usage of the boost converter tps61032

Karthika Ravindran

Other Parts Discussed in Thread: TPS61032, TPS61030

hi,

i have a lithium battery, with 3,6V nominal output, and can supply current pulses of upto 3A for a 1s,

Need a 5v supply, 190mA average current, 1,5A burst for 10 ms.

Would like to use a tps61032. It states that it can give upto 1A, 5v .. but later in the datasheet, the graph of max current vs input voltage shows the max current to increase with supply voltage.

Hence would this converter : tps61032 be a good choice.

They have multiple Vout pins, do i need to short all of them and use.

Or the multiple pins are used to drive multiple ics and each pin can give that much current?

over 14 years ago

0 Jeff F over 14 years ago

TI__Guru**** 165866 points

A boost converter's maximum output current varies directly with input voltage. So as Figure 2 shows, you should be able to close to 2A with an input voltage at 3.6V. However the output voltage of most batteries droops slightly when they provide large current pulses.

Yes, you need to short all of the output pins together.

0 Karthika Ravindran over 14 years ago in reply to Jeff F

Prodigy 50 points

Thank you

0 Karthika Ravindran over 14 years ago in reply to Jeff F

Prodigy 50 points

Also had another query, the specifications for the power supply were as follows :

The supply noise should be less than the limits in the following profile:

100 mVpp from 0 to 50 kHz

5 mVpp at 1 MHz measured in 50 kHz bandwidth

10 mVpp at 1 MHz measured in 1MHz bandwidth

5 mVpp above 5 MHz measured in 1 MHz bandwidth.

How can i get this information regarding the tps61032, and is there any simulation that i can perform to check the same?

Thanks in advance

0 Matthew Day over 14 years ago in reply to Karthika Ravindran

TI__Mastermind 36110 points

Unfortunately a simulation model does not exist for this IC. Noise measurements are very dependent on your board layout and component selection. It will be important that you take measurements on your specific PWB. A TPS61030 EVM is available for testing so you can evaluate performance with your specific operating conditions and with your input power source and load. You will also be able to take baseline noise measurements on the EVM. I suggest that you follow the EVM layout as closely as possible to minimize the probability of layout problems in on your PWB. The EVM gerber files are available at TI's website.