I am using LTC4071 to charge LiPo (3.7 1200ma) from Solar Panel. I have a custom made PCB for this. The connection on PCB is as follows:
NTCBAIS - Floating
NTC - connected to VCC
ADJ - Floating
LBSEL - connected to VCC
BAT - connected to LiPO
Everything works good if the Solar Panel is connected and is supplying the necessary power to charge the LiPO. I can see VCC to reach the programmed float voltage of 4.1V (ADJ pin float). But in order to simulate the absence of sun light I removed the solar panel from the board. As per datasheet it should supply voltage from LiPo (at least 3.7V of LiPo). But as soon as I remove the solar panel the VCC is drooping to 0V.
My question is why VCC is drooping to 0V?, it should supply system load either from Solar Panel or LiPo.
I hope my understanding is correct.
Let me know if you need additional information.