LM25119: Schematic and Placement Review

Joshua Li

Part Number: LM25119

Hi Ti ,

I have used LM25119 to design 3.3V and 5V power supplies.

Can you assist in checking the schematic and layout placement?

Best Regards,

Joshua

Axiomtek Co., Ltd.

7 months ago

0 Joshua Li 7 months ago

Additional information: DC_IN range 9~36V

0 Mahmoud Harmouch 7 months ago in reply to Joshua Li

Hello,

I will check it mid next week.

. Regards

0 Mahmoud Harmouch 6 months ago in reply to Mahmoud Harmouch

Hello, here is my input:

1- add 10 Ohms resistor in series with R455 and R457 for loop measurement

2- Change, one per rail, of the input capacitor to 10uF. With actual 3x2.2uF and derating factor, the input voltage ripple is above 1V

Use this formula

3- Component placement looks OK but make sure to minimize the current loop by increasing the vias from bottom layer to L7-GND

Regards

Power management forum