CAT661_07 datasheet(2/17 Pages) CATALYST

Part #	CAT661

Description	High Frequency 100mA CMOS Charge Pump, Inverter/Doubler

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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2 / 17 page

CAT661

2

Doc. No. MD-5003, Rev. K

Oscillator Frequency

25kHz typical, 10kHz minimum

135kHz typical, 80kHz minimum

PIN CONFIGURATION

PIN DESCRIPTIONS

Circuit Configuration

Pin Number

Name

Inverter

Doubler

Boost/FC

Oscillator Frequency

Open

40kHz typical

V+

135kHz typical, 40kHz 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

LV must be tied to OUT for all input

voltages.

8

V+

Power supply. Positive voltage input.

Positive voltage output.

Freqency Control for the internal oscillator.

With an external oscillator BOOST/FC has

no effect.

Same as inverter.

Low-Voltage selection pin. When the input

voltage is less than 3V, connect LV to GND.

For input voltages above 3V, LV may be

connected to GND or left open. If OSC is

driven externally, connect LV to GND.

Oscillator control input. An external capacitor

can be connected 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.

7

OSC

1

Boost/FC

SOIC 8-Lead (V)

PDIP 8-Lead (L)

8

7

6

5

1

2

3

4

BOOST/FC

CAP+

GND

CAP-

V+

OSC

LV

OUT

CAT661

(Top View)

ORDERING INFORMATION

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Note: All packages are RoHS compliant.

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