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The RT4501/A is a high-efficiency LED driver for backlight applications. An asynchronous boost converter with an internal Schottky diode and a current source driver are designed to support 6LED/channel with wide input voltage range from 2.5V to 5.5V. <p align="justify">An I<sup>2</sup>C interface can provide easy backlight control in fast and high speed mode. The RT4501 supports linear mappings with 256 steps to setup the brightness of backlight LEDs. It also supports PWM dimming to adjust the brightness. </p><p align="justify">For brightness dimming, the RT4501A supports 128 steps pulse dimming which determines the LED current, and RT4501 support 256 steps PWM dimming which determines the LED current. </p><p align="justify">The RT4501/A provides complete protection functions such as input under-voltage lockout, over-current, output over-voltage and over-temperature protection. The OVP threshold voltage can be set at 16V and 25.5V for different applications. The RT4501/A is available in the <br />WL-CSP-10B 0.87x2.07 (BSC) package.</p>
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  • 输入电压范围：2.5V~5.5V
  • 集成了肖特基二极管
  • 兼容快速模式的 I2C 接口
  • 驱动多达7只串联的2串 WLED
  • 外部 PWM 或脉冲亮度控制方式
  • 550kHz/1MHz 开关工作频率
  • 内建软启动功能
  • PWM 调光/脉冲调光的精细度可达256/128级
  • I2C 可编程的256级线性电流调节
  • 使用小型电感，效率可达85%
  • 16V/25V可编程过压保护
  • 电流精度：±5%；电流平衡：±3%
  • 欠压锁定、过压保护、过流保护和过热保护
  • 关机电流：<1µA
  • 使用温度范围：-40°C~85°C
  • 符合 RoHS 规范，不含卤素
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移动电话 数码相机 PDA 和智能手机 便携式设备
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