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1FEATURES

2? Inverts Input Supply Voltage

? SOT-23 Package

? 20Ω Typical Output Impedance

? 97% Typical Conversion Efficiency at 5 mA

APPLICATIONS

? Cellular Phones

? Pagers

? PDAs

? Operational Amplifier Power Supplies

? Interface Power Supplies

? Handheld Instruments

DESCRIPTION

The LM828 CMOS charge-pump voltage converter

inverts a positive voltage in the range of +1.8V to

+5.5V to the corresponding negative voltage of ?1.8V

to ?5.5V. The LM828 uses two low cost capacitors to

provide up to 25 mA of output current.

The LM828 operates at 12 kHz switching frequency

to reduce output resistance and voltage ripple. With

an operating current of only 40 μA (operating

efficiency greater than 96% with most loads), the

LM828 provides ideal performance for battery

powered systems. The device is in a tiny SOT-23

package.