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LTC4380 Under Voltage Lockout - Is Zener Diode required?

Category: Hardware
Product Number: LTC4380
Software Version: N/A

Figure 8 in the LTC4380 datasheet shows a Zener Diode used to set the Undervoltage lockout threshold.

Is there a reason a resistor divider cannot be used here instead? For cost saving, and limiting current wasted through this circuit.