LM2660

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SNVS135D – SEPTEMBER 1999 – REVISED MAY 2013

CASCADING DEVICES

Cascading the LM2660s is an easy way to produce a greater negative voltage (as shown in Figure 19). If n is the

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

(5)

A three-stage cascade circuit shown in Figure 20 generates

Cascading is also possible when devices are operating in doubling mode. In Figure 21, two devices are

An example of using the circuit in Figure 20 or Figure 21 is generating +15V or

−15V from a +5V input.

Note that, 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.

Figure 19. Increasing Output Voltage by Cascading Devices

Figure 20. Generating

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