BQ25121: LS mode current capability?

Hi Juan,

Thank you for your response.

I appreciate the details regarding the LS's current capability, which depends on the input voltage and voltage tolerance. However, I need to confirm the exact current capability of the Load Switch (LS) mode for the BQ25121 IC, considering the internal MOSFET(Q5) that manages the VINLS and LS/LDO output. 

Hi Divya,

Just to clarify you want the maximum current that the device is able to provide, regardless of if output voltage drops to 0?

Best Regards,

Juan Ospina

Hi Juan,

I appreciate your support.

Please refer to the datasheet of BQ25121A(page - 28). I found two points in the datasheet:
1. If a value greater than 3.3 V is written, the setting goes to a pass-through mode where LS/LDO = VINLS - V(DROPOUT).
2. The current capability of the LDO depends on the VINLS input voltage and the programmed output voltage.

The datasheet discusses only LDO mode and does not provide information about LS mode. However, I assume LS mode also works in a pass-through mode where LS/LDO = VINLS—V(DROPOUT). 
Now, I want to know the maximum current that Q5 can handle (please refer to the 9.2 Functional Block Diagram in the datasheet) in this mode.

Hello Divya,

Our responses will be delayed due to the U.S. holidays, we will respond by the end of the week.

Sincerely,

Wyatt Keller