_______________General Description

The MAX1044 and ICL7660 are monolithic, CMOS

switched-capacitor voltage converters that invert, dou-

ble, divide, or multiply a positive input voltage. They are

pin compatible with the industry-standard ICL7660 and

LTC1044. Operation is guaranteed from 1.5V to 10V with

no external diode over the full temperature range. They

deliver 10mA with a 0.5V output drop. The MAX1044

has a BOOST pin that raises the oscillator frequency

above the audio band and reduces external capacitor

size requirements.

The MAX1044/ICL7660 combine low quiescent current

and high efficiency. Oscillator control circuitry and four

power MOSFET switches are included on-chip.

Applications include generating a -5V supply from a

+5V logic supply to power analog circuitry. For applica-

tions requiring more power, the MAX660 delivers up to

100mA with a voltage drop of less than 0.65V.

________________________Applications

-5V Supply from +5V Logic Supply

Personal Communications Equipment

Portable Telephones

Op-Amp Power Supplies

EIA/TIA-232E and EIA/TIA-562 Power Supplies

Data-Acquisition Systems

Hand-Held Instruments

Panel Meters

____________________________Features

o Miniature µMAX Package

o 1.5V to 10.0V Operating Supply Voltage Range

o 98% Typical Power-Conversion Efficiency

o Invert, Double, Divide, or Multiply Input Voltages

o BOOST Pin Increases Switching Frequencies

(MAX1044)

o No-Load Supply Current: 200µA Max at 5V

o No External Diode Required for Higher-Voltage

Operation

______________Ordering Information

Ordering Information continued at end of data sheet.

* Contact factory for dice specifications.

Switched-Capacitor Voltage Converters

________________________________________________________________

Maxim Integrated Products

1

Call toll free 1-800-998-8800 for free samples or literature.

19-4667; Rev 1; 7/94

MAX1044

ICL7660

4

3

2

1

CAP-

GND

CAP+

(N.C.) BOOST

5

6

7

8

LV

OSC

V+

TOP VIEW

( ) ARE FOR ICL7660

DIP/SO/µMAX

TO-99

ICL7660

N.C.

CAP+

GND

CAP-

LV

OSC

V+ AND CASE

1

2

3

4

5

6

7

8

_________________Pin Configurations

NEGATIVE VOLTAGE CONVERTER

CAP+

CAP-

V+

GND

INPUT

SUPPLY

VOLTAGE

NEGATIVE

OUTPUT

VOLTAGE

MAX1044

ICL7660

__________Typical Operating Circuit

Dice*

8 SO

8 Plastic DIP

PIN-PACKAGE

TEMP. RANGE

0°C to +70°C

0°C to +70°C

0°C to +70°C

MAX1044C/D

MAX1044CSA

MAX1044CPA

PART

8 Plastic DIP

-40°C to +85°C

MAX1044EPA