首頁 電源管理 LED 驅動器 照明 LED 驅動器
首頁
電源管理
LED 驅動器
照明 LED 驅動器

LM3643

現行

雙 LED 閃光燈驅動器，最高可達 1.5A

立即訂購
產品規格表

LM3643

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 mode Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (max) (V) 5.5 Vout (min) (V) 2.5 Iout (max) (A) 1.5 Iq (typ) (mA) 0.3 Features I2C control, IR Mode 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) 1.5 Iq (typ) (mA) 0.3 Features I2C control, IR Mode 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
  • 1.5 A Total Allowed LED Current During Operation
    (ILED1 + ILED2 = 1.5 A)
  • Dual Independent LED Current Source Programmability
  • Accurate and Programmable LED Current Range from
    1.4 mA to 1.5 A
  • Optimized Flash LED Current During Low Battery
    Conditions (IVFM)
  • > 85% Efficiency in Torch Mode (@ 100 mA) and
    Flash Mode (@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
    • LM3643 (I2C Address = 0x63)
    • LM3643A (I2C Address = 0x67)
  • 1.5 A Total Allowed LED Current During Operation
    (ILED1 + ILED2 = 1.5 A)
  • Dual Independent LED Current Source Programmability
  • Accurate and Programmable LED Current Range from
    1.4 mA to 1.5 A
  • Optimized Flash LED Current During Low Battery
    Conditions (IVFM)
  • > 85% Efficiency in Torch Mode (@ 100 mA) and
    Flash Mode (@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
    • LM3643 (I2C Address = 0x63)
    • LM3643A (I2C Address = 0x67)

The LM3643 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The LM3643 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 total LED current the LM3643 boost can deliver is 1.5 A (ILED1 + ILED2 ). The dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2 with each driver capable of delivering a maximum of 1.5 A (ex: ILED1 = 1.5 A and ILED2 = 0FF, ILED1 = 0FF and ILED2 = 1.5 A, or a current configuration with a current less than 1.5 A , ILED1 = 950 mA and ILED2 = 250 mA). An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.

Features of the LM3643 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.

The LM3643 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The LM3643 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 total LED current the LM3643 boost can deliver is 1.5 A (ILED1 + ILED2 ). The dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2 with each driver capable of delivering a maximum of 1.5 A (ex: ILED1 = 1.5 A and ILED2 = 0FF, ILED1 = 0FF and ILED2 = 1.5 A, or a current configuration with a current less than 1.5 A , ILED1 = 950 mA and ILED2 = 250 mA). An adaptive regulation method ensures the current sources remain in regulation and maximizes efficiency.

Features of the LM3643 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.
open-in-new 尋找其它 照明 LED 驅動器
下載 觀看有字幕稿的影片 影片

技術文件

star =TI 所選的此產品重要文件
找不到結果。請清除您的搜尋條件，然後再試一次。
檢視所有 8
類型 標題 日期
* Data sheet LM3643 Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources datasheet (Rev. A) PDF | HTML 2014年 11月 17日
Application note No Boost Inductor Design with LM364x for Long-Time Focusing in Camera Module PDF | HTML 2022年 2月 16日
White paper Common LED Functions and LED Driver Design Considerations 2020年 9月 21日
Application note LED Flash-Protection Features 2017年 8月 23日
Application note Using Flash LED Drivers for Infrared (IR) LED Applications 2017年 3月 20日
Application note Using the LM3643/4/8 in an Inductorless and/or Simplified PCB Routing Configurat 2016年 10月 11日
Technical article Shrink your LED flash solution PDF | HTML 2015年 12月 10日
EVM User's guide LM3643EVM User’s Guide 2014年 8月 19日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

LM3643EVM — 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

The LM3643EVM 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 up to 1.5A of total LED current to the dual independently controllable high side current sources.  Each current source can (...)

使用指南: PDF
TI.com 無法提供
開發模組 (EVM) 的 GUI

SNVC174 — LM3643EVM GUI

支援產品和硬體

支援產品和硬體

產品
照明 LED 驅動器
LM3643 — 雙 LED 閃光燈驅動器，最高可達 1.5A
硬體開發
開發板
LM3643EVM — 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
下載
模擬型號

LM3643 PSpice Transient Model

SNVMA17.ZIP (77 KB) - PSpice Model
下載
模擬工具

PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

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 (...)
要求
封裝 引腳 下載
DSBGA (YFF) 12 檢視選項
適用 TI 的評估品項標準條款與條件。

訂購與品質

內含資訊：
  • RoHS
  • REACH
  • 產品標記
  • 鉛塗層/球物料
  • MSL 等級/回焊峰值
  • MTBF/FIT 估算值
  • 材料內容
  • 資格摘要
  • 進行中可靠性監測
內含資訊：
  • 晶圓廠位置
  • 組裝地點

建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。

支援與培訓

內含 TI 工程師技術支援的 TI E2E™ 論壇

以英文檢視所有論壇主題

內容係由 TI 和社群貢獻者依「現狀」提供，且不構成 TI 規範。檢視使用條款。

若有關於品質、封裝或訂購 TI 產品的問題，請參閱 TI 支援。​​​​​​​​​​​​​​

影片