1FEATURES
2• Inverts Then Doubles Input Supply Voltage
• Small VSSOP Package and SOIC Package
• 90Ω Typical Output Impedance
• 94% Typical Power Efficiency at 10 mA

APPLICATIONS
• LCD Contrast Biasing
• GaAs Power Amplifier Biasing
• Interface Power Supplies
• Handheld Instrumentation
• Laptop Computers and PDAs

DESCRIPTION
The LM2682 is a CMOS charge-pump voltage
inverter capable of converting positive voltage in the
range of +2.0V to +5.5V to the corresponding
doubled negative voltage of −4.0V to −11.0V
respectively. The LM2682 uses three low cost
capacitors to provide 10 mA of output current without
the cost, size, and EMI related to inductor based
circuits. With an operating current of only 150 μA and
an operating efficiency greater than 90% with most
loads, the LM2682 provides ideal performance for
battery powered systems. The LM2682 offers a
switching frequency of 6 kHz.