COMS Voltage Converters
CMOS Voltage Converters
ICL7660
The ICL7660 are monolithic CMOS power supply circuits which offer unique performance advantages over
previously available devices. The ICL7660 performs supply voltage conversions from positive to negative for an input
range of +1.5V to +10.0V resulting in complementary output voltages of -1.5V to -10.0V.
Only 2 noncritical external capacitors are needed for the charge pump and charge reservoir functions.
The ICL7660 can also be connected to function as voltage doublers and will generate output voltages up to +18.6V with a
+10V input.
Contained on the chip are a series DC supply regulator, RC oscillator, voltage level translator, and four output power MOS
switches. A unique logic element senses the most negative voltage in the device and ensures that the output N-Channel
switch source-substrate junctions are not forward biased. This assures latchup free operation. 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 overdriven by an external clock.
The “LV” terminal may be tied to GROUND to bypass the internal series regulator and improve low voltage (LV)
operation. At medium to high voltages (+3.5V to +10.0V), the LV pin is left floating to prevent device latchup.
Pinouts
SOP8 DIP 8
TOP VIEW
Features
Simple Conversion of +5V Logic Supply to ±5V Supplies
Simple Voltage Multiplication (V
OUT
= (-) nV
IN
)
Typical Open Circuit Voltage Conversion Efficiency 99.9%
Typical Power Efficiency 98%
Wide Operating Voltage Range
- ICL7660 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V to 10.0V
Easy to Use - Requires Only 2 External Non-Critical Passive
Components
Applications
On Board Negative Supply for Dynamic RAMs
Localized Processor (8080 Type) Negative Supplies
Inexpensive Negative Supplies
Data Acquisition Systems
Pin Description
Name
NC
CAP+
GND
CAP-
V
OUT
LV
OSC
V+
Pin#
1
2
3
4
5
6
7
8
Function
“+” Capacitor Plate
Ground
“-” Capacitor Plate
Output Voltage
Low Supply Voltage
Oscillator
Supply Voltage
Order Information
Part No.
ICL7660CSA
ICL7660CPA
Temp. Range ( )
0 to 70
0 to 70
Package
SOP8
DIP8
1
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