Reverse battery protection monolithic device

There is described a device for protecting electrically powered units (195, 695, 795, 895) against a reverse application of a power supply (190, 790, 890). The described device comprises a first input terminal (102, 202, 302, 402, 502, 602, 702, 802) adapted to be connected to a first terminal of the power supply (190, 790, 890), a second input terminal (104, 204, 304, 404, 504, 604, 704, 804) adapted to be connected to a second terminal of the power supply (190, 790, 890), an output terminal (106, 206, 306, 406, 506, 606, 706, 806), a PTC element (110, 210, 310, 410, 510, 610, 710, 810) arranged between the first input terminal (102, 202, 302, 402, 502, 602, 702, 802) and the output terminal (106, 206, 306, 406, 506, 606, 706, 806), and a heating element thermally coupled to the PTC element (110, 210, 310, 410, 510, 610, 710, 810) and adapted to increase the temperature of the PTC element (110, 210, 310, 410, 510, 610, 710, 810) in case the first input terminal (102, 202, 302, 402, 502, 602, 702, 802) is connected to the second terminal of the power supply and the second input terminal (104, 204, 304, 404, 504, 604, 704, 804) is connected to the first terminal of the power supply, thereby causing an increased electrical resistance between the first input terminal (102, 202, 302, 402, 502, 602, 702, 802) and the output terminal (106, 206, 306, 406, 506, 606, 706, 806).