Regulators

M liu

Other Parts Discussed in Thread: TPS63036, TPS55288

in the product we are developing, which uses a Lithion battery single cell (2.8v to 4/35V) as power source, we are using two regulators:

- TPS630250RNCT for 3.3V regulator, load is about 3Amp

- TPS61230ARNST for 5.5V output, load is about 1-2Amp. The max input is 4.5V, is this a concern for the battery cell input ?

Because we also charge the battery in the device in a charger, we are seeing some voltage spike transient when plugging the device into a charger. The ambient temperature in the enclosure is -5 to 85C.

Wanted to know:

- The voltage spikes/transient: if this can potential damage the device ?

- With the temperature as I described above, will this be any concern for the TI regulators operation ?

over 4 years ago

0 Minqiu Xie over 4 years ago

TI__Mastermind 21565 points

Hi M:

The Vin is from 2.8V to 4.35V right?

I afraid if TPS63025 can support 3A. Can you separate the loading into 1.5A*2 or 2A+1A?

0 M liu over 4 years ago in reply to Minqiu Xie

Intellectual 320 points

Hi,

Wanted to know:

- The voltage spikes/transient: if this can potential damage the device ?

- With the temperature as I described above, will this be any concern for the TI regulators operation ?

0 Minqiu Xie over 4 years ago in reply to M liu

TI__Mastermind 21565 points

Hi M:

The main risk is the single TPS63036 can't supply 3A load . You can choose TPS55288 for such loading, or other controller with external FET.

For voltage spikes you concerned, please ensure all spike within the Absolute Maximum Rating spec.

0 M liu over 4 years ago in reply to Minqiu Xie

Intellectual 320 points

for 3.3V, we are using : TPS630250RNCT for 3.3V regulator, load is about 3Amp.

It's NOT TPS63036.

Can you confirm: TPS630250RNCT for 3amp load at 3v3 ?

Thanks,

0 Minqiu Xie over 4 years ago in reply to M liu

TI__Mastermind 21565 points

Hi M:

Sorry for slip of the pen.

TPS63025 has the risk to supply 3.3V/3A especially Vin=2.8V

0 M liu over 4 years ago in reply to Minqiu Xie

Intellectual 320 points

how about 2 amp load ?

0 Minqiu Xie over 4 years ago in reply to M liu

TI__Mastermind 21565 points

Hi M:

2A loading is more reliable. You can check the Fig 5 in datasheet for reference.

0 M liu over 4 years ago in reply to Minqiu Xie

Intellectual 320 points

we are also using a step-up 5.5V regulator: TPS61230ARNSR. The battery input will be 2.5-4.4(max). We use this to generate a 5.5V for LCD, peripherals, and a motor. The expected load current is about 2Amp peak, will this regulator work ? thanks

0 Minqiu Xie over 4 years ago in reply to M liu

TI__Mastermind 21565 points

Hi M:

It's out side the corner. Iin=Vo*Io/Vin/Eff = 5.5*2/2.5/0.9=4.36. It's larger than the current limit even no considering the current ripple.

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