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

CAT661
POSITIVE VOLTAGE DOUBLER
The voltage doubler circuit shown in figure 9 gives VOUT = 2 x VIN 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
CAT661 ₆
GND
LV
4
CAP-
5
OUT
*SCHOTTKY DIODE IS FOR START-UP ONLY
Figure 9: Voltage Doubler
VOUT = 2VIN
PRECISION VOLTAGE DIVIDER
A precision voltage divider is shown in figure 10. With load currents under 100nA, the voltage at pin 2 will be within
0.002% of V+/2 .
+
V+
2
+
0.002%
+
IL < 100nA
1 _BOOST/FC
V+ ⁸
2 _CAP+
OSC ⁷
3
CAT661
GND
LV ⁶
4 _CAP-
OUT ⁵
V+
3V to 11V
Figure 10: Precision Voltage Divider (Load ≤ 100nA)
11
Doc. No. 5003, Rev. J