LM2662

开关电容器电压转换器

The /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.

.

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