LT3744 是一款固定频率、同步降压型 DC/DC 控制器，专为以高达 20A 的连续电流或 40A 的脉冲电流来驱动一个 LED 负载而设计。峰值电流模式控制器将在一个从 VEE 至 VIN 的宽输出电压范围内保持 ±3% 的 LED 电流调整率。通过允许 VEE 浮动至负电压，可采用一个简单的单降压输出级从单个锂离子电池来驱动多个串联 LED。PWM 调光利用 PWM 引脚来实现。已调 LED 电流利用 CTRL 引脚上的模拟电压来设定。稳定电压和过压保护由一个连接在输出和 FB 引脚之间的分压器来设定。开关频率可通过 RT 引脚上的一个外部电阻器在 100kHz 至 1MHz 的范围内进行设置。 

该器件的其他特点包括一个准确的外部基准电压、一个用于热降额调节电流的控制输入、一个准确的 EN/UVLO 引脚、一个漏极开路输出故障标记、过压闭锁 (OVLO)、频率同步和热停机功能。

• 用于 DLP 投影机的 LED 驱动器
• 平视显示器
• 高功率 LED

• 非常适合驱动高达 40A LED
• 高达 3000:1 的 PWM 调光
• 20:1 的模拟调光
• ±3% 电流调节准确度
• ±3% 电压调节准确度
• 独特的负输出降压-升压型拓扑允许将接地散热器用于 RGB LED
• 3.3V 至 36V 输入电压范围
• 具 DC LED 电流检测功能的峰值电流模式
• 开路和短路 LED 保护及故障报告功能
• 浮动 LED 驱动器允许单个电源解决方案采用三种不同的调节电流来驱动多彩色 LED 或单个 LED
• 耐热性能增强型 5mm x 6mm QFN 36 引脚封装

LT3744EUHE#PBF，封装：36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)，包装形式及数量：管装，61，工作温度：-40 to 125C，AD官网报价：5.39（100-499个）；4.41（1000+个）

LT3744EUHE#TRPBF，封装：36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)，包装形式及数量：卷带，2500，工作温度：-40 to 125C，AD官网报价：5.39（100-499个）；4.41（1000+个）

LT3744IUHE#PBF，封装：36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)，包装形式及数量：管装，61，工作温度：-40 to 125C，AD官网报价：6.72（100-499个）；5.51（1000+个）

LT3744IUHE#TRPBF，封装：36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)，包装形式及数量：卷带，2500，工作温度：-40 to 125C，AD官网报价：6.72（100-499个）；5.51（1000+个）

DC2339A：LT3744 Demo Board | Sync Buck LED Driver, 5.5V ≤ VIN ≤ 24V, Drives 3 LEDs @ up to 20A Each

Demonstration circuit 2339A is a high current synchronous step-down LED driver featuring the LT3744. The unique drive stage used on the LT3744 allows the anodes of three LEDs to be connected together for better heat sinking in both the step-down configuration and the inverting buck-boost configuration (shown in a separate demonstration circuit DC1930A). The pros and cons of each configuration can be found in the data sheet.

The DC2339A targets high power LEDs and laser diodes (not included).The 3 LEDs are driven from the same output, but each LED is individually controlled. The input voltage range is 5.5V to 30V.

DC1930A：LT3744 Demo Board | Inverting Buck-Boost LED Driver, 3.3V ≤ VIN ≤ 30V, Drives 3 LEDs @ up to 12A

Demonstration circuit 1930A is a high current synchronous inverting buck-boost LED driver featuring the LT3744. The unique drive stage used on the LT3744 allows the anodes of three LEDs to be connected together for better heat sinking in both the inverting buck-boost configuration (LED anodes at ground) and the step-down configuration (shown in a separate demonstration circuit DC2339A). The pros and cons of each configuration can be found in the data sheet.

The DC1930A targets high power LEDs and laser diodes (not included).The 3 LEDs are driven from the same output, but each LED is individually controlled. The input voltage range is 3.3V to 30V; however to maintain 12A current regulation, a minimum of 7V must be applied.