TPS54227: asking for TPS54227 design review

Hello 

IC1600 SCH comments:

• 1nF on BST is not enough. A 0.1-µF ceramic capacitor must be connected between the VBST to SW pin for proper operation.
• I am not sure what the purpose of L1600 and L1604
• An additional 0.1-µF capacitor from pin 8 to ground is a good practice to provide additional high frequency filtering and need to be place as close as possible to the pin.
• For the soft start, 3.8nF will give about 2.8ms start time, just make sure that what is intended
• From 22uF to 68uF Output capacitor is recommended
• VOUT is set to 3.346V using the feedback resistors.

IC1601 SCH comments:

• 1nF on BST is not enough. A 0.1-µF ceramic capacitor must be connected between the VBST to SW pin for proper operation.
• I am not sure what the purpose of L1601 and L1605
• An additional 0.1-µF capacitor from pin 8 to ground is a good practice to provide additional high frequency filtering and need to be place as close as possible to the pin.
• For the soft start, 3.8nF will give about 2.8ms start time, just make sure that what is intended
• From 22uF to 68uF Output capacitor is recommended
• VOUT is set to 3.833V using the feedback resistors.

IC1501 SCH comments:

• 1nF on BST is not enough. A 0.1-µF ceramic capacitor must be connected between the VBST to SW pin for proper operation.
• I am not sure what the purpose of L1501 and L1604
• An additional 0.1-µF capacitor from pin 8 to ground is a good practice to provide additional high frequency filtering and need to be place as close as possible to the pin.
• For the soft start, 3.8nF will give about 2.8ms start time, just make sure that what is intended
• From 22uF to 68uF Output capacitor is recommended
• VOUT is set to 1.813V using the feedback resistors.

For the layout, I could not open it, please send it to me in PDF, I will provide my comment as well.

Thanks 

Tahar

Hello, 

I tried installing the viewer, i go the attached message.