Hi,
I am using MP2617 with SYSFB resistor divider (R4 = 10kΩ, R5 = 3.9kΩ) to program VSYS = ~4.1V
Observed behavior:
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VIN = 5V (adapter only, no battery connected)
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VBATT = 0V (no battery)
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VSYS measured = 3.5V
Question:
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Does MP2617 ignore SYSFB programming and fall back to minimum 3.6V regulation when VBATT < 3.4V, even if SYSFB pin is connected (not floating)?
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Is a battery required for SYSFB-programmed VSYS to work correctly?