LM2623: LM2623 EVM doesn't work

Hugo Zhang

Part Number: LM2623

I run test on LM2623 EVM. With empty load, apply 3.3V/300mA to the input. But the EVM sinks all the current and pull the input voltage to ~0V.

Any suggestion?

0 Zack Liu over 3 years ago

Hi Hugo,

It looks like somewhere is short so input voltage is pulled to ~0V.

Is there is a new EVM? Have you used DMM to test the SW to GND resistance?

0 Hugo Zhang over 3 years ago

Hi Zack,

I have tried two new EVM. But the result is the same.

There is no HW short.

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

Hi Hugo,

Please make sure the power supply current limit is high enough. Could you share the startup waveform?

Power management forum