CAT661

11

Doc. No. 5003, Rev. J

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.

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 .

Figure 9: Voltage Doubler

Figure 10: Precision Voltage Divider (Load

≤ 100nA)

1

2

3

4

8

7

6

5

CAT661

+

BOOST/FC

CAP+

GND

CAP-

VOUT = 2VIN

+

VIN

2.5V to 5.5V

1N5817*

*SCHOTTKY DIODE IS FOR START-UP ONLY

V+

OSC

LV

OUT

1

2

3

4

8

7

6

5

+

V+

3V to 11V

+

BOOST/FC

CAP+

GND

CAP-

V+

OSC

LV

OUT

CAT661

+ 0.002%

V+

2

IL < 100nA