Can LTC3897 VBIAS and EXTVcc be tied together?

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Accepted Answer

While it is possible to tie the VBIAS and EXTVcc pins together on the LTC3897, there are important considerations to keep in mind. EXTVcc should not be connected to a voltage higher than VBIAS. VBIAS can handle up to 76V, whereas EXTVcc is rated for 14V. 
 Connecting them together defeats the purpose of EXTVcc as a backup, making switchover between the two impossible. The primary advantage of EXTVcc is that it allows DRVcc power to be supplied from a high-efficiency external source, thereby reducing the power dissipation of the VBIAS LDO.

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LTC3897: FAQ