TPS2557 Output Capacitance

Hidetoshi Matsunami

Expert 2750 points

Other Parts Discussed in Thread: TPS2557

Hello, My name is Hidetoshi Matsunami.

I would like to ask you about the limit of output capacitance for TPS2557.

What is the limit value of output capacitance?

I'm concerned this device is in danger of breaking if the value of output capacitance.

Best Regards,

Hidetoshi Matsunami

over 10 years ago

0 Darwin Fernandez over 10 years ago

TI__Mastermind 40415 points

Matsunami-san,

This is currently being looked into by the appropriate apps engineer. An answer will be posted when available.

Regards,

Darwin

0 Milo Zhu over 10 years ago in reply to Darwin Fernandez

TI__Intellectual 2795 points

Here are some good comments about the power switch OUTPUT CAP:

http://e2e.ti.com/support/power_management/power_interface/f/204/t/204104.aspx

https://e2e.ti.com/support/power_management/power_interface/int-power_interface/f/206/t/265323.aspx

Also, there also is some suggestion on datasheet page 10:

Output capacitance is not required, but placing a high-value electrolytic capacitor on the output pin is
recommended when large transient currents are expected on the output.

0 Hidetoshi Matsunami over 10 years ago in reply to Darwin Fernandez

Expert 2750 points

Hello Darwin,

Thank you for your support.

I look forward to your answer.

Best Regards,

Hidetoshi Matsunami.

0 Hidetoshi Matsunami over 10 years ago in reply to Milo Zhu

Expert 2750 points

Hello Milo Zhu,

Thank you for your response.

I will use your response as reference.

Best Regards,

Hidetoshi Matsunami.

0 Hidetoshi Matsunami over 10 years ago in reply to Darwin Fernandez

Expert 2750 points

Hello, Darwin.

I’m sorry to be pressing.

Any update on this issue?

Best Regards,

Hidetoshi Matsunami

0 Darwin Fernandez over 10 years ago in reply to Hidetoshi Matsunami

TI__Mastermind 40415 points

Matsunami-san,

As Milo stated, there is no output capacitance requirements for this device. I recommend ordering a TPS2557 EVM and evaluating its performance in your system. The EVM uses 150uF of output cap but it can be switched out to your desired requirements.

Regards,

Darwin

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TPS2557 Output Capacitance