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TPS25983: Power supply more that 26V

Part Number: TPS25983
Other Parts Discussed in Thread: TPS1663, TPS1685

Tool/software:

Hi! I will supply the TPS25983 from 24V acid lead batterie. This batterie type can have  max.voltage till 29V. How can I use this part with this batterie? Is it possible to switch 4x diods between TPS25983 GND and batterie GND (so like a negative protection with a diode) and so reduce the max voltage on TPS25983: 29-4*0.5V=27V?