TPS76333

Gyorgy Sagi

I have 3 TPS76333 ,and on the outputs i measure 3,8 V not 3,3? is it ok? how could this happen? or am i doing something wrong??? what should I do to have 3,3V not 3,8?

thank you!

over 14 years ago

0 Jeff F over 14 years ago

TI__Guru**** 166176 points

Does the output voltage regulate to 3.8V regardless of input voltage and load current (up to 150mA). Did you check the package top marking to make sure you have the correct ICs? 3.3V option should read PBEI. 3.8V option reads PBFI. If that is not the problem, can you provide a schematic and input voltage?

0 Bill Stokes over 14 years ago

TI__Expert 8890 points

Hello Gyorgy,

No this is not ok. Have you looked at the output on an oscilloscope to see if the output is oscillating. Please make sure that the output capacitor meets the requirements found in the Apps Info (and Figures 16-19) of t he data sheet.

Bill

0 Gyorgy Sagi over 14 years ago in reply to Jeff F

Prodigy 30 points

This marking is on the top of SOT23 package? Because I read BA0 on the top. I use the schematic that is in the datasheet, from my computer's usb voltage.

0 Jeff F over 14 years ago in reply to Gyorgy Sagi

TI__Guru**** 166176 points

The marking should have four letters starting with P. If not, then you may not have the correct IC.

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TPS76333