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AM437x电源管理芯片TPS65218输出相关问题

Other Parts Discussed in Thread: TPS65218

在标记为Tuesday, March 18, 2014设计的am437x_starterkit_evm_3k0009.dsn的原理图设计中,看到65218的SYS_BU只接了一个电容,跟数据手册里面描述的相符  www.ti.com.cn/.../tps65218.pdf       @Page5

但是在标记为Friday, September 26, 2014设计的am437x_gp_evm_3k0006_rev1_4a.dsn的原理图中,看到SYS_BU外接了一个LDO输出1.8VRTC电压

但是按照TPS65218内部结构图,既然CC或IN_BU已经通过内部DCDC6转成1.8V RTC了,如此外接不是多此一举?  www.ti.com.cn/.../tps65218.pdf       @Page19

我想请问这样设计的理由? 谢谢!