Integrated circuit power transistor array

Details Integrated circuit power transistor array Integrated circuit power transistor array

H - Electricity

01

L

356/124, 356/30

H01L 27/04 (2006.01) H01L 27/082 (2006.01) H01L 27/102 (2006.01)

Patent

CA 1183278

ABSTRACT OF THE DISCLOSURE A power transistor array integrated circuit includes an array of transistors, each having an electrode connected in common to a conductive line forming a part of the integrated circuit. The electrodes of the trans- istors are spaced along the conductive line and have a decreasing length in a given direction along the conductive line and have a decreasing length in a given direction along the conductive line. The conductive line has a corresponding increasing width in the given direction. The decrease in length of the electrode and the increase in width of the conductive line are such that the electrodes and the conductive line form a generally rectangular shape. Differences in turn-on voltage for the transistors resulting from the differences in their elec- trode length tend to compensate for voltage drop in the conductive line, thus giving uniform outputs from the trans- istors in the array. A region forming a reverse biased P-N junction to isolate circuit elements in the integrated circuit from one another is used as part of a conductive path to circuit ground and has a surface contact region of like conductivity and more highly doped than the reverse biased P-N junction region. The integrated circuit of this invention is especially useful as a thermal print- head driver circuit.

400917

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