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( File format: PDF, 142547 )
Switched Capacitor Voltage Converter
Linear Technology Inc.

Description
The LTC1044 is a monolithic CMOS switched capacitor voltage converter which is manufactured using Linear Technology's enhanced LTCMOSTM silicon gate process. The LTC1044 provides several voltage conversion functions: the input voltage can be inverted (VOUT=-VIN), doubled (VOUT=2 VIN), divided (VOUT=VIN/2) or multiplied (VOUT=?nVIN). Designed to be pin-for-pin and functionally compatible with the popular 7660, the LTC1044 provides significant features and improvements over earlier 7660 designs. These improvements include: full 1.5V to 9V supply operation over the entire operating temperature range, without the need for external protection diodes; 21/2 times lower quiescent current for greater power conversion efficiency; and a "boost" function which is available to raise the internal oscillator frequency to optimize performance in specific applications. Although the LTC1044 provides significant design and performance advantages over the earlier 7660 device, it still maintains its still maintains its compatibility with existing 7660 designs.
Features
Plug-In Compatible with 7660 with These Additional :Guaranteed Operation to 9V, with No External Diode, Over Full Temperature RangeBoost Pin (Pin 1) for Higher Switching FrequencyLower Quiescent PowerEfficient Voltage Doubler200?A Max. No Load Supply Current at 5V97% Min. Open Circuit Voltage Conversion Efficiency95% Min. Power Conversion EfficiencyWide Operating Supply Voltage Range, 1.5V to 9VEasy to UseCommercial Device Guaranteed Over -40C to 85C Temperature Range




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