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LM828M5 Datasheet(PDF) 8 Page - Texas Instruments

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No. de pieza LM828M5
Descripción Electrónicos  LM828 Switched Capacitor Voltage Converter
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LM828M5 Datasheet(HTML) 8 Page - Texas Instruments

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LM828
SNOS035D – MARCH 2010 – REVISED MAY 2013
www.ti.com
REGULATING VOUT
It is possible to regulate the negative output of the LM828 by use of a low dropout regulator (such as the
LP2980). The whole converter is depicted in Figure 16. This converter can give a regulated output from
−1.8V to
−5.5V by choosing the proper resistor ratio:
Vout = Vref (1 + R1/R2)
(6)
where, Vref = 1.23V
(7)
Note that the following conditions must be satisfied simultaneously for worst case design:
Vin_min >Vout_min +Vdrop_max (LP2980)
(8)
+ Iout_max × Rout_max (LM828)
(9)
Vin_max < Vout_max +Vdrop_min (LP2980)
(10)
+ Iout_min × Rout_min (LM828)
(11)
Figure 16. Combining LM828 with LP2980 to Make a Negative Adjustable Regulator
8
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Product Folder Links: LM828


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