TPS61178: TPS61178 / TPS611781 load disconnect

Niclas Arndt

Intellectual 425 points

Part Number: TPS61178

Hello,

If the external P-FET controlled by DISDRV is excluded, what is the behaviour of the TPS61178 / TPS611781?

Doesn't the internal N-FET at the VOUT pin stop conducting when the controller EN pin is low (shutdown)?

Best regards

Niclas

over 2 years ago

+1 Bryce Xun over 2 years ago

TI__Mastermind 22770 points

Hi Niclas,

The external P-FET is added to completely disconnect the output from the input end during shutdown or output short happens. Removal of external P-FET doesn't affect the normal operation of the TPS61178/TPS611781.

When EN pin is low, there is no switching but there is leakage current from Vin to Vout through the body diode of internal high-side N-FET.

Best Regards,

Bryce

0 Niclas Arndt over 2 years ago in reply to Bryce Xun

Intellectual 425 points

Thanks!

Power management

Power management forum

TPS61178: TPS61178 / TPS611781 load disconnect