Q: TPS72015 turn on VIN/VBIAS sequence by 741196

 

 a question regarding tps72015  :

We have IN = 1.8V and BIAS = 3.3V

We can’t guarantee the power sequence on turn on and shutdown - do we need any protection ?

http://focus.ti.com/lit/ds/symlink/tps72015.pdf

 

 

Amit Benjamin,
Analog & Embedded Processing
Field Application Engineer,
Texas Instruments, Israel,
Cell     +972 54 6663791

 

 

The only comment I found in the DS says that Vin shouldn't exceed Vbias.


A: Re: Motorola - TPS72015 turn on VIN/VBIAS sequence by 10449

You must ensure that the voltage on the TPS72015 IN pin never goes higher than the voltage on the BIAS pin. I suggest connecting a schottky diode between IN and BIAS with the anode connected to IN.  This prevents IN from going higher than BIAS at both turn on and turn off.