ALD810019SCL

The output current (I OUT) for the ALD810019/ALD910019 SAB MOSFETs changes significantly in response to a 100mV increase or decrease in input voltage. When V IN = 1.90V is applied, I OUT is 1µA. With a 100mV increase in V IN to 2.00V, I OUT increases by about tenfold. Further increasing V IN to 2.12V for the ALD910019 (2.14V for the ALD810019) results in I OUT increasing one hundredfold, to 100 µA. Conversely, a 100mV decrease in V IN to 1.80V leads to I OUT decreasing to one tenth of its previous value, to 0.1 µA. Another 100mV decrease in input voltage would reduce I OUT to 0.01 µA. Therefore, the output current varies exponentially with the input voltage for the ALD810019/ALD910019 SAB MOSFETs.

The precision gate threshold voltage of the SAB MOSFETs varies with input voltage. When the gate-drain source terminals are connected together at a drain-source current of 1µA, the gate threshold voltage in the Vt mode is 1.90V . For example, when an input voltage of 1.90V is applied to an ALD810019/ALD910019, the output current is 1µA . Therefore, the precision gate threshold voltage of the SAB MOSFETs varies with input voltage, affecting the output current and acting as an effective variable resistor that balances supercapacitors connected in series within their voltage and current limits

The purpose of the ALD810019/ALD9100 SAB MOSFETs is to balance supercapacitors connected in series by providing precise operating voltage and current characteristics for each device. These MOSFETs help prevent over-voltages by controlling excessive voltage rise across the supercapacitors in a series-connected stack. They achieve automatic supercapacitor balancing by exhibiting complementary opposing current levels, resulting in minimal additional leakage currents beyond those caused by the supercapacitors themselves.