°C (typ), recovery at 135°C (typ) - prevents permanent damage during sustained high-current flash operation. |
| LED Fault Detection | Integrated open-circuit and short-to-GND detection - eliminates need for external sense resistors or comparators in flash safety monitoring. |
Pinout & Package
LM3554TMX/NOPB uses a 16-pin DSBGA (YFQ) package with 1.685 mm × 1.685 mm body size and 0.5-mm pitch - optimized for ultra-thin mobile phone camera modules with minimal board area and low thermal resistance (RθJA = 75.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (LED1) | High-side LED current source output | Drives first flash LED anode; grounded cathode improves thermal dissipation and simplifies PCB routing. |
| A2/B2 (OUT) | Boost converter output | Supplies regulated voltage to LED strings or auxiliary 4.5/5-V rails; monitored for OVP (5.4–5.7 V trip). |
| A3/B3 (SW) | Internal switch node | Connects to external 2.2 µH inductor; carries peak currents up to 2.83 A (CL=11 setting) during boost cycles. |
| A4/B4 (GND) | Power ground | Primary return path for boost inductor, LED currents, and internal regulators; requires low-impedance PCB plane. |
| B1 (LED2) | High-side LED current source output | Drives second flash LED anode; matches LED1 current within 0.35% (600-mA setting) for balanced illumination. |
| C1 (LEDI/NTC) | Configurable indicator/thermal pin | Either sinks 2.3–8.2 mA for status LEDs or compares thermistor voltage against 0.947–1.157 V threshold for thermal foldback. |
| C2 (TX1/TORCH/GPIO1) | Multi-function input/output | Hardware torch enable (active-high), RF sync input (TX1), or GPIO - allows system-level coordination with PA burst events. |
| C3 (STROBE) | Active-high flash trigger | Direct hardware initiation of flash pulse; overrides I²C commands and supports sub-20 µs flash-to-torch settling. |
| C4 (IN) | Main power input | Accepts 2.5–5.5 V; requires ≥4.7 µF ceramic bypass capacitor to sustain peak 1.2-A LED current draw. |
| D1 (ENVM/TX2/GPIO2/INT) | Multi-function input/output | Enables voltage-output mode (ENVM), provides dual-polarity RF sync (TX2), or signals flash timeout/LED fault (INT). |
| D2 (SDA) | I²C data line | Open-drain bidirectional interface; supports standard/fast-mode I²C up to 400 kHz with 3 mA sink capability. |
| D3 (SCL) | I²C clock line | Input-only clock; defines timing for register reads/writes including flash duration (32–1024 ms), current limits, and mode control. |
| D4 (HWEN) | Active-low hardware enable | Forces full shutdown during system faults; overrides all software and hardware controls to prevent uncontrolled flash activation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual high-side current sources | Independent 600-mA channels with 0.35% matching - enables uniform dual-LED flash illumination without external ballast resistors. |
| Hardware flash/torch enable | STROBE and TX1/TORCH pins provide <20 µs response - critical for synchronizing flash pulses with image sensor exposure timing. |
| LED thermal protection | LEDI/NTC pin supports NTC thermistor feedback with programmable foldback - reduces LED current before junction overheating occurs. |
| Four operating modes | Torch (up to 17 mA/channel), Flash (up to 600 mA/channel), Indicator (2.3–8.2 mA), and Voltage Output (4.5/5 V) - consolidates multiple functions into one IC. |
| Open/short LED detection | Automatic fault identification without external circuitry - reports status via I²C flag bits to enable fail-safe camera UI behavior. |
| Programmable current limit | Four settings (1.05/1.51/1.99/2.45 A) via Flash Duration Register - prevents inductor saturation and battery overload during transient conditions. |
Applications
| Smartphone Camera Flash | Mobile Device LED Indicator |
|---|---|
Use Scenario: Dual-LED rear camera module requiring high-intensity flash for low-light photography with precise timing alignment to sensor exposure. IC Role / Device Role / Timing Role: Primary flash controller managing 1.2-A total current, hardware-triggered strobe, and RF sync via TX1/TX2 to avoid interference with cellular transmission bursts. Use Value: Eliminates need for discrete boost converter + dual current sinks; achieves >90% efficiency and <23 mm² footprint while supporting thermal foldback for LED reliability. |
Use Scenario: Status lighting on smartphones, tablets, or wearables needing programmable brightness levels and low quiescent current. IC Role / Device Role / Timing Role: Configurable indicator driver using LEDI/NTC pin in LEDI mode, controlled via I²C to set 4 brightness levels (2.3–8.2 mA) with minimal MCU intervention. Use Value: Reduces BOM count by integrating indicator drive into flash controller; draws only 630 µA quiescent current when inactive. |
| RF-Coordinated Torch Mode | Backup Voltage Rail Generator |
Use Scenario: Front-facing camera or video call torch requiring stable low-power illumination synchronized with RF power amplifier activity. IC Role / Device Role / Timing Role: Torch mode controller using TX1/TORCH and ENVM/TX2 inputs to force immediate transition from flash to 180-mA torch current upon PA activation signal. Use Value: Prevents flash-induced RF desense by enabling hardware-gated torch dimming - settles in 20 µs with no software latency. |
Use Scenario: Auxiliary 5-V supply for USB OTG, audio codecs, or sensors in battery-powered portable devices. IC Role / Device Role / Timing Role: Regulated voltage-output mode booster delivering up to 5 W at 5 V, enabled via ENVM pin or I²C command. Use Value: Replaces dedicated buck-boost ICs; supports light-load PFM mode for improved efficiency at sub-100-mA loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX/NOPB | Single-channel 1-A LED driver; no voltage-output mode; lacks TX sync inputs and NTC support. | Suitable only for basic torch/flash in cost-sensitive single-LED designs; cannot replace dual-LED or RF-coordinated use cases. | Select only if dual-channel operation, thermal sensing, or 4.5/5-V rail generation are unnecessary. |
| RT8542GSP | 2.5-A single-channel flash driver; supports I²C and strobe; no NTC interface or voltage-output mode. | Higher current capacity for single high-power LED; lacks dual-channel balance and thermal foldback - requires external thermistor circuitry. | Prefer when >1.2-A single-LED flash is required and thermal management is handled externally. |
Compared with LM3554TMX/NOPB, LM3530TMX/NOPB omits dual-channel control and RF sync, limiting its use to simpler implementations; RT8542GSP offers higher single-channel current but adds design complexity for thermal safety and removes voltage-rail functionality - making LM3554TMX/NOPB the only integrated solution for dual-LED, thermally aware, RF-synchronized flash with auxiliary power capability.
Availability
LM3554TMX/NOPB is available at Aetrix Electronics and suitable for smartphone camera modules, mobile device status lighting, and portable electronics requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.
Supply support for LM3554TMX/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 LM3554TMX/NOPB belongs to TI's high-efficiency LED flash driver product line, designed specifically for space-constrained, thermally sensitive smartphone and tablet camera systems requiring hardware-synchronized, fault-protected illumination control.
FAQ
What are the supported input voltage ranges for LM3554TMX/NOPB?
The LM3554TMX/NOPB operates across a 2.5 V to 5.5 V input range, enabling direct connection to single-cell lithium-ion or lithium-polymer batteries. This range accommodates typical smartphone battery voltages under load and ensures stable flash performance even as battery voltage declines during discharge. The LM3554TMX/NOPB also includes a programmable input voltage monitor that can trigger fault reporting when VIN falls below 2.95–3.23 V.
How does LM3554TMX/NOPB handle thermal protection for LEDs?
The LM3554TMX/NOPB implements thermal protection via its LEDI/NTC pin, configurable as a threshold detector for an external NTC thermistor. When the sensed voltage crosses the 0.947–1.157 V trip point, the device scales back LED current to prevent overheating - a feature confirmed in the datasheet's Feature Description section. This hardware-based foldback operates independently of I²C commands and ensures rapid response without MCU involvement.
Can LM3554TMX/NOPB drive two LEDs independently at different currents?
No - the LM3554TMX/NOPB provides matched dual high-side current sources (LED1 and LED2) that operate at identical programmed current levels in flash or torch mode. Its electrical characteristics specify 0.35% current matching between channels at 600 mA, confirming tight tracking but not independent control. For asymmetric current requirements, external current-setting resistors or separate drivers would be needed, as the LM3554TMX/NOPB does not support per-channel current programming.
What is the purpose of the STROBE and TX1/TORCH pins on LM3554TMX/NOPB?
The STROBE pin provides active-high hardware triggering of flash pulses with sub-20 µs settling time, essential for precise synchronization with image sensor exposure. The TX1/TORCH pin is multi-functional: it can serve as a hardware torch enable, an RF power amplifier synchronization input (TX1), or a general-purpose I/O. Both pins allow system-level coordination without I²C latency - a capability explicitly documented in the Pin Descriptions and Feature Description sections of the LM3554TMX/NOPB datasheet.
Does LM3554TMX/NOPB support open-circuit and short-circuit LED fault detection?
Yes - the LM3554TMX/NOPB integrates both open-circuit and short-to-GND LED fault detection. These protections are implemented internally and reported via dedicated I²C status flags (LED open fault, LED short fault). No external components are required, and the functionality is validated in the "Five protection features" description and Electrical Characteristics table, where output short-circuit current limit is specified as 550 mA.
What package type and dimensions does LM3554TMX/NOPB use?
The LM3554TMX/NOPB uses a 16-pin DSBGA (Die Size Ball Grid Array) package designated YFQ, with a maximum body size of 1.685 mm × 1.685 mm and 0.5-mm ball pitch. This wafer-level chip-scale package delivers low thermal resistance (RθJA = 75.8°C/W) and minimal PCB footprint - critical for ultra-thin mobile camera modules. Package details are confirmed in the "Device Information" table and Mechanical, Packaging, and Orderable Information section of the official datasheet.
LM3554TMX/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:
- 2
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 5V
- Current - Output / Channel:
- 600mA (Flash)
- Frequency:
- 2MHz
- Dimming:
- I2C
- Applications:
- Camera Flash
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DSBGA
LM3554TMX/NOPB FAQ
1.How can I place an order for LM3554TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3554TMX/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 LM3554TMX/NOPB reliable?
The price and inventory of LM3554TMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3554TMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3554TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3554TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3554TMX/NOPB?
LM3554TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3554TMX/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 LM3554TMX/NOPB?
For technical support, including LM3554TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3554TMX/NOPB requirements.
6.How does Aetrix verify that LM3554TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3554TMX/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 LM3554TMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3554TMX/NOPB?
All LM3554TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3554TMX/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 LM3554TMX/NOPB part is unused and in its original packaging.
Return procedure for LM3554TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3554TMX/NOPB Tags
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