Update: 30 September, 2023
The LM2660/LM2661 switched capacitor voltage converter is a CMOS charge pump voltage converter that inverts a positive voltage in the range of 1.5V to 5.5V to the corresponding negative voltage. The LM2660/LM2661 uses two low cost capacitors to provide 100mA of output current without the cost, size, and EMI related to inductor based converters. With an operating current of only 120µA and operating efficiency greater than 90% at most loads, the LM2660/LM2661 provides ideal performance for battery powered systems. The LM2660/LM2661 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 LM2660/LM2661 with an external clock. For LM2660, a frequency control (FC) pin selects the oscillator frequency of 10kHz or 80kHz. For LM2661, 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 0.5µA. The oscillator frequency for the LM2661 is 80kHz.
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MD5 Checksum: 45BA7C11977413A17CA9D85534CA1E39
Publication date: 08 May, 2012
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PDF Link: National Semiconductor LM2660/LM2661 Switched Capacitor Voltage Converter PDF