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RT4503/RT4503A

可驱动10只LED的异步 Boost 转换器

RT4503/RT4503A
New

RT4503/A 是具备驱动10只串联 WLED 的高集成度 LED 驱动器，它包括了一个电流模式 Boost 转换器和 36V/1.2A 的功率开关。RT4503/A 可在 2.5V~5.5V 的输入电压范围内以 550kHz 的工作频率工作，使用一只电阻即可设定 LED 电流，反馈电压为 200mV。调光方面，RT4503A 支持32级脉冲调光法，RT4503 则支持 PWM 调光法，它们都对反馈系统的参考电压进行调节。

应用

  • 移动电话
  • 数码相机
  • 便携式设备

主要规格

RT4503 RT4503A
Status Active Active
Vin (min) (V) 2.5 2.5
Vin (max) (V) 5.5 5.5
Vout (max) (V) 36 36
LED Channels 1 1
Topology Boost Boost
SW Freq (typ) (kHz) 550 550
Vcs (typ) (mV) 200 200
Dimming Control PWM Pulse
Features Backlight;Cycle-by-Cycle Current Limit;Enable Input;OVP;UVP Backlight;Cycle-by-Cycle Current Limit;Enable Input;OVP;UVP
Package Type WDFN2x2-6 WDFN2x2-6

关键特性

  • 输入电压范围：2.5V~5.5V

  • 36V 开路保护电压，容许驱动10只 WLED

  • 脉冲调光方式

  • 参考电压 200mV，精度 ±2%

  • 550kHz 工作频率

  • 内建软启动

  • 过热保护

  • 内部补偿

  • 电流限制

Datasheet

DS4503A-03.pdf

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