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BQ34110: Relates to bq34110 EVM Schematic

Part Number: BQ34110

I am designing the circuit for 24V Lead Acid Battery. My doubt is How Q1 MOSFET is providing 4V to pin 6(REGIN) BQ34110 IC  (Figure 17. Q1 Dropping Battery Stack Voltage to 4 V). How MOSFET is regulates the 4V exactly to the IC. Explain and give the equation for getting 4V from Q1(2N7002-7-F) MOSFET.