BQ24072: Vo(reg)

tateo yamashiro

Guru 10890 points

Part Number: BQ24072

Hi,

We got a question from customer about bq24072.
Could you help us?

[Question]
According to datasheet, Vo(reg) is Vbat+225mV at Vbat>3.2V. How does the Vo(reg) be regulated to Vbat+225mV?

Best Regards,
tateo

over 8 years ago

0 tateo yamashiro over 8 years ago

Guru 10890 points

Sorry for the rush, but could you give us your feedback by this coming Tuesday?

0 Bill Johns over 8 years ago in reply to tateo yamashiro

TI__Guru* 75886 points

The bq24072 System Output will track battery voltage.
For battery voltage above 3.2V OUT voltage will be Vbat + 225mV.
For battery voltage below 3.2V OUT voltage will be a fixed 3.4V.
Also see data sheet figure 4 and section 9.3.4.1.

0 Jing Zou over 8 years ago in reply to tateo yamashiro

TI__Mastermind 20570 points

What is the concern from the customer? In other words, what is the reason customer ask this?

Basically Vout regulation loop is based on an internal reference that is 225mV above the battery voltage.

0 tateo yamashiro over 8 years ago in reply to Jing Zou

Guru 10890 points

Thank you for your reply.
They consider to use bq24072. When the device will be DIN phase, they should have internal design review.
So they need this information.

Best Regards,
tateo

0 user4928033 over 8 years ago in reply to Bill Johns

Prodigy 10 points

So for Vbat = 3.7V Vo=3.925V
On page 4 of the datasheet Vbat(reg) = 4.2V Vo(reg) = 4.2+0.225=4.425V ----- Is this the maximum Vo when the battery is fully charged ?

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BQ24072: Vo(reg)