CAT660_07 Datasheet, PDF (10/16 Pages) Catalyst Semiconductor – 100mA CMOS Charge Pump Inverter/Doubler

CAT660
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.
NC
+
C1
1
BOOST/FC
8
V+
2
7
CAP+
OSC
3
CAT660 ₆
GND
LV
4 _CAP-
OUT ⁵
VIN
1.5V to 5.5V
C2 ^{VOUT = -VIN}
+
Figure 7: Voltage Inverter
POSITIVE VOLTAGE DOUBLER
The voltage doubler circuit shown in figure 8 gives V_OUT = 2 x V_IN for input voltages from 2.5V to 5.5V.
1N5817*
VIN
2.5V to 5.5V
1
8
BOOST/FC
V+
2
7
+
+
CAP+
OSC
3
CAT660 ₆
GND
LV
4
CAP-
5
OUT
*SCHOTTKY DIODE IS FOR START-UP ONLY
Figure 8: Voltage Doubler
VOUT = 2VIN
Doc. No. MD-5000, Rev. W
10