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LM2665M6X Datenblatt(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Teilenummer LM2665M6X
Bauteilbeschribung  Switched Capacitor Voltage Converter
Download  8 Pages
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2665M6X Datenblatt(HTML) 7 Page - National Semiconductor (TI)

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Other Applications (Continued)
Cascading Devices
Cascading the LM2665s 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, the increasing of the number of cascading stages
is pracitically limited since it significantly reduces the effi-
ciency, increases the output resistance and output voltage
ripple.
Regulating V
OUT
It is possible to regulate the output of the LM2665 by use of
a low dropout regulator (such as LP2980-5.0). The whole
converter is depicted in Figure 5.
A different output voltage is possible by use of LP2980-3.3,
LP2980-3.0, or LP2980-adj.
Note that, the following conditions must be satisfied simulta-
neously for worst case design:
2V
in_min
>V
out_min +Vdrop_max (LP2980) + Iout_max xRout_max (LM2665)
2V
in_max < Vout_max +Vdrop_min (LP2980) + Iout_min xRout_min (LM2665)
DS100049-19
FIGURE 3. Lowering Output Resistance by Paralleling Devices
DS100049-20
FIGURE 4. Increasing Output Voltage by Cascading Devices
DS100049-21
FIGURE 5. Generate a Regulated +5V from +3V Input Voltage
www.national.com
7


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