Ultra-Low Ripple Switched Capacitor Voltage Inverter

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 single-phase Charge Pump circuits. If larger output ripple CAN be tolerated, optional capacitor C2 may be omitted to reduce the cost and size of the solution. The LM2781 is available in an 8-pin Micro SMD chip-scale package.
See also: LM2780, a slow Clock (12kHz typ) version of this topology with extremely low supply current.
By National Semiconductor Corporation
LM2781 's PackagesLM2781 's pdf datasheet

LM2781 Pinout, Pinouts
LM2781 pinout,Pin out
This is one package pinout of LM2781,If you need more pinouts please download LM2781's pdf datasheet.

LM2781 Application circuits
LM2781 circuits
This is one application circuit of LM2781,If you need more circuits,please download LM2781's pdf datasheet.

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