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CAT661

High Frequency 100 mA CMOS Charge Pump, Inverter/Doubler

ON Semiconductor 

CAT661

High Frequency 100 mA

CMOS Charge Pump,

Inverter/Doubler

Description

The CAT661 is a charge−pump voltage converter. It can invert a

positive input voltage to a negative output. Only two external

capacitors are needed. With a guaranteed 100 mA output current

capability, the CAT661 can replace a switching regulator and its

inductor. Lower EMI is achieved due to the absence of an inductor.

In addition, the CAT661 can double a voltage supplied from a

battery or power supply. Inputs from 2.5 V to 5.5 V will yield a

doubled, 5 V to 11 V output.

A Frequency Control pin (BOOST/FC) is provided to select either a

high (typically 135 kHz) or low (25 kHz) internal oscillator frequency,

thus allowing quiescent current vs. capacitor size trade−offs to be made.

The 135 kHz frequency is selected when the FC pin is connected to V+.

The operating frequency can also be adjusted with an external capacitor

at the OSC pin or by driving OSC with an external clock.

Both 8−pin DIP and SO packages are available. For die availability,

contact ON Semiconductor marketing.

The CAT661 can replace the MAX660 and the LTC660 in applications

where higher oscillator frequency and smaller capacitors are needed. In

addition, the CAT661 is pin compatible with the 7660/1044, offering an

easy upgrade for applications with 100 mA loads.

Features

• Converts V+ to V− or V+ to 2V+

• Low Output Resistance, 10 W Max.

• High Power Efficiency

• Selectable Charge Pump Frequency of 25 kHz or 135 kHz;

Optimize Capacitor Size

• Low Quiescent Current

• Pin−compatible to MAX660, LTC660 with Higher Frequency

Operation

• Available in 8−pin SOIC and DIP Packages

• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS

Compliant

Applications

• Negative Voltage Generator

• Voltage Doubler

• Voltage Splitter

• Low EMI Power Source

• GaAs FET Biasing

• Lithium Battery Power Supply

• Instrumentation

• LCD Contrast Bias

• Cellular Phones, Pagers

© Semiconductor Components Industries, LLC, 2010

1

May, 2010 − Rev. 11

http://onsemi.com

SOIC−8

V SUFFIX

CASE 751BD

PDIP−8

L SUFFIX

CASE 646AA

PIN CONFIGURATION

1

BOOST/FC

V+

CAP+

OSC

GND

LV

CAP−

OUT

(Top View)

MARKING DIAGRAMS

661ELA

661EVA

661ELA = CAT661ELA

661EVA = CAT661EVA or

660EVA = CAT661EVA−T3

ORDERING INFORMATION

Device

Package Shipping

CAT661ELA

CAT661EVA

PDIP−8

(Pb−Free)

SOIC−8

(Pb−Free)

50 / Tube

100 / Tube

CAT661EVA−T3

SOIC−8

3,000 /

(Pb−Free) Tape & Reel

Publication Order Number:

CAT661/D

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