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请一款可以通过pwm控制的恒流源

以往dcdc芯片都是通过外接两个分压电阻到fb引脚决定输出电压,有没有通过pwm来调整输出电压的dcdc ic,要封装好焊接的。我是想实现一个通过pwm在线调节实现恒流输出的功能,要效率高的那种,线性的恒流源不要,封装要好焊接的,希望能给个参考电路。