CAT661_12 Datasheet, PDF (12/14 Pages) ON Semiconductor – High Frequency 100 mA CMOS Charge Pump, Inverter/Doubler

CAT661
Precision Voltage Divider
A precision voltage divider is shown in Figure 26. With load currents under 100 nA, the voltage at pin 2 will be within 0.002%
of V+/2.
+
C1
150 mF
V⁾ _{± 0.002%}
2
+
I_L ≤ 100 nA
CAT661
1
BOOST/FC
2
CAP+
3
GND
4
CAP−
8
V+
7
OSC
6
LV
5
OUT
C2
150 mF
V⁺
3 V to 11 V
Figure 26. Precision Voltage Divider (Load 3 100 nA)
Battery Voltage Splitter
Positive and negative voltages that track each other can be obtained from a battery. Figure 27 shows how a 9 V battery can
provide symmetrical positive and negative voltages equal to one−half the battery voltage.
BATTERY
9V
V_BAT
3 V ≤ V_BAT ≤ 11 V
+
C1
150 mF
CAT661
1
8
BOOST/FC V+
2
CAP+
7
OSC
3
GND
6
LV
4
CAP−
5
OUT
)
V_BAT
2
(4.5
V)
*
V_BAT
2
(−4.5
V)
C2
150 mF
+
Figure 27. Battery Splitter
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