CAT661 Datasheet, PDF (11/16 Pages) Catalyst Semiconductor – High Frequency 100mA CMOS Charge Pump, Inverter/Doubler

CAT661
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.
NC
+
C1
CAT661
1
BOOST/FC
2
CAP+
3
GND
4
CAP−
V+ ⁸
7
OSC
6
LV
OUT ⁵
V_IN
1.5 V to 5.5 V
C2
+
V_OUT = −V_IN
Figure 24. Voltage Inverter
Positive Voltage Doubler
The voltage doubler circuit shown in Figure 25 gives V_OUT = 2 x V_IN for input voltages from 2.5 V to 5.5 V.
1N5817*
V_IN
2.5 V to 5.5 V
C1 ⁺
150 mF
CAT661
1
BOOST/FC
2
CAP+
3
GND
4
CAP−
8
V+
7
OSC
6
LV
5
OUT
*SCHOTTKY DIODE IS FOR START−UP ONLY
Figure 25. Voltage Doubler
V_OUT = 2V_IN
+
C2
150 mF
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