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CAT661 Datasheet(PDF) 11 Page - ON Semiconductor

Part # CAT661
Description  High Frequency 100 mA CMOS Charge Pump, Inverter/Doubler
PDF  16 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT661 Datasheet(HTML) 11 Page - ON Semiconductor

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CAT661
http://onsemi.com
11
Typical Applications
Voltage Inversion Positive−to−Negative
The CAT661 easily provides a negative supply voltage from a positive supply in the system. Figure 24 shows a typical circuit.
The LV pin may be left floating for positive input voltages at or above 3.3 V.
Figure 24. Voltage Inverter
+
C2
CAT661
NC
+
C1
BOOST/FC
V+
OSC
LV
OUT
1
2
3
4
8
7
6
5
CAP+
CAP−
GND
VIN
1.5 V to 5.5 V
VOUT = −VIN
Positive Voltage Doubler
The voltage doubler circuit shown in Figure 25 gives VOUT = 2 x VIN for input voltages from 2.5 V to 5.5 V.
Figure 25. Voltage Doubler
CAT661
+
BOOST/FC
+
2.5 V to 5.5 V
1N5817*
*SCHOTTKY DIODE IS FOR START−UP ONLY
V+
OSC
LV
OUT
C2
150 mF
VOUT = 2VIN
8
7
6
5
1
2
3
4
C1
150 mF
CAP+
CAP−
GND
VIN



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