FN3179 Rev 7.00

Page 1 of 13

January 23, 2013

FN3179

Rev 7.00

January 23, 2013

ICL7660S, ICL7660A

Super Voltage Converters

DATASHEET

The ICL7660S and ICL7660A Super Voltage Converters are

monolithic CMOS voltage conversion ICs that guarantee

significant performance advantages over other similar

devices. They are direct replacements for the industry

standard ICL7660 offering an extended operating supply

voltage range up to 12V, with lower supply current. A

Frequency Boost pin has been incorporated to enable the

user to achieve lower output impedance despite using smaller

capacitors. All improvements are highlighted in the “Electrical

Specifications” section on page 3. Critical parameters are

guaranteed over the entire commercial and industrial

temperature ranges.

The ICL7660S and ICL7660A perform supply voltage

conversions from positive to negative for an input range of

1.5V to 12V, resulting in complementary output voltages of

-1.5V to -12V. Only two non-critical external capacitors are

needed, for the charge pump and charge reservoir functions.

The ICL7660S and ICL7660A can be connected to function

as a voltage doubler and will generate up to 22.8V with a

12V input. They can also be used as a voltage multipliers or

voltage dividers.

Each chip contains a series DC power supply regulator, RC

oscillator, voltage level translator, and four output power

MOS switches. The oscillator, when unloaded, oscillates at a

nominal frequency of 10kHz for an input supply voltage of

5.0V. This frequency can be lowered by the addition of an

external capacitor to the “OSC” terminal, or the oscillator

may be over-driven by an external clock.

The “LV” terminal may be tied to GND to bypass the internal

series regulator and improve low voltage (LV) operation. At

medium to high voltages (3.5V to 12V), the LV pin is left

floating to prevent device latchup.

to CAP- is needed to guarantee latchup free operation (see

Do’s and Dont’s section on page 8).

Features

• Guaranteed Lower Max Supply Current for All

Temperature Ranges

• Wide Operating Voltage Range: 1.5V to 12V

• 100% Tested at 3V

• Boost Pin (Pin 1) for Higher Switching Frequency

• Guaranteed Minimum Power Efficiency of 96%

• Improved Minimum Open Circuit Voltage Conversion

Efficiency of 99%

• Improved SCR Latchup Protection

• Simple Conversion of +5V Logic Supply to ±5V Supplies

• Easy to Use; Requires Only Two External Non-Critical

Passive Components

• Improved Direct Replacement for Industry Standard

ICL7660 and Other Second Source Devices

• Pb-Free Available (RoHS Compliant)

Applications

• Simple Conversion of +5V to ±5V Supplies

• Negative Supplies for Data Acquisition Systems and

Instrumentation

• RS232 Power Supplies

Pin Configurations

ICL7660S

(8 LD PDIP, SOIC)

TOP VIEW

ICL7660A

(8 LD PDIP, SOIC)

TOP VIEW

BOOST

CAP+

GND

CAP-

1

2

3

4

8

7

6

5

V+

OSC

LV

NC

CAP+

GND

CAP-

1

2

3

4

8

7

6

5

V+

OSC

LV