General Description

The MAX1044 and ICL7660 are monolithic, CMOS

switched-capacitor voltage converters that invert, double,

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 applications 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

● Miniature μMAX Package

● 1.5V to 10.0V Operating Supply Voltage Range

● 98% Typical Power-Conversion Efficiency

● Invert, Double, Divide, or Multiply Input Voltages

● BOOST Pin Increases Switching Frequencies

(MAX1044)

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

● No External Diode Required for Higher-Voltage

Operation

19-4667; Rev 2; 2/17

Ordering Information appears at end of data sheet.

NEGATIVE VOLTAGE CONVERTER

CAP+

CAP-

V+

VOUT

GND

INPUT

SUPPLY

VOLTAGE

NEGATIVE

OUTPUT

VOLTAGE

MAX1044

ICL7660

MAX1044

ICL7660

+

4

3

2

1

CAP-

GND

CAP+

(N.C.) BOOST

5

6

7

8

VOUT

LV

OSC

V+

TOP VIEW

( ) ARE FOR ICL7660

DIP/SO/µMAX

TO-99

ICL7660

N.C.

CAP+

GND

CAP-

VOUT

LV

OSC

V+ AND CASE

1

2

3

4

5

6

7

8

Typical Operating Circuit

Pin Configurations

MAX1044/ICL7660

Switched-Capacitor Voltage Converters