cat660 Catalyst Semiconductor, cat660 Datasheet - Page 10

• Manufacturer Part Number: cat660
• Description: 100ma Cmos Charge Pump Inverter/doubler
• Manufacturer: Catalyst Semiconductor

POSITIVE VOLTAGE DOUBLER
The voltage doubler circuit shown in figure 8 gives V
Doc. No. MD-5000, Rev. W
TYPICAL APPLICATIONS
VOLTAGE INVERSION POSITIVE-TO-NEGATIVE
The CAT660 easily provides a negative supply voltage from a positive supply in the system. Figure 7 shows a typical
circuit. The LV pin may be left floating for positive input voltages at or above 3.3V.
2.5V to 5.5V
V IN
C1
*SCHOTTKY DIODE IS FOR START-UP ONLY
+
NC
+
1
2
3
4
Figure 7: Voltage Inverter
Figure 8: Voltage Doubler
BOOST/FC
CAP+
GND
CAP-
1
2
3
4
1N5817*
CAT660
BOOST/FC
CAP+
GND
CAP-
OUT
CAT660
10
= 2 x V
OSC
OUT
V+
LV
8
7
6
5
OSC
OUT
IN
V+
LV
for input voltages from 2.5V to 5.5V.
8
7
6
5
+
C2
+
V IN
1.5V to 5.5V
V OUT = -V IN
V OUT = 2V IN