STPMIC1 BSTOUT Continous output current

[SB_arrive]

Hello,

In the STPMIC datasheet, the BSTOUT continous current  is specified as being greater than 1.1 A when 3.3 V < VIn < 5.5 V.
If the voltage Vin is greater than 4.5 V, does the  BSTOUT continous current  increase?

I assume so, since the inductor's peak current limit (IBSTLIM) is 3.3 A and the short-circuit current (IBSTSH) is 4 A, but could you confirm this for me?

If so, what is the BSTOUT continous current  when Vin>4.5 V?

Best Regards.

Sylvain

[Peter BENSCH · Accepted solution]

Welcome @SB_arrive, to the community!

No - a higher continuous BSTOUT current cannot be assumed just because VIN > 4.5V.

• IBSTOUT_HI with min 1.1A is the specified continuous current under the stated conditions.
• IBSTLIM (3.3A) and IBSTSH (4A) are peak/protection limits, not continuous operating ratings.

There is no separate rating or curve for higher VIN in the data sheet, so the continuous BSTOUT current is still only guaranteed as min 1.1A. To take worst-case conditions into account, therefore, a higher current should not be assumed either.

Hope that answers your question?

Regards
/Peter