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照明 LED 驅動器

LM3645

現行

具有 2A 高壓側電流來源的同步升壓四 LED 閃光燈驅動器

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產品規格表

LM3645

現行
產品規格表 立即訂購

產品詳細資料

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 mm × 1.75 mm)
  • 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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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 LM3645 Synchronous Boost Quad LED Flash Driver with 2-A High-Side Current Sources datasheet PDF | HTML 2024/9/26

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開發板

LM3644EVM — 具有 1.5A 高壓側電流來源的同步升壓雙 LED 閃光燈驅動器評估模組

LM3644EVM 可協助評估配備 1.5A 高壓側電流來源的 LM3643 同步升壓 LED 閃光燈驅動器。  2/4MHz 同步升壓為雙路可獨立控制的高壓側電流來源提供電源。  該電流來源可提供高達 1.5A 的電流，並有 128 個可編程位準可供選擇。   LM3644EVM 與支援軟體提供所有控制機制，以展示 LM3644 的功能（I2C、外部閃光燈與外部手電筒/Tx）。

使用指南: PDF
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開發板

LM3645EVM — LM3645 評估模組

LM3645 評估模組 (EVM) 可協助設計人員評估 LM3645 高電流 LED 驅動器的運作情形及性能。此裝置可透過 I2C 相容介面提供可配置性。可在閃光燈或手電筒模式下啟用。此模組運用安裝在 EVM 上的四顆 LED。
使用指南: PDF | HTML
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DSBGA (YCG) 25 Ultra Librarian
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