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MAX828 Datasheet(PDF) 5 Page - ON Semiconductor

Part No. MAX828
Description  Switched Capacitor Voltage Converters
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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MAX828 Datasheet(HTML) 5 Page - ON Semiconductor

 
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MAX828 MAX829
http://onsemi.com
5
Figure 5. Paralleling MAX828s or MAX829s to
Reduce Output Resistance
5
4
32
1
+
MAX828
MAX829
“n”
...
C2
+
C1
5
4
32
1
MAX828
MAX829
“1”
+
C1
Vin+
Vout
Rout +
Rout OF SINGLE DEVICE
NUMBER OF DEVICES
Vout = Vin–
Voltage Doubler/Inverter
Another common application of the MAX828/829 is
shown in Figure 6. This circuit performs two functions in
combination. C1 and C2 form the standard inverter circuit
described above. C3 and C4 plus the two diodes form the
voltage doubler circuit. C1 and C3 are the pump capacitors
and C2 and C4 are the reservoir capacitors. Because both
sub–circuits rely on the same switches if either output is
loaded, both will droop toward GND. Make sure that the
total current drawn from both the outputs does not total more
than 40mA.
Figure 6. Combined Doubler and Inverter
5
4
32
1
+
MAX828
MAX829
C2
+
C1
Vin+
C3
+
+
C4
D1
D2
D1, D2 = 1N4148
Vout = Vin–
Vout = (2Vin) –
(VFD1) – (VFD2)
Diode Protection for Heavy Loads
When heavy loads require the OUT pin to sink large
currents being delivered by a positive source, diode
protection may be needed. The OUT pin should not be
allowed to be pulled above ground. This is accomplished by
connecting a Schottky diode (1N5817) as shown in Figure
7.
Figure 7. High V– Load Current
4
1
MAX828
MAX829
GND
OUT
Layout Considerations
As with any switching power supply circuit good layout
practice is recommended.
Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.


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