1 Features
1• Inverts or Doubles Input Supply Voltage
• 3.5-Ω Typical Output Resistance
• 86% Typical Conversion Efficiency at 200 mA
• (LM2662) Selectable Oscillator Frequency: 20
kHz/150 kHz
• (LM2663) Low Current Shutdown Mode

2 Applications
• Laptop Computers
• Cellular Phones
• Medical Instruments
• Operational Amplifier Power Supplies
• Interface Power Supplies
• Handheld Instruments

3 Description
The LM2662/LM2663 CMOS charge-pump voltage
converter inverts a positive voltage in the range of 1.5 V to 5.5 V to the corresponding negative voltage. The
LM2662/LM2663 uses two low cost capacitors to
provide 200 mA of output current without the cost,
size, and EMI related to inductor based converters.
With an operating current of only 300 μA and operating efficiency greater than 90% at most loads,
the LM2662/LM2663 provides ideal performance for
battery powered systems. The LM2662/LM2663 may
also be used as a positive voltage doubler.
The oscillator frequency can be lowered by adding an
external capacitor to the OSC pin. Also, the OSC pin
may be used to drive the LM2662/LM2663 with an external clock. For LM2662, a frequency control (FC)
pin selects the oscillator frequency of 20 kHz or 150
kHz. For LM2663, an external shutdown (SD) pin
replaces the FC pin. The SD pin can be used to
disable the device and reduce the quiescent current
to 10 μA. The oscillator frequency for LM2663 is 150
kHz.