TPS61161A: Use TPS61161A as a LCD backlight driver, with 2 LEDs in series

Can you please help me to check what is the max current with our usage, the detailed digit as below listed.

input voltage range = 3.2V-4.2V, Li-ion battery supplied voltage

output voltage range = 5~7V, 2 series LED, with 3.0V nominal voltage each.

I use a quick assumption as below, not sure if I miss anything?

~140mA (=vin*TPS61161A_MOS_current_limit*ripple_factor/Vout =3*0.56*0.5/6)

Thanks!

Best,

Patrick