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Texas Instruments LM3554TMEEV
- Part No.:
- LM3554TMEEV
- Manufacturer:
- Texas Instruments
- Category:
- LED Driver Evaluation Boards
- Package:
- Datasheet:
-
LM3554TMEEV.pdf
- Description:
- EVAL BOARD FOR LM3554
- Quantity:
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Product details
Overview
LM3554TMEEV from Texas Instruments is a synchronous boost converter with dual high-side 600-mA LED current sources, operating from 2.5 V to 5.5 V input and delivering up to 1.2 A total LED current or regulated 4.5-V/5-V output. It integrates I²C-compatible control, hardware flash/torch enable (STROBE/HWEN), thermal sensing via LEDI/NTC, and open/short LED fault detection - designed for smartphone camera flash systems requiring precise current regulation and RF-synchronized torch-to-flash transitions.
For engineers reviewing the LM3554TMEEV datasheet, LM3554TMEEV pinout, LM3554TMEEV application, or LM3554TMEEV equivalent, key selection criteria include its 2-MHz fixed-frequency current-mode architecture, programmable flash timeout (32–1024 ms), <23 mm² solution size, 90%+ efficiency at 1.2-A load, and dual TX inputs for RF power amplifier pulse synchronization.
Technical Context
The LM3554TMEEV implements a fixed 2-MHz current-mode PWM boost controller with synchronous NMOS/PMOS switching, supporting both LED current-source mode (with 300-mV headroom voltage VHR) and constant-voltage output mode (4.5 V or 5 V). Its pass-mode operation above VLED + 300 mV eliminates switching when input voltage suffices, improving light-load efficiency.
Four logic-configurable pins-TX1/TORCH/GPIO1, ENVM/TX2/GPIO2, STROBE, and HWEN-enable hardware-triggered flash initiation, RF-synchronized torch scaling, voltage-mode enable, and active-low system fault shutdown. The LEDI/NTC pin serves either as a 2.3–8.2 mA indicator LED driver or as a 0.947–1.157 V threshold detector for NTC-based thermal foldback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports single-cell Li-ion (3.0–4.2 V nominal) and USB-powered 5-V rails without external LDO. |
| Max Total LED Current | 1.2 A (600 mA per channel) - enables high-brightness flash for 13-megapixel+ smartphone cameras. |
| Output Voltage Options | Programmable 4.5 V or 5 V - selectable via I²C register for compatibility with diverse LED forward voltage stacks. |
| Switching Frequency | 1.75–2.23 MHz (typ. 2 MHz) - allows use of ultra-small 2.2-µH inductors and minimizes EMI in compact mobile layouts. |
| Current Matching Accuracy | ±0.35% - ensures uniform brightness across dual LEDs without external calibration. |
| I²C Interface Speed | 400 kHz - compatible with standard fast-mode I²C controllers in baseband processors. |
| Thermal Protection | Junction shutdown at 150°C (typ.), recovery at 135°C - prevents damage during sustained flash bursts. |
| Quiescent Current | 630 µA - maintains low standby power during camera preview mode. |
Pinout & Package
LM3554TMEEV is housed in a 16-pin DSBGA (YFQ) package measuring 1.685 mm × 1.685 mm, optimized for space-constrained mobile PCBs with bottom-solder interconnects and minimal thermal resistance (RθJA = 75.8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 LED1 | Power Output | High-side current source for first flash LED - grounded cathode enables direct PCB heat sinking and flexible LED placement. |
| A2/B2 OUT | Power Output | Boost converter regulated output - supplies both LED channels and supports voltage-output mode for auxiliary loads. |
| A3/B3 SW | Power Switch Node | Internal NMOS/PMOS switch drain - connects to external 2.2-µH inductor and requires low-inductance layout to minimize switching loss. |
| A4/B4 GND | Ground | Primary power return - must be connected to solid ground plane for stable current regulation and EMI control. |
| B1 LED2 | Power Output | High-side current source for second flash LED - matched to LED1 for balanced dual-LED illumination. |
| C1 LEDI/NTC | Configurable I/O | Either 2.3–8.2 mA indicator LED driver or 0.947–1.157 V NTC comparator input - enables closed-loop thermal derating during extended flash use. |
| C2 TX1/TORCH/GPIO1 | Configurable I/O | Hardware torch enable, RF sync input (TX1), or GPIO - allows baseband processor to force low-current torch mode during PA transmit events. |
| C3 STROBE | Input | Active-high flash trigger - initiates full-current flash pulse independent of I²C state, critical for low-latency capture. |
| C4 IN | Power Input | Main supply input - requires ≥4.7 µF ceramic bypass capacitor to sustain peak 1.2-A LED current without rail collapse. |
| D1 ENVM/TX2/GPIO2/INT | Configurable I/O | Voltage-mode enable, dual-polarity RF sync (TX2), GPIO, or interrupt output - provides flexible system-level coordination and fault reporting. |
| D2 SDA | I²C Data | Open-drain bidirectional data line - supports standard/fast-mode I²C for brightness, timeout, and mode configuration. |
| D3 SCL | I²C Clock | Input-only clock line - 400-kHz max frequency enables rapid register updates between frames. |
| D4 HWEN | Input | Active-low hardware enable - asserts immediate shutdown during system faults, overriding all software commands. |
Key Features
| Feature | Design Value |
|---|---|
| Dual high-side current sources | 600 mA per channel with ±0.35% matching - eliminates need for external current-sense resistors and improves optical uniformity. |
| Hardware flash/torch control | STROBE and TX1/TORCH pins enable sub-µs latency mode switching - essential for real-time RF-PA coordination in LTE/5G handsets. |
| Programmable flash timeout | 32 discrete steps from 32 ms to 1024 ms - allows precise energy control to avoid LED overheating and battery sag. |
| Open/short LED detection | Integrated comparators flag fault conditions on LED1/LED2 - prevents unregulated current flow and enables automatic error recovery. |
| Thermal foldback via NTC | LEDI/NTC pin detects thermistor voltage drop and scales LED current below trip threshold - maintains safe junction temperature during burst flash. |
| Ultra-compact footprint | <23 mm² total solution size - achieved with 2.2-µH inductor and 1.685 mm × 1.685 mm DSBGA - saves board area in slim smartphone bezels. |
Applications
| Smartphone Camera Flash | Mobile Video Torch |
|---|---|
Use Scenario: Dual-LED flash illumination for 12–48 MP smartphone rear cameras during low-light still capture. IC Role / Device Role / Timing Role: Synchronous boost controller + dual high-side current regulator - delivers 1.2 A total with 32–1024 ms programmable duration and hardware STROBE triggering. Use Value: Enables consistent color temperature and intensity across dual LEDs while synchronizing flash pulse with image sensor exposure timing. | Use Scenario: Continuous low-power illumination for front-facing video calls and AR applications. IC Role / Device Role / Timing Role: Torch-mode current source - provides eight programmable levels (37.5–600 mA per channel) via I²C with hardware TORCH override. Use Value: Delivers stable, flicker-free illumination with <0.35% current mismatch, extending battery life versus PWM-dimming alternatives. |
| RF-Synchronized Flash Control | Thermally Protected LED Biasing |
Use Scenario: Coordinating flash pulses with LTE/5G power amplifier transmit bursts to avoid interference and power rail collapse. IC Role / Device Role / Timing Role: Dual TX inputs (TX1/TX2) act as hardware interrupts - force instantaneous transition from flash to torch mode (<20 µs settling time). Use Value: Prevents RF desense and maintains stable VBAT by reducing peak current draw during simultaneous PA transmit and flash events. | Use Scenario: High-reliability LED biasing in automotive interior lighting or industrial inspection equipment with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: LEDI/NTC pin configured as NTC comparator - triggers current scaleback when thermistor voltage crosses 0.947–1.157 V threshold. Use Value: Protects LEDs from thermal runaway without external microcontroller intervention, meeting AEC-Q200 stress requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3553TMX | Single-channel 1.2-A flash driver; no dual-LED support or TX synchronization inputs. | Limited to mono-LED modules; lacks RF-PA coordination capability. | Select when only one high-current LED is required and board space permits larger inductor footprint. |
| RT8542GQW | 2.5-A single-channel flash driver with integrated 5-V LDO; no I²C interface or thermal sensing. | Designed for high-power single-LED flash; no software configurability or NTC feedback. | Choose for cost-sensitive designs where fixed 5-V output and analog control suffice, and thermal monitoring is handled externally. |
Compared with LM3553TMX and RT8542GQW, the LM3554TMEEV uniquely combines dual-channel precision current regulation, hardware RF synchronization, and closed-loop thermal protection in a <23 mm² solution - making it the only option for modern dual-LED smartphone flash systems requiring coordinated, reliable, and thermally aware operation.
Availability
LM3554TMEEV is available at Aetrix Electronics and suitable for smartphone camera modules, mobile video torch systems, RF-coordinated flash subsystems, and thermally managed LED biasing applications requiring stable component supply and long-term manufacturability.
Supply support for LM3554TMEEV 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 LM3554TMEEV belongs to TI's mobile LED flash controller product line, engineered specifically for space-constrained, thermally sensitive smartphone camera systems requiring synchronized, efficient, and fault-resilient high-current LED drive.
FAQ
What is the maximum continuous LED current supported by the LM3554TMEEV?
The LM3554TMEEV supports up to 600 mA per channel continuously, for a total of 1.2 A across LED1 and LED2. This rating applies under recommended operating conditions (TA ≤ 85°C, proper PCB thermal design, and adequate input capacitance). At higher ambient temperatures or with insufficient copper area, derating may be required to maintain junction temperature below 125°C.
How does the LM3554TMEEV handle thermal protection during extended flash operation?
The LM3554TMEEV uses the LEDI/NTC pin in NTC mode to monitor LED temperature via an external thermistor. When the sensed voltage crosses the 0.947–1.157 V threshold, the device automatically scales back LED current to the torch level or shuts down, depending on register configuration. This hardware-based response operates independently of I²C communication, ensuring fail-safe thermal management.
Can the LM3554TMEEV operate without I²C communication enabled?
Yes - the LM3554TMEEV supports full hardware control: STROBE initiates flash, TX1/TORCH enables torch mode, HWEN provides active-low shutdown, and ENVM selects voltage-output mode. I²C is optional for fine-grained configuration (e.g., current levels, timeout, thermal thresholds), but basic functionality remains fully operational without it.
What is the purpose of the SW pin on the LM3554TMEEV, and what external components connect to it?
The SW pin is the internal switch node connecting the drains of the synchronous NMOS and PMOS power FETs. It must be connected directly to the switch-side terminal of the external 2.2-µH power inductor and to the anode of the input bypass capacitor (4.7 µF ceramic). Layout requires short, wide traces and tight coupling to GND to minimize ringing and EMI during 2-MHz switching.
Does the LM3554TMEEV support both flash and voltage-output modes simultaneously?
No - the LM3554TMEEV operates exclusively in either LED current-source mode (flash/torch/indicator) or constant-voltage output mode (4.5 V or 5 V), selected via the ENVM pin or I²C register bit [2]. These modes are mutually exclusive; the device cannot regulate LED current while delivering regulated output voltage to an external load.
LM3554TMEEV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- Current - Output / Channel:
- 600mA
- Outputs and Type:
- 2 Non-Isolated Outputs
- Voltage - Output:
- 5V
- Features:
- -
- Voltage - Input:
- 2.7V ~ 5.5V
- Contents:
- Board(s)
- Utilized IC / Part:
- LM3554
LM3554TMEEV FAQ
1.How can I place an order for LM3554TMEEV through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3554TMEEV 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 LM3554TMEEV reliable?
The price and inventory of LM3554TMEEV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3554TMEEV is usually 5 days.
3.What payment methods are accepted for LM3554TMEEV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3554TMEEV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3554TMEEV?
LM3554TMEEV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3554TMEEV 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 LM3554TMEEV?
For technical support, including LM3554TMEEV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3554TMEEV requirements.
6.How does Aetrix verify that LM3554TMEEV is sourced from the original manufacturer or authorized distributors?
All LM3554TMEEV 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 LM3554TMEEV meets industry standards.
7.What is the process for return or replacement of LM3554TMEEV?
All LM3554TMEEV units undergo pre-shipment inspection (PSI). If there is an issue with LM3554TMEEV, 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 LM3554TMEEV part is unused and in its original packaging.
Return procedure for LM3554TMEEV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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