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LM3644

ACTIVO

Controlador LED de flash de fuente de corriente de 1.5 A doble para cámara

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LM3644

ACTIVO
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Detalles del producto

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) 2.5 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 Number of channels 2 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) 2.5 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 Number of channels 2 Rating Catalog
DSBGA (YFF) 12 2.52000000000000018 mm² 1.4000000000000001 x 1.8
  • Dual Independent 1.5-A LED Current Source Programmability
  • Accurate and Programmable LED Current Range from 1.4 mA to 1.5 A
  • Torch Currents up to 360 mA (LM3644TT)
  • Flash Timeout Values up to 1.6 seconds (LM3644TT)
  • 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
    • LM3644 (I2C Address = 0x63)
  • Dual Independent 1.5-A LED Current Source Programmability
  • Accurate and Programmable LED Current Range from 1.4 mA to 1.5 A
  • Torch Currents up to 360 mA (LM3644TT)
  • Flash Timeout Values up to 1.6 seconds (LM3644TT)
  • 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
    • LM3644 (I2C Address = 0x63)

The LM3644 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The LM3644 utilizes a 2-MHz or 4-MHz fixed-frequency synchronous boost converter to provide power to the dual 1.5-A constant current LED sources. The dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2. An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.

Features of the LM3644 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 independently programmable currents in each output leg to drive the LEDs in a Flash or 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 LM3644 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The LM3644 utilizes a 2-MHz or 4-MHz fixed-frequency synchronous boost converter to provide power to the dual 1.5-A constant current LED sources. The dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2. An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.

Features of the LM3644 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 independently programmable currents in each output leg to drive the LEDs in a Flash or 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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Documentación técnica

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* Data sheet LM3644 Dual 1.5-A Current Source Camera Flash LED Driver datasheet (Rev. E) PDF | HTML 08 sep 2016
Application note No Boost Inductor Design with LM364x for Long-Time Focusing in Camera Module PDF | HTML 16 feb 2022
White paper Common LED Functions and LED Driver Design Considerations 21 sep 2020
Application note LED Flash-Protection Features 23 ago 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 Shrink your LED flash solution PDF | HTML 10 dic 2015
User guide LM3644 User Guide 28 may 2014

Diseño y desarrollo

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Placa de evaluación

LM3644EVM — Módulo de evaluación de controlador de flash LED doble de impulso síncrono con fuentes de corriente

The LM3644EVM aids in evaluation of the LM3643 Synchronous Boost Dual LED Flash Driver W/ 1.5A High-Side Current Sources.  The 2/4 MHz synchronous boost provides power to the dual independently controllable high side current sources.  Each current source can provide a current up to 1.5A (...)

Guía del usuario: PDF
No disponible en TI.com
GUI para el módulo de evaluación (EVM)

SNVC175 — LM3644EVM

Productos y hardware compatibles

Productos y hardware compatibles

Productos
Controladores LED de iluminación
LM3644 — Controlador LED de flash de fuente de corriente de 1.5 A doble para cámara
Desarrollo de hardware
Placa de evaluación
LM3644EVM — Módulo de evaluación de controlador de flash LED doble de impulso síncrono con fuentes de corriente
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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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  • Lugar de fabricación
  • Lugar de ensamblaje

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