Voltage at V33 when Vbat1 is less than 3.3V

⚠️
Hi there.. thanks for coming to the forums. Exciting news! we’re now in the process of moving to our new forum platform that will offer better functionality and is contained within the main Dialog website. All posts and accounts have been migrated. We’re now accepting traffic on the new forum only - please POST any new threads at//www.xmece.com/support. We’ll be fixing bugs / optimising the searching and tagging over the coming days.

2 posts / 0 new

Last post

Fri, 2017-04-28 06:57

itsikb

Offline

Last seen:1 year 2 months ago

加入:2017-03-23 14:25

Voltage at V33 when Vbat1 is less than 3.3V

Hi,
From Figure 9: Power management unit block diagram, it looks like the V33 source is LDO.
What will be the voltage at V33 pin when the battery voltage at Vbat1 is less than 3.3V?
If, for example, the battery is non rechargeable lithium battery, the voltage of the battery can drop below 3.3V.
It looks like the Vbat1 is suitable only for rechargeable lithium battery (3.4-4.2V).
What is the dropout voltage of the 3.3 LDO's?

Thanks,

Itsik

Device:

DA1468x

Fri, 2017-04-28 17:05

MT_dialog

Offline

Last seen:3 months 5 days ago

加入:2015-06-08 11:34

Hi itsikb,

如果你提供低于3.3 v your output will be about the voltage that you provide to the VBAT1 -100mV to -150mV. This is the drop voltage of the LDO's.

Thanks MT_dialog