TPS61236P: I'm trying to use an LDO voltage instead of a battery as the input voltage.

Muhammad Razlan Dhamir Hamdan

Part Number: TPS61236P

Dear TI team,

I have a question if TPS61236P would be possible for me to achieve my goal.

I have an LDO voltage which would be an input voltage (3.3V, 80mA) and I want to boost it to get an output voltage of 5V, and, with an output current of 3A if possible.

1. So, would TPS61236P be able to receive that LDO voltage as the input voltage instead of receiving from a battery?

2. Would TPS61236P be able to produce an output current of 3A with the mentioned LDO voltage (3.3V, 80mA), as I saw in the datasheet that it has the CC operation after CV operation?

FYI, my load would actually be a battery charge management IC.

Please do correct me if there is any of my understanding that might be wrong.

Thank you!

over 4 years ago

0 Zack Liu over 4 years ago

TI__Mastermind 34201 points

Hi Muhammad,

According your description, the TPS61236P output is 5V 3A. So assume the efficiency is 90%, the average input current would be 5V*3A/3.3/0.9=5.05A. Does the LDO has this current capability because you said this is a 3.3V, 80mA LDO.

0 Muhammad Razlan Dhamir Hamdan over 4 years ago in reply to Zack Liu

Prodigy 30 points

No, the LDO doesn't have that output capability.

I guess I will need to have an op-amp first to amplify the LDO current to around 5.05A (according to the efficiency) before going to the TPS61236P.

Do you have a component suggestion for the op-amp, or even any others?

0 Zack Liu over 4 years ago in reply to Muhammad Razlan Dhamir Hamdan

TI__Mastermind 34201 points

Hi Muhammad,

Correct. The power supply of TPS61236P should have that current capability and has some margin.

Sorry I only support TI boost converter products. You can post a new thread on E2E to get help from op-amp experts.

0 Muhammad Razlan Dhamir Hamdan over 4 years ago in reply to Zack Liu

Prodigy 30 points

Hi Zack,

Thank you so much for your responses, really appreciate that. I will post another new thread on that part.

Thanks again!

Power management

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TPS61236P: I'm trying to use an LDO voltage instead of a battery as the input voltage.