TPS61099: Input voltage range 3 - 4.2 V

Hi Vladimir:

Please allow me double check with you firstly.

The input/output information is different between your post and the document attached. So what's the input rang, Vout, and load condition?

Dear Minqiu, thank you

1)  I made calculation using WBdesign for TPS610995 for Vin = 1.75 - 2.4 V,  Vout= 3.6V, Iout= 20 mA (for 1-cell lead acid battery), please see attach.

2) I also need power supply for  Vin = 3 - 4.2 V, Vout= 3.6V, Iout= 20 mA.

Please, answer, can I use the the same circuit (in my attach) for   Vin = 3 - 4.2 V ?

TIA

Sincerely,

Vladimir Naumenkov

www.agat.by

Hi Vladimir:

OK, so you have two project same time...No wonder it confused me.

1. OK, the calculation looks well. 

2. If the Vin>Vout, the TPS61099 will enter into down mode and passthrough mode. In down mode, the Vout could be regulate still as 3.6V. But in pass-through mode, it can't regulate Vout anymore.

So it's depends on what you expect when Vin>Vout.

Dear Minqiu, thank you

Sincerely,

Vladimir Naumenkov

www.agat.by