TPS61221

Embionics Technololgy

Prodigy 190 points

Other Parts Discussed in Thread: TPS61221, TLV62565

We are using TPS61221 LDO. Is it possible to get Vout=3.3V when Vin=5V with TPS61221 IC?

What happen if the input voltage is higher than the output voltage?

over 11 years ago

0 Jasper Li over 11 years ago

TI__Mastermind 46905 points

TPS61221 is a boost converter, the input voltage should be lower than Vout.

if the Vin is always higher than Vout in your application, you should use a buck converter, like TLV62565, or LDO if you output current is small. thanks

jasper li

0 Embionics Technololgy over 11 years ago in reply to Jasper Li

Prodigy 190 points

Thanks for the reply!

But the datasheet of TPS61221 says input voltage range is 0.7V to 5.5V with fixed output voltage 3.3V typical & 3.4V maximum. So it's not 100% clear about boost converter topology. And we observed when input voltage is 4V output is 3.3V.

So is there mistake in the datasheet?

0 Jasper Li over 11 years ago in reply to Embionics Technololgy

TI__Mastermind 46905 points

find this link for detail about your question

http://e2e.ti.com/support/power_management/non-isolated_dcdc/w/design_notes/1179.tps61220-performance-with-vin-near-vout.aspx

thanks

jasper li

Power management

Power management forum

TPS61221