Product details

Input voltage (type) DC/DC Topology Boost, Current Mode Vin (Min) (V) 2.5 Vin (Max) (V) 5.5 Iout (Max) (A) 1.5 Iq (Typ) (mA) 0.3 Features I2C Control, IR Mode, LED Thermal Monitor, OVP, Over Current Protection, Synchronous Rectification Operating temperature range (C) -40 to 85 Dimming method Analog, PWM
Input voltage (type) DC/DC Topology Boost, Current Mode Vin (Min) (V) 2.5 Vin (Max) (V) 5.5 Iout (Max) (A) 1.5 Iq (Typ) (mA) 0.3 Features I2C Control, IR Mode, LED Thermal Monitor, OVP, Over Current Protection, Synchronous Rectification Operating temperature range (C) -40 to 85 Dimming method Analog, PWM
DSBGA (YFF) 12 2 mm² 1.32 x 1.7
  • 1.5-A LED Current Source Programmability
  • Accurate and Programmable LED Current Range from 1.954 mA to 1.5 A
  • Torch Currents up to 500 mA (LM3648TT)
  • Flash Timeout Values up to 1.6 Seconds (LM3648TT)
  • Optimized Flash LED Current During Low Battery Conditions (IVFM)
  • > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
  • Grounded Cathode LED Operation for Improved Thermal Management
  • Small Solution Size: < 16 mm2
  • Hardware Strobe Enable (STROBE)
  • Synchronization Input for RF Power Amplifier Pulse Events (TX)
  • Hardware Torch Enable (TORCH/TEMP)
  • Remote NTC Monitoring (TORCH/TEMP)
  • 400-kHz I2C-Compatible Interface
    • LM3648 (I2C Address = 0x63)
  • 1.5-A LED Current Source Programmability
  • Accurate and Programmable LED Current Range from 1.954 mA to 1.5 A
  • Torch Currents up to 500 mA (LM3648TT)
  • Flash Timeout Values up to 1.6 Seconds (LM3648TT)
  • Optimized Flash LED Current During Low Battery Conditions (IVFM)
  • > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
  • Grounded Cathode LED Operation for Improved Thermal Management
  • Small Solution Size: < 16 mm2
  • Hardware Strobe Enable (STROBE)
  • Synchronization Input for RF Power Amplifier Pulse Events (TX)
  • Hardware Torch Enable (TORCH/TEMP)
  • Remote NTC Monitoring (TORCH/TEMP)
  • 400-kHz I2C-Compatible Interface
    • LM3648 (I2C Address = 0x63)

The LM3648 is an LED flash driver that provides a high level of adjustability within a small solution size. The LM3648 utilizes a 2-MHz or 4-MHz fixed-frequency synchronous boost converter to provide power to the 1.5-A constant current LED source. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.

Features of the LM3648 are controlled via an I2C-compatible interface. These features include: hardware flash and hardware torch pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC thermistor monitor. The device offers 64 programmable currents in Flash and 128 levels in Movie Mode (Torch) condition.

The 2-MHz or 4-MHz switching frequency options, overvoltage protection (OVP), and adjustable current limit allow for the use of tiny, low-profile inductors and (10-µF) ceramic capacitors. The device operates over a –40°C to +85°C ambient temperature range.

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

The LM3648 is an LED flash driver that provides a high level of adjustability within a small solution size. The LM3648 utilizes a 2-MHz or 4-MHz fixed-frequency synchronous boost converter to provide power to the 1.5-A constant current LED source. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.

Features of the LM3648 are controlled via an I2C-compatible interface. These features include: hardware flash and hardware torch pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC thermistor monitor. The device offers 64 programmable currents in Flash and 128 levels in Movie Mode (Torch) condition.

The 2-MHz or 4-MHz switching frequency options, overvoltage protection (OVP), and adjustable current limit allow for the use of tiny, low-profile inductors and (10-µF) ceramic capacitors. The device operates over a –40°C to +85°C ambient 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 LM3648 Synchronous Boost LED Flash Driver with 1.5-A High-Side Current Source datasheet (Rev. D) 18 Nov 2016
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Application note LED Flash-Protection Features 23 Aug 2017
Application note Using Flash LED Drivers for Infrared (IR) LED Applications 20 Mar 2017
Application note Using the LM3643/4/8 in an Inductorless and/or Simplified PCB Routing Configurat 11 Oct 2016
Technical article Here's how body electronics and lighting technology are changing the driving experience 26 Sep 2016
Technical article LED brightness adjustment: high-frequency PWM dimming 26 Aug 2016
Technical article Shrink your LED flash solution 10 Dec 2015
User guide Using the LM3648EVM Evaluation Module 26 Jan 2015
Technical article Take better selfies with innovative LED flashes 18 Nov 2014

Design & development

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

Evaluation board

LM3648EVM — LM3648EVM Synchronous Boost LED Flash Driver EVM W/ 1.5A High-Side Current Source

The LM3648EVM aids in evaluation of the LM3648 Synchronous Boost LED Flash Driver W/ 1.5A High-Side Current Source.  The 2/4 MHz synchronous boost provides power to the controllable high side current sourcs.  The current source can provide a current up to 1.5A with 64 programmable levels (...)

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PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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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DSBGA (YFF) 12 View options

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