LM2781 Datasheet (National Semiconductor) - Ultra-Low Ripple Switched Capacitor Voltage Inverter

LM2781, 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 s

LM2781 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) Applications n n n n n n Cellular Phones Pagers