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OPA548: How to use OPA548 to bulit a sink power supply?

Part Number: OPA548

Hi, I'm from China, I Posted this question on deyisupport.com, but  I 'm not sure would this circuit is right or wrong ?I try to ask this question in E2E.

datasheet page 18  show's  9.2.3

I don't know how to bulit a sink power supply ,if Vout  range is 2.7V~4.2V,because I need to simulate a battery ,it need to be charge and discharge .

thanks,my English is poor.

please help me to chek this circuit, Is that right to built a sink power supply?