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A high temperature voltage regulator ASIC with auxiliary control and watch-dog functions has been designed for ambient temperatures from 273" K to 473" K. The circuit is implemented in a standard bulk 1.21m BiCMOS process and has been tested for temperatures up to 563" K. The regulated output voltage range is externally adjustable from 5 to 12V, and the regulator can deliver output currents up to 25OmA. The quiescent current consumption is 2.7mA. The accuracy of the output voltage is almost exclusively determined by the on chip bandgap voltage accuracy because of the high loop-gain of the error amplifier. The bandgap voltage is nominally 1.25V. The measured variation over the temperature range 273" K to 473" K is 15mV (-1.2%). The area of the chip is 5.2mm2, whereof the power transistor occupies more than 50%. The circuit is called HTPOWER-OO1B and will be manufactured by Maritime Well Services (MWS). The chip is part of a new family of oil well electronics based on SRVTEFs high temperature ASICs called HTASIC@, but is also suitable for different other applications with demand for high temperature operation.

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