LTC3220 / LTC3220-1 是高集成度多显示屏 LED 驱动器。这些器件包括一个高效率、低噪声充电泵，用于为多达 18 个通用 LED 电流源供电。LTC3220 / LTC3220-1 只需 5 个小陶瓷电容器即可构成一个完整的 LED 电源和电流控制器。

LED 电流由一个内部精准电流基准来设定。所有通用电流源的独立调光、接通/关断、闪烁和灰度等级控制均通过 I2C 串行接口来实现。可使用 6 位线性 DAC 来独立地调节每个通用 LED 电流源的亮度电平。

LTC3220 / LTC3220-1 充电泵根据 LED 电流源两端的电压来优化效率。这些器件在 1x模式中上电，并当任一被使能的 LED 电流源开始进入压降状态时就自动切换至升压模式。压降将把这些器件转换至 1.5x 模式，随后的压降则把 LTC3220 / LTC3220-1 切换至 2x 模式。当某个数据位通过 I2C 端口进行更新时，这些器件将复位至 1x 模式。

• 采用 QVGA+ 显示屏的可视电话
• 键盘照明
• 通用/各类照明

• 具 64 级线性亮度控制能力的 18 个 20mA 通用型电流源
• 采用二线式I2C 接口来实现每个电流源的独立接通 / 关断、亮度电平、闪烁和灰度等级控制
• 低噪声多模式充电泵 (1x、1.5x、2x) 提供高达 91% 的效率
• 转换速率受限的开关操作降低了传导噪声和辐射噪声 (EMI)
• 高达 360mA 的总输出电流
• 内部电流基准
• 单个复位引脚用于实现异步停机和所有数据寄存器的复位
• 提供了两个 I2C 地址 (LTC3220：0011100，LTC3220-1：0011101)
• 自动或强制模式切换
• 内部软起动功能可限制浪涌电流
• 短路 / 热保护
• 4mm x 4mm 超薄型 (高度仅 0.55mm) 28 引脚 QFN 封装
  
  

LTC3220EPF#PBF，封装：28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)，包装形式及数量：管装，91，工作温度：-40 to 125C，AD官网报价：3.25（100-499个）；2.65（1000+个）

LTC3220EPF#TRPBF，封装：28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)，包装形式及数量：卷带，2500，工作温度：-40 to 125C，AD官网报价：3.25（100-499个）；2.65（1000+个）

LTC3220EPF-1#PBF，封装：28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)，包装形式及数量：管装，91，工作温度：-40 to 125C，AD官网报价：3.25（100-499个）；2.65（1000+个）

LTC3220EPF-1#TRPBF，封装：28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)，包装形式及数量：卷带，2500，工作温度：-40 to 125C，AD官网报价：3.25（100-499个）；2.65（1000+个）

LTC3220IPF#PBF，封装：28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)，包装形式及数量：管装，91，工作温度：-40 to 125C，AD官网报价：3.72（100-499个）；3.04（1000+个）

LTC3220IPF#TRPBF，封装：28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)，包装形式及数量：卷带，2500，工作温度：-40 to 125C，AD官网报价：3.72（100-499个）；3.04（1000+个）

LTC3220IPF-1#PBF，封装：28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)，包装形式及数量：管装，91，工作温度：-40 to 125C，AD官网报价：3.72（100-499个）；3.04（1000+个）

LTC3220IPF-1#TRPBF，封装：28-Lead UTQFN (4mm x 4mm x 0.55mm w/ EP)，包装形式及数量：卷带，2500，工作温度：-40 to 125C，AD官网报价：3.72（100-499个）；3.04（1000+个）

DC1265A-B：LTC3220EPF-1 | 360mA General Purpose LED Driver (Requires DC590)

Demonstration circuit 1265 is a 360mA (20mA per LED) Universal 18-Channel LED Driver with twelve white LEDs and two RGB LEDs featuring the LTC3220/LTC3220-1. The LTC3220/LTC3220-1 is a low noise boost charge pump designed to drive 18 universal LED (ULED) current sources. The charge pump automatically switches between 1x, 1.5x and 2x modes to provide the necessary output voltage. The demo board input supply voltage range is 2.9V to 5.5V. DC1265A-A features the LTC3220, and DC1265A-B features the LTC3220-1. The two parts have different I2C addresses, allowing both devices to be used in a system if more than 18 LED drivers are needed./p>

The DC1265 requires the DC590 controller board for proper operation. The 18 LEDs are includes on the demo board. The LTC3220/LTC3220-1 features include On/Off blinking, gradation, intensity, and a software controlled shutdown, which are accomplished via an I2C serial interface. There are 64 dimming states available for the universal LEDs.

DC1265A-A：LTC3220EPF Demo Board | 18-LED Boost Charge Pump LED Driver, 2.9V ≤ VIN ≤ 5.5V, VLED up to 5V at 20mA per LED (DC590 Requires)

Demonstration circuit 1265 is a 360mA (20mA per LED) Universal 18-Channel LED Driver with twelve white LEDs and two RGB LEDs featuring the LTC3220/LTC3220-1. The LTC3220/LTC3220-1 is a low noise boost charge pump designed to drive 18 universal LED (ULED) current sources. The charge pump automatically switches between 1x, 1.5x and 2x modes to provide the necessary output voltage. The demo board input supply voltage range is 2.9V to 5.5V. DC1265A-A features the LTC3220, and DC1265A-B features the LTC3220-1. The two parts have different I2C addresses, allowing both devices to be used in a system if more than 18 LED drivers are needed.

The DC1265 requires the DC590 controller board for proper operation. The 18 LEDs are includes on the demo board. The LTC3220/LTC3220-1 features include On/Off blinking, gradation, intensity, and a software controlled shutdown, which are accomplished via an I2C serial interface. There are 64 dimming states available for the universal LEDs.