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Text: 19- 1783; Rev 0; 6/97 High-Efficiency, Step-Up DC-DC Converters for 1V Inputs Features The MAXI 642/MAXI 643 are high-efficiency, low-voltage, step-up DC-DC converters intended for devices pow­ ered by a single alkaline cell. They feature low quies­ cent supply currents and are supplied in the ultra-small