My MCP73X23 board went up in smoke with input under 18 volts and 12 volts
I purchased a MCP73X23-LCP evaluation board. This board charges LIFEPO4 (Life) batteries.. There are two parts to the board,the MCP73123 IC which charges a single battery and a MCP73223 IC whch charges 2 batteries. I connected a barrel connector to the MCP73223 board, positive to the vdd connector and negative to the vss connector. The transformer (wallwart) was 16 volts/1 amp. When I plugged it in, the ic (mcp73223) smoked and burnt up. I checked my connections and the wallwart is a center tap positve, the center of the barrel connector is positive and was connected to vdd. The barrel was negative and connected correctly. Even though the data sheet says that it be powered up to 18 volts, I thought my 16 volts (using a volt meter) might be too much. Then I used my bench power supply. I set the voltage to 12 volts and connected the red to vdd and black to vss on the mcp73123 side of the board. Again, the IC smoked and stopped working. I have included 2 pictures to look at, the first picture is the barrel connector to the mcp73223 side to show the way that I connected the power supply to the board. The second picture is a picture of my power supply and the voltage that I had applied to the mcp73123 side of the board. Any ideas why I had problems today?