A 1-A buck boost dc-to-dc power convertor accepts input ranging from 6 V to 70 V while output remains constant. It is available in 3, 5, 9, 12, and 15-V output models. Designed for use in portable medical devices, the convertor offers ±2% output voltage tolerance with excellent line and load rejection characteristics. The unit is short-circuit proof and can be operated at a maximum ambient temperature of 85°C. Extended input range down to 4 V is available. Tech 9 Corp., Mounds View, MN, 763/717-0326.