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BQ34Z100-G1: Reg In by external regulator

Sam Evans
Prodigy 150 points
Part Number: BQ34Z100-G1

The datasheet walks through how to create your own little LDO for the REG IN pin (which can take between 2.7-4.2V)...
If I have a battery powered system (5S2P, 18.5V nominal) and a 3.3V Buck regulator already in the system, is there any issue with simply using the 3.3V Buck? 

I feel this would be more power efficient than burning power across a zener diode and resistor as the datasheet and EVM show. 

  • 0
    TI__Mastermind 25955 points
    Hi Sam,

    As long as it isn't too noisy and is above the drop out of the 2.5 V internal LDO, it should work. The zener diode and resistor is shown as an example of a low cost solution.

    Please let me know how your design turns out!

    Sincerely,
    Bryan Kahler