CAT660

http://onsemi.com

2

Typical Application

Figure 1. Voltage Inverter

V+

OSC

LV

OUT

CAT660

+

+

V+

OSC

LV

OUT

C1

C1

CAT660

1 mF to

150 mF

CAP+

GND

CAP−

BOOST/FC

1

2

3

4

8

7

6

5

C2

1 mF to

150 mF

1.5 V to 5.5 V

Inverted

Negative

Voltage

Output

8

7

6

5

CAP+

GND

CAP−

BOOST/FC

1

2

3

4

1 mF to

150 mF

to 5.5 V

1 mF to

150 mF

C2

Doubled

Positive

Voltage

Output

Figure 2. Positive Voltage Doubler

Table 1. PIN DESCRIPTIONS

Circuit Configuration

Pin Number

Name

Inverter Mode

Doubler Mode

1

Boost/FC

Frequency Control for the internal oscillator. With an external

oscillator BOOST/FC has no effect.

Same as inverter.

Boost/FC

Oscillator Frequency

Open

10 kHz typical, 5 kHz minimum

V+

80 kHz typical, 40 kHz minimum

2

CAP+

Charge pump capacitor. Positive terminal.

Same as inverter.

3

GND

Power supply ground.

Power supply. Positive voltage input.

4

CAP−

Charge pump capacitor. Negative terminal.

Same as inverter.

5

OUT

Output for negative voltage.

Power supply ground.

6

LV

Low−Voltage selection pin. When the input voltage is less

than 3 V, connect LV to GND. For input voltages above 3 V,

LV may be connected to GND or left open. If OSC is driven

externally, connect LV to GND.

LV must be tied to OUT for all input

voltages.

7

OSC

Oscillator control input. An external capacitor can be connec-

ted to lower the oscillator frequency. An external oscillator

can drive OSC and set the chip operating frequency. The

charge−pump frequency is one−half the frequency at OSC.

Same as inverter. Do not overdrive OSC

in doubling mode. Standard logic levels

will not be suitable. See the applications

section for additional information.

8

V+

Power supply. Positive voltage input.

Positive voltage output.