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LM2766 Datasheet(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM2766
Description  Switched Capacitor Voltage Converter
Download  9 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2766 Datasheet(HTML) 7 Page - National Semiconductor (TI)

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Application Information (Continued)
TABLE 1. Low ESR Capacitor Manufacturers (Continued)
Manufacturer
Phone
Website
Capacitor Type
Murata
(800)-831-9172
www.murata.com
Ceramic chip capacitors
Taiyo Yuden
(800)-348-2496
www.t-yuden.com
Ceramic chip capacitors
Tokin
(408)-432-8020
www.tokin.com
Ceramic chip capacitors
Other Applications
Paralleling Devices
Any number of LM2766s can be paralleled to reduce the out-
put resistance. Each device must have its own pumping ca-
pacitor C
1, while only one output capacitor Cout is needed as
shown in Figure 3. The composite output resistance is:
Cascading Devices
Cascading the LM2766s is an easy way to produce a greater
voltage (A two-stage cascade circuit is shown in Figure 4).
The effective output resistance is equal to the weighted sum
of each individual device:
R
out = 1.5Rout_1 +Rout_2
Note that increasing the number of cascading stages is prac-
itically limited since it significantly reduces the efficiency, in-
creases the output resistance and output voltage ripple.
DS101282-19
FIGURE 3. Lowering Output Resistance by Paralleling Devices
DS101282-20
FIGURE 4. Increasing Output Voltage by Cascading Devices
www.national.com
7


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