BD71631QWZ is a charger IC for small batteries. The charge current rate can be set from 1 mA to 300 mA by external resistors. The BD71631QWZ comes in a very small package: 1.8 mm x 2.4 mm and 0.4 mm pitch. To speed up the evaluation of this part, ROHM offers a small, thin, and low-power evaluation board. The evaluation board is equipped with a rechargeable battery, a low current consumption Buck DC/DC converter with an operating current of 180 nA, a low-power reset IC with an operating current of 270 nA, and the charging IC BD71631QWZ.