LM2664

SNVS005E – NOVEMBER 1999 – REVISED DECEMBER 2014

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The peak-to-peak output voltage ripple is determined by the oscillator frequency, the capacitance and ESR of the

(2)

Again, using a low ESR capacitor will result in lower ripple.

9.2.2.1 Paralleling Devices

Any number of LM2664s can be paralleled to reduce the output resistance. Each device must have its own

output resistance is:

(3)

Figure 12. Lowering Output Resistance by Paralleling Devices

9.2.2.2 Cascading Devices

Cascading the LM2664 devices is an easy way to produce a greater negative voltage (a two-stage cascade

circuit is shown in Figure 13).

effective output resistance is equal to the weighted sum of each individual device:

(4)

NOTE

The number of n is practically limited since the increasing of n significantly reduces the

efficiency, and increases the output resistance and output voltage ripple.

10

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