TPS55288: Circuit not powering up

Tyler Fontaine

Part Number: TPS55288

I used TI's WEBENCH designer and copied the supplied schematic design but I can't seem to get it to power up. Any clue to what my issue might be? Below is the WEBENCH design along with my Altium design.

WEBENCH Design:

My Design:

over 3 years ago

0 Zack Liu over 3 years ago

TI__Mastermind 34231 points

Hi Tyler,

Could you share your application Vin range, Vout, max Iout information?

0 Tyler Fontaine over 3 years ago in reply to Zack Liu

Prodigy 170 points

Hi Zack,

0 Zack Liu over 3 years ago in reply to Tyler Fontaine

TI__Mastermind 34231 points

Hi Tyler,

OK. I'll take some time to review the schematic and send you the review comments by end of this Friday.

0 Zack Liu over 3 years ago in reply to Zack Liu

TI__Mastermind 34231 points

Hi Tyler,

Please see below my comments on schematic:

1. Please TPS55288 needs I2C register setting to enable switching. If you don't have MCU in your system to configure TPS55288 internal I2C register, please consider using TPS552882. These two parts are pin 2 pin.

2. Suggest use 4.7uH inductor, the saturation current level should be higher than 10A.

3. Change R95 to 36kohm.

4. Add one 1uF ceramic capacitor at input side and put it close to Q6, Q7. Add one 1uF ceramic cap and put it close to VIN pin.

5. Add one 1uF ceramic cap close to Vout pin and GND pin.

6. It's suggested to replace C107 to 100uF cap.

7. Change R93=15kohm,C111 =4.7nF. Add another 47pF cap across COMP and GND.

0 Zack Liu over 3 years ago in reply to Zack Liu

TI__Mastermind 34231 points

Also remember to follow the layout guideline: www.ti.com/.../slvaer0b.pdf

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TPS55288: Circuit not powering up