LM2662M Switched Capacitor Voltage Converter diode rectifier circuit

Features

►Inverts or doubles input supply voltage

► Narrow SO-8 Package

► 3.5Ω typical output resistance

► 86% typical conversion efficiency at 200 mA

► (LM2662) selectable oscillator frequency: 20 kHz/150 kHz

► (LM2663) low current shutdown mode

Applications

► Laptop computers

► Cellular phones

► Medical instruments

► Operational amplifier power supplies

► Interface power supplies

► Handheld instruments

General Description

The LM2662/LM2663 CMOS charge-pump voltage converter inverts a positive voltage in the range of 1.5V to 5.5V 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.

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