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LM2781 - Ultra-Low Ripple Switched Capacitor Voltage Inverter

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.

Features

  • n Inverts Input Voltage n Ultra-Low Voltage Ripple and 8Ω Typical Output Resistance with Two Flying Capacitors n Output Resistance of 18Ω Using One Flying Capacitor n 210kHz (typ. ) Switching Frequency n 8-pin micro SMD Package (1.4mm x 1.4mm x 0.5mm).

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March 2003 www.DataSheet4U.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.
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