NOVELTY - The semiconductor device (110) comprises an integrated circuit to sense a voltage of a battery cell and to output a control signal, a charge switch electrically coupled to the integrated circuit and configured to interrupt a charge path according to the control signal output from the integrated circuit, a first lead (113a, 113b) electrically coupled to the integrated circuit, a second lead (113c) electrically coupled to the charge switch, and a sealing portion (115) that seals the integrated circuit, charge switch, the first lead and the second lead.    USE - The semiconductor device is useful in a protection circuit module of a battery pack (claimed) for protecting a battery cell such as lithium ion secondary battery and a lithium polymer secondary battery, which is useful as power sources for portable electronic devices such as notebook computers, mobile phones, personal digital assistants and other typical electronic devices.    ADVANTAGE - The semiconductor device can be economically manufactured with increased integration density, compact size and reduced scale, protects the secondary battery from unnecessary overcharge, overdischarge or over-current, prevents the secondary battery from deterioration in its performance, and reduces the risk of danger such as leakage, explosion and fire to the batteries due to malfunction.    DETAILED DESCRIPTION - The semiconductor device (110) comprises an integrated circuit to sense a voltage of a battery cell and to output a control signal, a charge switch electrically coupled to the integrated circuit and configured to interrupt a charge path according to the control signal output from the integrated circuit, a first lead (113a, 113b) electrically coupled to the integrated circuit, a second lead (113c) electrically coupled to the charge switch, and a sealing portion (115) that seals the integrated circuit, the charge switch, the first lead and the second lead. The integrated circuit and the charge switch are coupled to each other by a conductive wire. The integrated circuit and the first lead are coupled to each other by a conductive wire. The charge switch and the second lead are coupled to each other by a conductive wire. The first lead and the second lead protrude outside the sealing portion. The first lead comprises a first sub lead for supplying power to the integrated circuit, and a second sub lead for sensing a voltage of the battery cell. The first sub lead is arranged at one side of the sealing portion, and is electrically coupled to a battery terminal and pack terminal. The second sub lead and the second lead are aligned with each other at the other side of the sealing portion facing the first sub lead. The second sub lead is electrically coupled to a pack terminal. The second lead is electrically coupled to a pack terminal. The sealing portion comprises an integrated circuit mounting board, a charge switch mounting board and a dummy lead. The integrated circuit is mounted on the integrated circuit mounting board. The integrated circuit mounting board is coupled to the integrated circuit using an insulating adhesive. The charge switch is mounted on the charge switch mounting board. The charge switch mounting board is coupled to the charge switch using a conductive adhesive, and protrudes outside the sealing portion. The dummy lead protrudes outside the sealing portion, and is formed at the same side of the sealing portion as the first sub lead of the sealing portion. An INDEPENDENT CLAIM is included for a battery pack.    DESCRIPTION OF DRAWING(S) - The diagram shows a plan view of a semiconductor device for protecting a battery cell.    Semiconductor device (110)    First leads (113a, 113b)    Second lead (113c)    Sealing portion. (115)