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BQ25504: Boost swtich frequency

Part Number: BQ25504

 太阳能充电芯片BQ25504,规格书描述Boost swtich frequency 最大是1MHz  

   芯片工作时是通过PFM 模式调节输出电压。

   问下: 

   1、芯片内部是怎么控制boost工作频率?

   2、我们设定VBAT_OV=4.5V,目前的工作频率是多少?

   3、是否可以设置最小最大工作频率?怎么设定?