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LM2664M6X Fiches technique(PDF) 8 Page - Texas Instruments

No de pièce LM2664M6X
Description  Switched Capacitor Voltage Converter
Download  9 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

LM2664M6X Fiches technique(HTML) 8 Page - Texas Instruments

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Other Applications (Continued)
REGULATING V
OUT
It is possible to regulate the negative output of the LM2664
by use of a low dropout regulator (such as LP2980). The
whole converter is depicted in Figure 6. This converter can
give a regulated output from −1.8V to −5.5V by choosing the
proper resistor ratio:
V
out =Vref (1+R1/R2)
where, V
ref = 1.23V
Note that, the following conditions must be satisfied simulta-
neously for worst case design:
V
in_min >Vout_min +Vdrop_max (LP2980)
+I
out_max xRout_max (LM2664)
V
in_max < Vout_max +Vdrop_min (LP2980)
+I
out_min xRout_min (LM2664)
10003112
FIGURE 5. Combined Voltage Doubler and Inverter
10003124
FIGURE 6. Combining LM2664 with LP2980 to Make a Negative Adjustable Regulator
www.national.com
8


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