Product details


Vin (Min) (V) 2.7 Vin (Max) (V) 5.5 Number of LEDs 2 Iout (Max) (A) 1.2 Iq (Typ) (mA) 0.63 Features I2C Control Operating temperature range (C) -30 to 85 open-in-new Find other Flash LED drivers

Package | Pins | Size

DSBGA (YFQ) 16 0 mm² 1.695 x 1.695 open-in-new Find other Flash LED drivers


  • Input Voltage: 2.5 V to 5.5 V
  • Programmable 4.5-V or 5-V Constant Output Voltage
  • Dual High-Side Current Sources
  • Grounded Cathode Allowing for Better Heat Sinking and LED Routing
  • > 90% Efficiency
  • Ultra-Small Solution Size: < 23 mm2
  • Four Operating Modes: Torch, Flash, LED Indicator, and Voltage Output
  • Accurate and Programmable LED Current from 37.5 mA to 1.2 A
  • Hardware Flash and Torch Enable
  • LED Thermal Sensing and Current Scaleback
  • Software Selectable Input Voltage Monitor
  • Programmable Flash Timeout
  • Dual Synchronization Inputs for RF Power-Amplifier Pulse Events
  • Open and Short LED Detection
  • Active High Hardware Enable for Protection Against System Faults
  • 400-kHz I2C-Compatible Interface
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The LM3554 is a 2-MHz fixed-frequency, current-mode synchronous boost converter. The device is designed to operate as a dual 600-mA (1.2 A total) constant-current driver for high-current white LEDs, or as a regulated 4.5-V or 5-V voltage source.

The main features include: an I2C-compatible interface for controlling the LED current or the desired output voltage, a hardware flash enable input for direct triggering of the flash pulse, and dual TX inputs which force the flash pulse into a low-current torch mode allowing for synchronization to RF power amplifier events or other high-current conditions. Additionally, an active high hardware enable (HWEN) input provides a hardware shutdown during system software failures.

Five protection features are available within the LM3554 including a software selectable input voltage monitor, an internal comparator for interfacing with an external temperature sensor, four selectable current limits to ensure the battery current is kept below a predetermined peak level, an overvoltage protection feature to limit the output voltage during LED open circuits, and an output short circuit protection which limits the output current during shorts to GND.

For all available packages, see the orderable addendum at the end of the data sheet.
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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LM3554 Synchronous Boost Converter With 1.2-A Dual High-Side LED Drivers and I2C-Compatible Interface datasheet (Rev. C) Feb. 26, 2016
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical articles Take better selfies with innovative LED flashes Nov. 18, 2014
Technical articles Solving the automotive EMI issues in new cars with all the screens Sep. 10, 2014
User guides AN-1742 LM3554 Evaluation Board (Rev. B) Jul. 23, 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
  • Dual High Side Current Sources
  • Grounded Cathode Allowing for Better Heat Sinking and LED Routing
  • >90% Efficiency
  • Ultra-Small Solution Size: < 23mm2
  • Four Operating Modes: Torch, Flash, LED Indicator and Voltage Output
  • Accurate and Programmable LED Current from 37.5mA to 1.2A
  • Programmable 4.5V or 5.0V (...)
SNVC046.ZIP (58 KB)

Software development

Linux Driver for LM355X
LM355XSW-LINUX The Linux driver supports the LM355X series of LED Drivers. The Linux driver supports communication through the I2C bus and interfaces with the LED sub-system.


Linux Mainline Status

Available in Linux Main line: Yes
Available through N/A

Supported Devices:

  • lm3554
  • lm3556


Linux Source Files

The (...)

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
DSBGA (YFQ) 16 View options

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