TPS3899-Q1: Schematic ON/OFF section Review

hitesh soramiya

Part Number: TPS3899-Q1
Other Parts Discussed in Thread: TPS3899

Hello,

Earlier we are using LTC2954CTS8-1#TRMPBF, Now we are planning to replace with TPS3899DL01DSERQ1.

Could you please review the connection of power ON/OFF control IC TPS3899DL01DSERQ1.

We are controlling Buck/Boost IC using push button IC.

+VSYS voltage range- 3v-4.2v

Please let us know your opinion regarding TPS3899DL01DSERQ1 can replace on above schematic.?

0 Trailokya Rai 9 months ago

Hi Hitesh

This schematic looks good.

I belive you want to pull down the En after around 600 ms when the button is pressed and pull up the EN after 6.2 sec when the switch is released.

Regards

Trailokya

0 hitesh soramiya 9 months ago

Hello Trailokya

After short button press EN need to continues high because buck/boost required EN high for enable state.

0 Trailokya Rai 9 months ago in reply to hitesh soramiya

Thanks Hitesh ,

EN will go low in this case as you pull down the sense pin .

Regards

Trailokya

0 hitesh soramiya 9 months ago in reply to Trailokya Rai

That means we can not operate buck/boost using this IC correct?

0 Trailokya Rai 9 months ago in reply to hitesh soramiya

Hitesh

That is correct. RESET of TPS3899 will be latched to the switch.

TPS3422 is not latched to the swich and will start the buck.

Regards

Trailokya

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