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LM2781

Part Number	LM2781
Manufacturer	National Semiconductor
Description	Ultra-Low Ripple Switched Capacitor Voltage Inverter
Published	Apr 22, 2010
Detailed Description	March 2003 com LM2781 Ultra-Low Ripple Switched Capacitor Voltage Inverter LM2781 Ultra-Low Ripple Swi...
Datasheet	LM2781 PDF File

Overview

March 2003 com LM2781 Ultra-Low Ripple Switched Capacitor Voltage Inverter LM2781 Ultra-Low Ripple Switched Capacitor Voltage Inverter General Description The LM2781 is a charge pump that inverts an input voltage in the range of 1.
8V to 5.
5V to the corresponding output voltage of -1.
8V to -5.
5V.
With use of three or four low-cost external ceramic capacitors, the LM2781 can provide up to 50mA of output current.
The LM2781 operates at a 210kHz typical switching frequency to minimize supply current (0.
7mA typ.
).
Two charge pumps operate 180˚ out of phase to significantly reduce the output voltage ripple compared to that of traditional singlephase charge pump circuits.
If large...

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