LMR14050-Q1: Schematic check

Mostafa Shuva

Intellectual 1930 points

Part Number: LMR14050-Q1
Other Parts Discussed in Thread: TPS563249, TPS566235, TPS62827, LMR14050, LMR14020

Hello,

Can you please check the below schematic for my design? I would like to ensure it will work for my application. Thanks!

Requirements:

Input Voltage: 5 V

Output Voltage: 1.1 V

Output Voltage Ripple: 25 mVpp

over 5 years ago

0 Andy Chen over 5 years ago

TI__Mastermind 27775 points

Hi Mostafa,

What's input voltage range? what's load current?

TPS563249, TPS566235 and TPS62827 maybe better choice if Vin below 6V.

0 Mostafa Shuva over 5 years ago in reply to Andy Chen

TI__Intellectual 1930 points

Hi Andy,

Input voltage could go up 12 V in some cases, however for this particular variant of the design we are using 5 V input. Load current is approximately 4 A.

The reason this part was chose is because we have another design utilizing 2x LMR14020 devices, but due to board constrains on this design we needed to find something that was pin-to-pin compatible, and the LMR14050 fit perfectly. Also, this is an automotive application.

0 Andy Chen over 5 years ago in reply to Mostafa Shuva

TI__Mastermind 27775 points

Hi Mostafa,

I recommend below changes:

1. L53=1uH

2. R67=3.3 ohm

3. move C169 22uF to output

4. C172 and C176 are NOT populated

5. C168, 170, 171 should be rated 16V or higher

0 Mostafa Shuva over 5 years ago in reply to Andy Chen

TI__Intellectual 1930 points

Hi Andy,

Thank you for your feedback. Just for my reference, can you provide some context on these recommendations? I don't have much power design experience, so this would be helpful for me in the future.

Power management

Power management forum

LMR14050-Q1: Schematic check