Product Descriptions

The LM2662/LM2663 CMOS charge-pump voltageconverter inverts a positive voltage in the range of 1.5V to 5.5 V to the corresponding negative voltage. TheLM2662/LM2663 uses two low cost capacitors toprovide 200 mA of output current without the costsize, and EMl related to inductor based converters.With an operating current of only 300 uA andoperating efficiency greater than 90 PERCENT at most loadsthe LM2662/LM2663 provides ideal performance forbattery powered systems. The LM2662/LM2663 mayalso be used as a positive voltage doubler.

The oscillator frequency can be lowered by adding anexternal capacitor to the OSC pin. Also, the oSC pinmay be used to drive the LM2662/LM2663 with anexternal clock. For LM2662, a frequency control (FC)pin selects the oscillator frequency of 20 kHz or 150kHz. For LM2663,an external shutdown (SD) pinreplaces the FC pin. The SD pin can be used todisable the device and reduce the quiescent currentto 10 uA. The oscillator frequency for LM2663 is 150kHz.

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