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LM3556

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LM3556 1.5A Inductive white LED Camera flash Device

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Data sheet

LM3556

ACTIVE
Data sheet Order now

Product details

Input voltage type DC/DC Topology Boost, current mode Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (max) (V) 5.5 Vout (min) (V) 2.5 Iout (max) (A) 1.5 Iq (typ) (mA) 0.75 Features I2C control Operating temperature range (°C) -40 to 85 Dimming method Analog, PWM Number of channels 1 Rating Catalog
Input voltage type DC/DC Topology Boost, current mode Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (max) (V) 5.5 Vout (min) (V) 2.5 Iout (max) (A) 1.5 Iq (typ) (mA) 0.75 Features I2C control Operating temperature range (°C) -40 to 85 Dimming method Analog, PWM Number of channels 1 Rating Catalog
DSBGA (YFQ) 16 3.24 mm² 1.8 x 1.8
  • Grounded Cathode LED Operation for Improved Thermal Management
  • 1.5-A High-Side Current Source for Single LED
  • Accurate and Programmable LED Current from 46.9 mA to 1.5 A
  • > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
  • Small Solution Size: < 20 mm2
  • LED Thermal Sensing and Current Scale-Back
  • Soft-Start Operation for Battery Protection
  • Hardware Enable Pin
  • Hardware Torch Enable
  • Hardware Strobe Enable
  • Synchronization Input for RF Power Amplifier Pulse Events
  • VIN Flash Monitor Optimization
  • 400-kHz I2C-Compatible Interface
  • I2C-Compatible Programmable NTC Trip Point
  • 0.4-mm Pitch, 16-Pin DSBGA Package
  • Grounded Cathode LED Operation for Improved Thermal Management
  • 1.5-A High-Side Current Source for Single LED
  • Accurate and Programmable LED Current from 46.9 mA to 1.5 A
  • > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
  • Small Solution Size: < 20 mm2
  • LED Thermal Sensing and Current Scale-Back
  • Soft-Start Operation for Battery Protection
  • Hardware Enable Pin
  • Hardware Torch Enable
  • Hardware Strobe Enable
  • Synchronization Input for RF Power Amplifier Pulse Events
  • VIN Flash Monitor Optimization
  • 400-kHz I2C-Compatible Interface
  • I2C-Compatible Programmable NTC Trip Point
  • 0.4-mm Pitch, 16-Pin DSBGA Package

The LM3556 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing flash current up to 1.5 A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.

The LM3556 is controlled via an I2C-compatible interface. Features include: a hardware flash enable (STROBE) allowing a logic input to trigger the flash pulse, a hardware torch enable (TORCH) for Movie Mode or flashlight functions, a TX input which forces the flash pulse into a low-current Torch Mode allowing for synchronization to RF power amplifier events or other high-current conditions, and an integrated comparator designed to monitor an NTC thermistor and provide an interrupt to the LED current. With a fast 1-μs transition from 0 mA to
46.9 mA, the TORCH input pin can be used to develop custom LED current waveforms.

The 4-MHz switching frequency, overvoltage protection and adjustable current limit allow for the use of tiny, low-profile inductors and 10-µF ceramic capacitors. The device is operates over a −40°C to +85°C temperature range.

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

The LM3556 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing flash current up to 1.5 A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.

The LM3556 is controlled via an I2C-compatible interface. Features include: a hardware flash enable (STROBE) allowing a logic input to trigger the flash pulse, a hardware torch enable (TORCH) for Movie Mode or flashlight functions, a TX input which forces the flash pulse into a low-current Torch Mode allowing for synchronization to RF power amplifier events or other high-current conditions, and an integrated comparator designed to monitor an NTC thermistor and provide an interrupt to the LED current. With a fast 1-μs transition from 0 mA to
46.9 mA, the TORCH input pin can be used to develop custom LED current waveforms.

The 4-MHz switching frequency, overvoltage protection and adjustable current limit allow for the use of tiny, low-profile inductors and 10-µF ceramic capacitors. The device is operates over a −40°C to +85°C temperature range.

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

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Type Title Date
* Data sheet LM3556 1.5-A Synchronous Boost LED Flash Driver With High-Side Current Source datasheet (Rev. D) PDF | HTML 23 Oct 2015
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note AN-2259 1.5A Synchronous Boost LED Flash Drvr w/ High-Side Cur Source Eval Board (Rev. A) 30 Apr 2013

Design & development

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

Driver or library

LM355XSW-LINUX — Linux Driver for LM355X

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 git.ti.com: N/A

Supported Devices:

  • lm3554
  • lm3556

 

Linux Source Files

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GUI for evaluation module (EVM)

SNVC065 — GUI software for LM3556TMEV

Supported products & hardware

Supported products & hardware

Products
Illumination LED drivers
LM3556 — LM3556 1.5A Inductive white LED Camera flash Device
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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 (...)
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