CAT661

12

Doc. No. 5003, Rev. J

BATTERY VOLTAGE SPLITTER

Positive and negative voltages that track each other can be obtained from a battery. Figure 11 shows how a 9V battery

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

CASCADE OPERATION FOR HIGHER NEGATIVE VOLTAGES

The CAT661 can be cascaded as shown in figure 12 to generate more negative voltage levels. The output resistance

is approximately the sum of the individual CAT661 output resistance.

Figure 11: Battery Splitter

Figure 12: Cascading to Increase Output Voltage

+

-

(-4.5V)

1

2

3

4

8

7

6

5

CAT661

+

BOOST/FC

CAP+

GND

CAP-

V+

OSC

LV

OUT

+

(4.5V)

3V < VBAT < 11V

VBAT

9V

BATTERY

VBAT

2

VBAT

2

+

C2

2

3

4

8

5

CAT661

"1"

+

C1

+

CAT661

"N"

2

3

4

8

5

C1N

+VIN

+

C2

VOUT = -NVIN