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LM3550

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具有自动 Vf 和 ESR 检测功能的 LED 闪光灯驱动器,适用于移动摄像机系统

产品详情

Input voltage type Linear Topology Charge pump Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (max) (V) 5.3 Vout (min) (V) 4.5 Iout (max) (A) 5 Iq (typ) (mA) 0.168 Features OVP Operating temperature range (°C) -30 to 85 Dimming method Analog, PWM Number of channels 1 Rating Catalog
Input voltage type Linear Topology Charge pump Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (max) (V) 5.3 Vout (min) (V) 4.5 Iout (max) (A) 5 Iq (typ) (mA) 0.168 Features OVP Operating temperature range (°C) -30 to 85 Dimming method Analog, PWM Number of channels 1 Rating Catalog
UQFN (NHU) 20 7.5 mm² 3 x 2.5
  • Up to 5 A Flash Current
  • 4 Selectable Super-Capacitor Charge Voltage Levels (4.5 V, 5 V, 5.3 V, Optimized)
  • Adjustable Torch Current (60 mA to 200 mA)
  • Ambient Light or LED Thermal Sensing With Current Scaleback
  • Dedicated Indicator LED Current Source
  • No Inductor Required
  • Programmable Flash Pulse Duration, and Torch and Flash Currents via I2C-Compatible Interface
  • True Shutdown (LED Disconnect)
  • Flash Timeout Protection
  • Low Profile 20-Pin UQFN Package
    (3 mm × 2.5 mm × 0.8 mm)
  • Up to 5 A Flash Current
  • 4 Selectable Super-Capacitor Charge Voltage Levels (4.5 V, 5 V, 5.3 V, Optimized)
  • Adjustable Torch Current (60 mA to 200 mA)
  • Ambient Light or LED Thermal Sensing With Current Scaleback
  • Dedicated Indicator LED Current Source
  • No Inductor Required
  • Programmable Flash Pulse Duration, and Torch and Flash Currents via I2C-Compatible Interface
  • True Shutdown (LED Disconnect)
  • Flash Timeout Protection
  • Low Profile 20-Pin UQFN Package
    (3 mm × 2.5 mm × 0.8 mm)

The LM3550 device is a low-noise, switched-capacitor DC-DC converter designed to operate as a current-limited and adjustable (up to 5.3 V) super-capacitor charger. The LM3550 features user-selectable termination voltages and provides one adjustable constant current output (up to 200 mA) and one NFET controller ideal for driving one or more high-current LEDs in a high-power flash mode or a low-power torch mode.

The LED current and flash pulse duration of the LM3550 can be programmed via an I2C-compatible interface. The STROBE pin allows the flash to be toggled via a flash-enable signal from a controller or camera module. The EOC pin sinks current when the output voltage reaches 95% of the final value.

The ALD/TEMP input pin allows either a light sensor to adjust the flash-current level based on the ambient light conditions, or it allows for over-temperature detection and protection of the LED during high-power operation or high ambient-temperature conditions.

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

The LM3550 device is a low-noise, switched-capacitor DC-DC converter designed to operate as a current-limited and adjustable (up to 5.3 V) super-capacitor charger. The LM3550 features user-selectable termination voltages and provides one adjustable constant current output (up to 200 mA) and one NFET controller ideal for driving one or more high-current LEDs in a high-power flash mode or a low-power torch mode.

The LED current and flash pulse duration of the LM3550 can be programmed via an I2C-compatible interface. The STROBE pin allows the flash to be toggled via a flash-enable signal from a controller or camera module. The EOC pin sinks current when the output voltage reaches 95% of the final value.

The ALD/TEMP input pin allows either a light sensor to adjust the flash-current level based on the ambient light conditions, or it allows for over-temperature detection and protection of the LED during high-power operation or high ambient-temperature conditions.

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

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类型 标题 下载最新的英语版本 日期
* 数据表 LM3550 5-A Super-Capacitor Flash LED Driver 数据表 (Rev. C) PDF | HTML 2016年 10月 19日
白皮书 常见 LED 功能和 LED 驱动器设计注意事项 英语版 2020年 9月 21日
选择指南 电源管理指南 2018 (Rev. K) 2018年 7月 31日
选择指南 电源管理指南 2018 (Rev. R) 2018年 6月 25日

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参考设计

TIDA-00376 — 压电式扬声器频闪灯通知参考设计

TIDA-00376 使用我们的工业压电式驱动器、闪光灯 LED 驱动器和超低功耗 FRAM 微控制器 (MCU) 来演示听觉和视觉通知子系统的实现方式,这些子系统主要应用于火灾警报终端设备系统。该参考设计展示了通过单个压电传感器和一个低输入电流和高光输出 LED 频闪灯生成的多警报音频率输出。
用户指南: PDF
原理图: PDF
英语版 (Rev.A): PDF
封装 引脚 CAD 符号、封装和 3D 模型
UQFN (NHU) 20 Ultra Librarian

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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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