I need a voltage 3.5V from cy8c3866.I use DA generated 3.5V, and with a follower to output the voltage. Output voltage is 3.5V when no any load，and voltage will down to 2.7V when drive a resistance 1.8K. The problem is, why follower cann't drive a 1.8K resistance?How much the max current and internal resistance of follower? Thank you.
I repeated this scheme for CY8CKIT - 030
VDD =4.3V Vout_1 at P3.7
for R_1=NO Vout_1 = 3.51
for R_1=1.8K Vout_1 = 3.50
for R_1= 100 Vout_1 = 3.41
IOUT>= 16mA (see datasheet for Opamp)