TPS61089: TPS61089 performance of variable Input voltage

Rahul Surawase48

Part Number: TPS61089
Other Parts Discussed in Thread: BQ25895, TPS61088, INA253

Hello TI,
We are using TPS61089 Boost converter to Avoid Switch over time of charging IC of BQ25895
BQ25895 takes Switch over time more than 30mSec as per thread

we looking to avoid load reset(Raspberry PI) for this we plan to use TPS61089 Boost converter we have few question related TPS61089

1.there is any Buck to boost and vise versa conversion time require to TPS61089
2.If there is any voltage variation on Input side of TPS61089 require time of (FB to Vout) to set regulated output voltage
3.we require constant Output voltage is it possible and If yes then How ..?
4.TPS61089 can handle 5A Load ..? what we need to to design precaution ..?

Thanks for your valuable support and availability to resolve the query

Thanks & Regards,

Rahul Surawase

over 6 years ago

0 Helen chen over 6 years ago

TI__Mastermind 40080 points

Dear Sir,

What is your Vin range and the Vo, Iomax in your application? Or we can't judge whether TPS61089 is fit or not!

0 Rahul Surawase48 over 6 years ago in reply to Helen chen

Expert 2395 points

Hello Helen,

as mention above point 4- Iout(max) = 5A to drive Raspberry Pi 4 and other circuit

In case of Input supply OFF BQ25895 suddenly reduce the system output voltage to 3.7 for 38mSec and again power on the system Output Voltage by Battery Power (Adptor to battery switch over time is 38mSec), because of that 38mSec time is sufficient to reset Raspberry Pi 4 we need avoid this, that's why we plan to use boost converter between the charging IC (BQ25895) and Load (Raspberry Pi4)

1.Vin Input voltage range is 3.7 to 4.8V(max-5V)
2.Vo Output voltage range is 5V
3.Iomax Output current range is 5A

Boost converter(TPS61089) accept the Sudden change On Input side (4.8 to 3.7 for 38mSec and again 4.8V) in that rear case's can provide constant Output voltage..?

Thanks,

Rahul surawase

0 Helen chen over 6 years ago in reply to Rahul Surawase48

TI__Mastermind 40080 points

Dear Sir,

TPS61089 can't support 5V/5A, you should use TPS61088 instead of TPS61089.

0 Rahul Surawase48 over 6 years ago in reply to Helen chen

Expert 2395 points

Hello Helen,

we saw the TPS61089 is support adjustable switch current up to 10A ....?

Can you pleas explain the thing to select correct Boost converter

Thanks,

Rahul Surawase

0 Rahul Surawase48 over 6 years ago in reply to Rahul Surawase48

Expert 2395 points

Hello Helen,

There is difference between TPS61089 and TPS61088 is Continuous output Power 18W and 30W there is anything else then this ..?

Thank you for suggesting TPS61088, can you please clear mention point also to finalize the IC

Boost converter(TPS61088) accept the Sudden change On Input side (4.8 to 3.7 for 38mSec and again 4.8V) in that rear case's can provide constant Output voltage continuously ..?

0 Helen chen over 6 years ago in reply to Rahul Surawase48

TI__Mastermind 40080 points

Dear Sir,

10A means the peak switch current, not the load current.

0 Helen chen over 6 years ago in reply to Rahul Surawase48

TI__Mastermind 40080 points

Dear Sir,

Yes, TPS61088 is just fit for the application.

0 Rahul Surawase48 over 6 years ago in reply to Helen chen

Expert 2395 points

Hello Helen,

If there is change in Input of TPS61088 require any output stable time..If Yes, How much time its takes to stable the Output voltage ..?

TPS61088 power delivering 30W, as per Output power Delivering can we get 5V/6A ....?

Thanks,

Rahul Surawase

0 Helen chen over 6 years ago in reply to Rahul Surawase48

TI__Mastermind 40080 points

Hi Sir,

For TPS61088, 5V/6A is a little bit too much, but it depend on the Vin_min, if the Vin_min no less than 3.8-3.9V, then it is OK.

When Vin changes, this is line transient, the Vout will change. But the change will not be too much if you add enough output caps.

0 Rahul Surawase48 over 6 years ago in reply to Helen chen

Expert 2395 points

Hello Helen,

Minimum Vin is 3.7V of the TPS61088, It is Ohk to get 5V/5A Output...?
For to get 5V/5A can help to components selection of driving circuit, try to provide reference design diagram of the system..

we already refer the TPS61088EVM for the schematic design, we need exact components reference

Thanks,

Rahul Surawase

0 Helen chen over 6 years ago in reply to Rahul Surawase48

TI__Mastermind 40080 points

Dear Sir,

Yes, TPS61088 can provide 5V/5A at Vin=3.7V.

0 Rahul Surawase48 over 6 years ago in reply to Rahul Surawase48

Expert 2395 points

Hello TI,

we want measure the Output current(Load Current) of TPS61088 to adjust BQ25895 battery charging current, there is any suggestion how to figure out this ...?

We found INA253 current sense amplifier, it is suitable to my application or any other alternatives ..?

1.Need to measure the Output current(Load current consumption) of TPS61088

2.TPS61088 output rating is 5V/5A, current able to handle the voltage and current

3.Current sensor output is provided to Host controller of the system

Try to suggest any alternative of DC current sensor to the system as per above mention points, thanks for your valuable support

Thanks and Regards,

Rahul Surawase

0 Helen chen over 6 years ago in reply to Rahul Surawase48

TI__Mastermind 40080 points

Dear Sir,

you can use INA253, or you can also refer to the current sampling method from TI design PMP9806.

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TPS61089: TPS61089 performance of variable Input voltage