LM2766_15 Datasheet, PDF (11/20 Pages) Texas Instruments – LM2766 Switched Capacitor Voltage Converter

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LM2766
SNVS071C – MARCH 2000 – REVISED SEPTEMBER 2015
9.2.2.3 Paralleling Devices
Any number of LM2766 devices can be paralleled to reduce the output resistance. Because there is no closed
loop feedback, as found in regulated circuits, stable operation is assured. Each device must have its own
pumping capacitor C₁, while only one output capacitor C_OUT is needed as shown in Figure 13. The composite
output resistance is:
R_OUT
=
R_OUT of each LM2766
Number of Devices
(4)
Figure 13. Lowering Output Resistance By Paralleling Devices
9.2.2.4 Cascading Devices
Cascading the several LM2766 devices is an easy way to produce a greater voltage (a two-stage cascade circuit
is shown in Figure 14).
The effective output resistance is equal to the weighted sum of each individual device:
R_out = 1.5R_{out_1} + R_{out_2}
(5)
Note that increasing the number of cascading stages is practically limited because it significantly reduces the
efficiency, increases the output resistance and output voltage ripple.
Figure 14. Increasing Output Voltage By Cascading Devices
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