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LM3644

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双 1.5A 电流源摄像头 LED 闪光灯驱动器

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数据表

LM3644

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数据表 立即订购

产品详情

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 (— mm × — mm)
  • 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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技术文档

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顶层文档 类型 标题 格式选项 下载最新的英语版本 日期
* 数据表 LM3644 Dual 1.5-A Current Source Camera Flash LED Driver 数据表 (Rev. E) PDF | HTML 2016-9-8
应用手册 采用 LM364x 的无升压电感器设计，用于相机模块的长时间调焦 PDF | HTML 英语版 PDF | HTML 2022-6-11
白皮书 常见 LED 功能和 LED 驱动器设计注意事项 英语版 2020-9-21
应用手册 LED Flash-Protection Features 2017-8-23
应用手册 Using Flash LED Drivers for Infrared (IR) LED Applications 2017-3-20
应用手册 Using the LM3643/4/8 in an Inductorless and/or Simplified PCB Routing Configurat 2016-10-11
技术文章 Shrink your LED flash solution PDF | HTML 2015-12-10

设计与开发

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评估板

LM3644EVM — 具有 1.5A 高侧电流源的同步升压双路 LED 闪存驱动器评估模块

LM3644EVM 可帮助评估具有 1.5A 高侧电流源的 LM3643 同步升压 LED 双路闪光灯驱动器。  2/4MHz 同步升压为双路独立可控高侧电流源供电。  每个电流源可提供高达 1.5A 的电流和 128 个可编程级别供选择。   LM3644EVM 和支持软件提供所有控制机制，以演示 LM3644 的功能（I2C、外部闪光和外部手电筒/发射器）。

用户指南: PDF
支持的产品和硬件
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无货
评估模块 (EVM) 用 GUI

SNVC175 — LM3644EVM

支持的产品和硬件
封装 引脚 CAD 符号、封装和 3D 模型
DSBGA (YFF) 12 Ultra Librarian
适用于评估类项目的 TI 标准条款与条件。

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