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LM3645

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具有 2A 高侧电流源的同步升压四路 LED 闪光灯驱动器

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LM3645

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产品详情

Input voltage type DC/DC Topology Boost, Current Source Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (max) (V) 5.5 Vout (min) (V) 2.5 Features I2C control, IR Mode, LED Thermal Monitor, Over Current Protection, Over Voltage Protection, Synchronous Rectification Operating temperature range (°C) -40 to 85 Dimming method Analog Number of channels 4 Rating Catalog
Input voltage type DC/DC Topology Boost, Current Source Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (max) (V) 5.5 Vout (min) (V) 2.5 Features I2C control, IR Mode, LED Thermal Monitor, Over Current Protection, Over Voltage Protection, Synchronous Rectification Operating temperature range (°C) -40 to 85 Dimming method Analog Number of channels 4 Rating Catalog
DSBGA (YCG) 25 3.0625 mm² 1.75 x 1.75
  • Quad independent led current source programmability
  • Accurate and programmable LED current range from 0.525 mA to 2 A
  • Optimized flash LED current during low battery conditions (IVFM)
  • > 85% efficiency in torch mode (at 100 mA) and flash mode (at 1 A to 2 A)
  • Grounded cathode LED operation for improved thermal management
  • Dual hardware strobe enable (STR1, STR2)
  • Synchronization input for RF power amplifier pulse events (TORCH/TX)
  • Hardware torch enable (TORCH/Tx)
  • Dual remote NTC monitoring (TEMP1, TEMP2)
  • Fixed output voltage mode
  • 1-MHz I2C-compatible interface
    • (I2C Address = 0x65)
  • Quad independent led current source programmability
  • Accurate and programmable LED current range from 0.525 mA to 2 A
  • Optimized flash LED current during low battery conditions (IVFM)
  • > 85% efficiency in torch mode (at 100 mA) and flash mode (at 1 A to 2 A)
  • Grounded cathode LED operation for improved thermal management
  • Dual hardware strobe enable (STR1, STR2)
  • Synchronization input for RF power amplifier pulse events (TORCH/TX)
  • Hardware torch enable (TORCH/Tx)
  • Dual remote NTC monitoring (TEMP1, TEMP2)
  • Fixed output voltage mode
  • 1-MHz I2C-compatible interface
    • (I2C Address = 0x65)

The LM3645 is a quad LED flash driver that provides a high level of adjustability within a small solution size. The LM3645 utilizes a synchronous boost converter to provide power to the quad 2A constant current LED sources. The quad 256 level current sources provide the flexibility to adjust the current ratios between LED1, LED2, LED3 and LED4 with each driver capable of delivering a maximum of 2A. An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.

Features of the LM3645 are controlled via an I2C-compatible interface. These features include: dual hardware flash pins and a hardware torch or Tx interrupt pin (STR1, STR2 and TORCH/TX), and dual NTC thermistor monitors. The device offers independently programmable currents in each output leg to drive the LEDs in a flash or movie mode (Torch) condition as well as a fast turn-on and turn-off IR Mode.

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

The LM3645 is a quad LED flash driver that provides a high level of adjustability within a small solution size. The LM3645 utilizes a synchronous boost converter to provide power to the quad 2A constant current LED sources. The quad 256 level current sources provide the flexibility to adjust the current ratios between LED1, LED2, LED3 and LED4 with each driver capable of delivering a maximum of 2A. An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.

Features of the LM3645 are controlled via an I2C-compatible interface. These features include: dual hardware flash pins and a hardware torch or Tx interrupt pin (STR1, STR2 and TORCH/TX), and dual NTC thermistor monitors. The device offers independently programmable currents in each output leg to drive the LEDs in a flash or movie mode (Torch) condition as well as a fast turn-on and turn-off IR Mode.

Two switching frequency options, overvoltage protection (OVP), and adjustable current limit allow for the use of tiny, low-profile inductors and 10µF ceramic capacitors. The device operates over a –40°C to +85°C ambient temperature range.
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* 数据表 LM3645 Synchronous Boost Quad LED Flash Driver with 2-A High-Side Current Sources 数据表 PDF | HTML 2024年 9月 26日

设计和开发

如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。

评估板

LM3644EVM — 具有 1.5A 高侧电流源的同步升压双 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 同步升压双 LED 闪存驱动器。  2/4 MHz 同步升压为双独立可控高侧电流源提供电源。  每个电流源可提供高达 1.5A 的电流，有 128 个可编程等级可供选择。  LM3644EVM 和支持软件提供所有的控制机制以演示 LM3644（I2C、外部 Strobe 和外部 Torch/Tx）的功能。

用户指南: PDF
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评估板

LM3645EVM — LM3645 评估模块

LM3645 评估模块 (EVM) 可帮助设计人员评估 LM3645 高电流 LED 驱动器的操作和性能。该器件提供通过兼容 I2C 的接口进行配置的功能。可在闪光灯模式或手电筒模式下启用该功能。该模块利用安装在 EVM 上的四个 LED。
用户指南: PDF | HTML
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DSBGA (YCG) 25 Ultra Librarian
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订购和质量

包含信息：
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息：
  • 制造厂地点
  • 封装厂地点

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