Use LT3010 to power LTC4020 INT_Vcc


I see in the datasheet that the LT3010 is used to power INT_vcc. May I ask whether the GND of LT3010 is connected to SGND or PGND


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    •  Analog Employees 
    on Oct 21, 2020 4:28 PM 1 month ago in reply to BI1IZF

    Following is more explanation on FBG and DC2044A schematic.

    For CC/CV mode a powerpath FET is used to disconnect the battery after timeout.  The voltage divider connected from the battery is returned to FBG.  After timeout FBG is disconnected from ground (internal to LTC4020), so the voltage divider does not drain current from the battery.  This is why the DC2044A uses the FBG connection instead of SGND for the voltage divider.

    For Lead-Acid mode no powerpath FET is necessary because the charger operates continuously (trickle charge).  It is OK to use SGND for the voltage divider return, because the charger operates continuously.

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