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Thank you for contacting TI China E2E forum and choosing our products as part of your solution. Because of the integrated body diode in the MOSFET, current flow through the body diode from VOUT to VIN if VOUT to exceed VIN. Please read the follow chapter as below. 9.2.2.2 Output Capacitor (CL) (Optional) www.ti.com/.../tps22918.pdf
As to how much current of this IC can be sustained, Unfortunately, we do not have any specs for this parameter, because it is not normal operation. Thanks.
