DATASHEET
ICL7660S, ICL7660A
Super Voltage Converters
FN3179
Rev 7.01
Feb 10, 2020
The ICL7660S and ICL7660A Super Voltage Converters are
monolithic CMOS voltage conversion ICs that ensure
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
ensured over the entire commercial and industrial
temperature ranges.
Features
• Ensured 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
• Ensured Minimum Power Efficiency of 96%
• Improved Minimum Open Circuit Voltage Conversion
Efficiency of 99%
• Improved SCR Latchup Protection
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.
• Simple Conversion of +5V Logic Supply to ±5V Supplies
• Simple Voltage Multiplication V
= (-)nV
IN
OUT
• 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)
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.
Applications
• Simple Conversion of +5V to ±5V Supplies
• Voltage Multiplication V
= ±nV
IN
OUT
• Negative Supplies for Data Acquisition Systems and
Instrumentation
• RS232 Power Supplies
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.
• Supply Splitter, V
= ±V
S
OUT
In some applications, an external Schottky diode from V
OUT
to CAP- is needed to ensure latchup free operation (see Do’s
and Dont’s section on page 8).
Pin Configurations
ICL7660S
(8 LD PDIP, SOIC)
TOP VIEW
ICL7660A
(8 LD PDIP, SOIC)
TOP VIEW
BOOST
CAP+
GND
1
2
3
4
8
7
6
5
V+
NC
CAP+
GND
1
2
3
4
8
7
6
5
V+
OSC
LV
OSC
LV
CAP-
V
CAP-
V
OUT
OUT
FN3179 Rev 7.01
Feb 10, 2020
Page 1 of 14
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