CAT660

http://onsemi.com

11

Precision Voltage Divider

A precision voltage divider is shown in Figure 20. With very light load currents under 100 nA, the voltage at pin 2 will be

within 0.002% of V+/2. Output voltage accuracy decreases with increasing load.

Figure 20. Precision Voltage Divider (Load 3 100 nA)

+

+

BOOST/FC

V+

OSC

LV

OUT

CAT660

C2

150 mF

C1

150 mF

1

2

3

4

CAP+

CAP−

GND

8

7

6

5

3 V to 11 V

± 0.002%

2

Battery Voltage Splitter

Positive and negative voltages that track each other can be obtained from a battery. Figure 21 shows how a 9 V battery can

provide symmetrical positive and negative voltages equal to one−half the battery voltage.

Figure 21. Battery Splitter

+

CAT660

+

BOOST/FC

V+

OSC

LV

OUT

9 V

BATTERY

C1

150 mF

1

CAP+

CAP−

GND

2

3

4

8

7

6

5

C2

150 mF

*

2

(−4.5 V)

)

2

(4.5 V)