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【求教】如何用TI芯片设计个最具成本优势的锂电池充电器?

Other Parts Discussed in Thread: BQ21040, PMP40228, UCC28704

我想做一个玩具用充电器:

1、现状都是需要一个PWM 控制器加充电IC来实现充电的吗?充1200mah左右锂电池用什么型号搭配最具成本优势?

2、有没有什么方案是可以不使用DIP引脚元件的?(尽量使用SMT的元件,这样就不需要用到波峰焊设备来实装电路板了)