Part Number: TPS25946
Other Parts Discussed in Thread: TPS25947
Tool/software:
Hi TI Team,
I’m currently using the TPS25946 to implement a backup battery switching function.
Please see my schematic below:
In the circuit:
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The upper section uses BAT_IN as the main battery.
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The lower section uses BACKUP_BAT as the backup battery.
My requirement is that when the main battery is present and supplying power to the load (BAT_VCC), the eFuse connected to the backup battery must be disabled to prevent it from supplying power.
To achieve this, I’m using the PG (Power Good) feature:
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When the main battery is present, the PGTH voltage of the upper TPS25946 exceeds the threshold, causing PG to go high.
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This PG high signal pulls the EN/UVLO pin of the lower TPS25946 low, thus disabling the backup battery output.
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When the main battery is removed and PGTH falls below the threshold, PG goes low, allowing the EN/UVLO of the lower TPS25946 to go high, enabling the backup battery to supply power to the system.
Could you please confirm if this design approach is valid and recommended for this kind of application?
Thank you.
