Semiconductor device, and method of diagnosing abnormality of boosting circuit of semiconductor device

An assembled battery system that comprises a battery configured to include a plurality of battery cells connected in series and detects a voltage of each of the battery cells, the assembled battery system comprising:

• a first buffer amplifier, to which voltage of a higher level potential of the battery cell to be detected is inputted and that outputs a first voltage corresponding to the inputted voltage;
• a second buffer amplifier, to which voltage of a lower-level potential of the battery cell to be detected is inputted and that outputs a second voltage corresponding to the inputted voltage;
• a difference outputting section that outputs a difference between the first voltage and the second voltage;
• a boosting section that controls boosting voltage of the battery to supply as a driving voltage to the first buffer amplifier and the second buffer amplifier;
• and
• a controlled section, at which a control is conducted on whether or not the voltages to be supplied to the first buffer amplifier and the second buffer amplifier are to be boosted by the boosting section,
• wherein the first buffer amplifier and the second buffer amplifier restrict current from the battery flow to the difference of putting section.

A battery monitoring IC for detecting, in a battery that is configured to include a plurality of battery cells connected in series, a voltage of each of the battery cells, the battery monitoring IC comprising:

• a first buffer amplifier, to which voltage of a higher level potential of the battery cell to be detected is inputted and that outputs a first voltage corresponding to the inputted voltage;
• a second buffer amplifier, to which voltage of a lower level potential of the battery cell to be detected is inputted and that outputs a second voltage corresponding to the inputted voltage;
• a difference outputting section that outputs a difference between the first voltage and the second voltage;
• a boosting section that controls boosting voltage of the battery to supply as driving voltages to the first buffer amplifier and the second buffer amplifier;
• and
• a controlled section, at which a control is conducted on whether or not the voltages to be supplied to the first buffer amplifier and the second buffer amplifier are to be boosted by the boosting section, wherein
• the first buffer amplifier and the second buffer amplifier restrict current from the battery flow through the difference of putting section.