CAT660_07 Datasheet, PDF (11/16 Pages) Catalyst Semiconductor – 100mA CMOS Charge Pump Inverter/Doubler

CAT660
PRECISION VOLTAGE DIVIDER
A precision voltage divider is shown in figure 9. With very light load currents under 100nA, the voltage at pin 2 will be
within 0.002% of V+/2 . Output voltage accuracy decreases with increasing load.
+
V+
2
+
0.002%
+
IL < 100nA
1 _BOOST/FC
V+ ⁸
2 _CAP+
OSC ⁷
3
CAT660
GND
LV ⁶
4 _CAP-
OUT ⁵
V+
3V to 11V
Figure 9: Precision Voltage Divider (Load ≤ 100nA)
BATTERY VOLTAGE SPLITTER
Positive and negative voltages that track each other can be obtained from a battery. Figure 10 shows how a 9V battery
can provide symmetrical positive and negative voltages equal to one-half the battery voltage.
BATTERY
9V
VBAT
3V < VBAT < 11V
+
C1
150µF
1 _BOOST/FC
V+ ⁸
2 _CAP+
OSC ⁷
3
CAT660
GND
LV ⁶
4 _CAP-
OUT ⁵
+ ^VBAT (4.5V)
2
-
VBAT
2
(-4.5V)
C2
+ _150µF
Figure 10: Battery Splitter
11
Doc. No. MD-5000, Rev. W