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麻烦给推荐一款合适的PWM恒流源芯片

Other Parts Discussed in Thread: TPS61088, TPS62130A

应用是这样的:单片机通过PWM信号控制恒流源芯片,可以调节占空比,来实现电流变化。占空比最好是0-100。LED的工作电压电流是:电流为3A时电压4.5V,电流为2.5A时,电压4V。前端供电是18650锂电池,通过TPS61088升压到6V3A,输出18W,接到恒流源芯片上。要求恒流源芯片为降压型,输出电流最大可以到3A或者4A。谢谢