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Texas Instruments LM3554TME/NOPB
- Part No.:
- LM3554TME/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFBGA, DSBGA
- Datasheet:
-
LM3554TME/NOPB.pdf
- Description:
- IC LED DRVR RGLTR I2C 16DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
LM3554TME/NOPB from Texas Instruments is a synchronous boost converter IC with dual high-side 600-mA LED current sources, I²C-compatible interface, and hardware flash/torch control. It operates from 2.5 V to 5.5 V input, delivers up to 1.2 A total LED current, supports 4.5-V or 5-V regulated output mode, and integrates open/short LED detection and thermal current scaleback for smartphone camera flash systems.
For engineers reviewing the LM3554TME/NOPB datasheet, LM3554TME/NOPB pinout, LM3554TME/NOPB application, or LM3554TME/NOPB equivalent, key selection criteria include its 2-MHz fixed-frequency current-mode architecture, programmable flash timeout (32–1024 ms), hardware STROBE-triggered flash enable, dual TX synchronization inputs for RF PA coordination, and grounded-cathode LED routing for thermal management.
Technical Context
The LM3554TME/NOPB implements a 2-MHz constant-frequency, current-mode PWM boost controller with synchronous NMOS/PMOS switching (150 mΩ each), supporting both LED current regulation and selectable 4.5-V/5-V voltage-output modes. Its dual high-side current sources provide independent 37.5 mA–1.2 A programmability per channel with <0.35% matching and 300 mV headroom (VHR) regulation.
Four logic-configurable pins-TX1/TORCH/GPIO1, ENVM/TX2/GPIO2, LEDI/NTC, and STROBE-enable hardware-triggered torch/flash transitions, RF power amplifier pulse synchronization, NTC-based thermal derating, and active-low hardware shutdown (HWEN). The device includes five protection features: input voltage monitor, overvoltage protection (5.4–5.7 V), output short-circuit limit (550 mA), open/short LED detection, and thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports single-cell Li-ion and USB-powered operation without external LDO. |
| Max Total LED Current | 1.2 A - dual 600-mA high-side current sources enable bright dual-LED flash in compact camera modules. |
| Switching Frequency | 1.75–2.23 MHz - enables use of small 2.2-µH inductors and <23 mm² total solution size. |
| Output Voltage Options | 4.5 V or 5 V - software-selectable regulated voltage mode for auxiliary system rail generation. |
| I²C Interface Speed | 400 kHz - compatible with standard microcontroller I²C peripherals for real-time brightness and timing control. |
| LED Current Accuracy | ±6% at 600 mA - ensures consistent flash intensity across production units and temperature range (–30°C to +85°C). |
| Thermal Shutdown Threshold | 150°C (typical) - protects against sustained overloads while allowing transient peak flash operation. |
| Quiescent Current | 630 µA - minimizes standby battery drain in always-on mobile imaging subsystems. |
Pinout & Package
LM3554TME/NOPB uses a 16-pin DSBGA (YFQ) package measuring 1.685 mm × 1.685 mm with 0.4-mm pitch, optimized for ultra-thin mobile camera modules.
| 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 strings and optional 4.5/5-V system rail. |
| A3/B3 SW | Power Switch Node | Internal NMOS/PMOS switch connection - requires low-ESR ceramic capacitor and proper layout for EMI control. |
| A4/B4 GND | Ground Reference | Primary ground return for power and analog circuits - must be low-impedance plane for stability and thermal performance. |
| B1 LED2 | Power Output | High-side current source for second flash LED - matched to LED1 for balanced dual-LED illumination. |
| C1 LEDI/NTC | I/O Configurable | Either low-power indicator LED driver (2.3–8.2 mA) or NTC thermistor comparator input (0.947–1.157 V trip) for thermal derating. |
| C2 TX1/TORCH/GPIO1 | I/O Configurable | Hardware torch enable, RF PA sync input (TX1), or general-purpose I/O - internal 300-kΩ pulldown ensures defined state. |
| C3 STROBE | Digital Input | Active-high hardware flash trigger - initiates immediate 1.2-A flash pulse independent of I²C state. |
| C4 IN | Power Input | Main supply input - requires ≥4.7-µF ceramic bypass capacitor to suppress input ripple and ensure stability. |
| D1 ENVM/TX2/GPIO2/INT | I/O Configurable | Voltage-output mode enable, dual-polarity RF sync (TX2), GPIO, or interrupt output - supports system-level coordination. |
| D2 SDA | I²C Data | Open-drain bidirectional serial data line - requires external pull-up resistor (typically 2.2–10 kΩ). |
| D3 SCL | I²C Clock | Input-only serial clock line - drives I²C communication at up to 400 kHz. |
| D4 HWEN | Digital Input | Active-low hardware enable - forces full shutdown during system fault conditions, overriding all software controls. |
Key Features
| Feature | Design Value |
|---|---|
| Dual high-side current sources | Enables grounded-cathode LED layout for superior thermal dissipation and simplified PCB routing in slim camera modules. |
| Hardware flash/torch enable | STROBE and TX1/TORCH pins allow deterministic, low-latency flash activation without MCU intervention or I²C latency. |
| RF power amplifier synchronization | Dual TX inputs (TX1, TX2) coordinate flash pulses with RF transmit events to avoid interference and battery sag. |
| Programmable flash timeout | 32 discrete steps from 32 ms to 1024 ms via I²C register - prevents overheating and enables compliance with safety standards. |
| LED thermal sensing & current scaleback | LEDI/NTC pin supports NTC thermistor feedback to automatically reduce flash current when temperature exceeds threshold. |
| Open/short LED fault detection | Integrated diagnostics flag faults on I²C bus - enables system-level error reporting and graceful degradation (e.g., single-LED fallback). |
Applications
| Smartphone Camera Flash | Mobile Video Conferencing Light |
|---|---|
Use Scenario: Dual-LED flash illumination for rear-facing smartphone cameras during low-light still capture and video recording. IC Role / Device Role / Timing Role: Primary flash controller managing synchronized 1.2-A current delivery, thermal derating, and RF-coordinated timing via TX inputs. Use Value: Enables high-intensity, color-accurate illumination with <20 µs flash-to-torch settling time and automatic current reduction above 135°C junction temperature. | Use Scenario: Always-on front-facing LED ring light for video calls on tablets and foldable phones. IC Role / Device Role / Timing Role: Torch-mode current regulator delivering stable 17–600 mA per LED with I²C-adjustable brightness and hardware torch enable. Use Value: Provides flicker-free, dimmable illumination using programmable 8-level torch current settings and <0.35% LED current matching between channels. |
| USB-Powered Portable Scanner | Industrial Barcode Reader |
Use Scenario: Short-duration, high-current LED flash for CMOS image sensor exposure in handheld document scanners. IC Role / Device Role / Timing Role: Boost converter + flash driver supplying regulated 5-V rail and precise 600-mA flash pulses triggered by STROBE. Use Value: Delivers >90% efficiency and 23 mm² solution size while maintaining ±6% current accuracy across 2.5–5.5 V USB input range. | Use Scenario: Ruggedized handheld barcode reader requiring reliable flash illumination under wide temperature (-30°C to +85°C) and battery-voltage variation. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with input voltage monitoring, open/short LED detection, and active-low HWEN for fail-safe shutdown. Use Value: Ensures continuous operation via VIN monitor trip (3.09 V typical) and automatic recovery from LED faults without host MCU involvement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED flash controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3553TME/NOPB | Single-channel 1.2-A flash driver; lacks dual LED outputs and TX2 input; same DSBGA-16 package. | Suitable only for single-LED flash configurations; no RF sync capability for dual-path PA systems. | Select when board space or cost constraints eliminate need for dual-LED support or advanced synchronization. |
| RT8542GQW | 2.5-A single-channel flash driver with integrated 5-V LDO; no I²C interface; uses QFN-16 package (3 mm × 3 mm). | Requires external MCU GPIO for brightness control; larger footprint; no thermal sensing or open/short detection. | Choose for high-current single-LED applications where I²C control and diagnostics are not required. |
Compared with LM3553TME/NOPB, the LM3554TME/NOPB adds dual independent current sources and TX2 synchronization, enabling true dual-LED flash with RF coexistence. Versus RT8542GQW, it trades raw current capacity for precision digital control, comprehensive fault reporting, and ultra-compact DSBGA packaging critical for modern smartphones.
Availability
LM3554TME/NOPB is available at Aetrix Electronics and suitable for smartphone camera modules, mobile video conferencing systems, portable document scanners, and industrial barcode readers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3554TME/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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad automotive, industrial, and personal electronics portfolios.
The LM3554TME/NOPB belongs to TI's mobile LED lighting controller product line, designed specifically for high-efficiency, thermally robust flash and torch illumination in space-constrained portable imaging systems.
FAQ
What is the maximum total LED current supported by the LM3554TME/NOPB?
The LM3554TME/NOPB supports a maximum total LED current of 1.2 A, delivered as two independent 600-mA high-side current sources (LED1 and LED2). This rating is confirmed across the full operating temperature range (–30°C to +85°C) and input voltage range (2.5 V to 5.5 V), with typical current accuracy of ±6% at the 600-mA setting. The LM3554TME/NOPB maintains this performance while providing <0.35% matching between channels under matched load conditions.
Does the LM3554TME/NOPB support hardware-triggered flash mode independent of I²C communication?
Yes, the LM3554TME/NOPB supports fully autonomous hardware-triggered flash mode via the STROBE pin. Driving STROBE high immediately initiates a flash pulse at the preconfigured current level (up to 1.2 A total), bypassing I²C register access entirely. This feature ensures sub-microsecond latency and deterministic timing for critical imaging sequences. The LM3554TME/NOPB also allows hardware torch enable via the TX1/TORCH pin, and provides active-low hardware shutdown through HWEN for system-level fault containment.
How does the LM3554TME/NOPB handle thermal management during extended flash operation?
The LM3554TME/NOPB implements dual-layer thermal protection: an internal junction thermal shutdown at 150°C (typical), and user-configurable LED thermal derating via the LEDI/NTC pin. When configured as an NTC input, the LM3554TME/NOPB monitors external thermistor voltage and automatically scales back LED current upon crossing the 0.947–1.157 V trip threshold. This prevents thermal runaway while maintaining illumination functionality at reduced intensity - a critical capability for sustained torch mode or repeated flash bursts in enclosed camera modules.
Can the LM3554TME/NOPB operate as a regulated voltage source instead of an LED driver?
Yes, the LM3554TME/NOPB can operate in voltage-output mode, generating a regulated 4.5-V or 5-V output. This mode is enabled via the ENVM pin or I²C register bit [2] of the Torch Brightness Register (0xA0). In voltage-output mode, the LM3554TME/NOPB delivers up to ~5 W of output power and switches to pulsed frequency modulation at light loads to maintain high efficiency. Unlike LED mode, voltage-output mode does not engage the high-side current sources - LED1, LED2, and LEDI/NTC remain inactive unless explicitly enabled via separate register control.
What protection features are integrated into the LM3554TME/NOPB?
The LM3554TME/NOPB integrates five dedicated protection features: (1) software-selectable input voltage monitor (trip at 3.09 V typical), (2) overvoltage protection (5.4–5.7 V trip), (3) output short-circuit current limit (550 mA), (4) open/short LED detection with I²C flag reporting, and (5) thermal shutdown at 150°C. These functions operate independently of I²C control and remain active even during firmware hangs or communication loss - ensuring robust operation in safety-critical mobile imaging applications. Each protection event generates a corresponding status bit accessible via the LM3554TME/NOPB's I²C interface.
LM3554TME/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
LM3554TME/NOPB FAQ
1.How can I place an order for LM3554TME/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3554TME/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 LM3554TME/NOPB reliable?
The price and inventory of LM3554TME/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3554TME/NOPB is usually 5 days.
3.What payment methods are accepted for LM3554TME/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3554TME/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3554TME/NOPB?
LM3554TME/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3554TME/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 LM3554TME/NOPB?
For technical support, including LM3554TME/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3554TME/NOPB requirements.
6.How does Aetrix verify that LM3554TME/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3554TME/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 LM3554TME/NOPB meets industry standards.
7.What is the process for return or replacement of LM3554TME/NOPB?
All LM3554TME/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3554TME/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 LM3554TME/NOPB part is unused and in its original packaging.
Return procedure for LM3554TME/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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