S E M I C O N D U C T O R
ICL7662
CMOS Voltage Converter
Description
The Harris ICL7662 is a monolithic high-voltage CMOS
power supply circuit which offers unique performance ad-
vantages over previously available devices. The ICL7662
performs supply voltage conversion from positive to negative
for an input range of +4.5V to +20.0V, resulting in comple-
mentary output voltages of -4.5V to -20V. Only 2 noncritical
external capacitors are needed for the charge pump and
charge reservoir functions. The ICL7662 can also function
as a voltage doubler, and will generate output voltages up to
+38.6V with a +20V input.
Contained on chip are a series DC power supply regulator,
RC oscillator, voltage level translator, 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 fre-
quency of 10kHz for an input supply voltage of 15.0V. This
frequency can be lowered by the addition of an external
capacitor to the 鈥淥SC鈥?terminal, or the oscillator may be
overdriven by an external clock.
The 鈥淟V鈥?terminal may be tied to GROUND to bypass the
internal series regulator and improve low voltage (LV) opera-
tion. At medium to high voltages (+10V to +20V), the LV pin
is left 鏗俹ating to prevent device latchup.
April 1994
Features
鈥?No External Diode Needed Over Entire Temperature
Range
鈥?Pin Compatible With ICL7660
鈥?Simple Conversion of +15V Supply to -15V Supply
鈥?Simple Voltage Multiplication (V
OUT
= (-)nV
IN
)
鈥?99.9% Typical Open Circuit Voltage Conversion
Ef鏗乧iency
鈥?96% Typical Power Ef鏗乧iency
鈥?Wide Operating Voltage Range 4.5V to 20.0V
鈥?Easy to Use - Requires Only 2 External Non-Critical
Passive Components
Applications
鈥?On Board Negative Supply for Dynamic RAMs
鈥?Localized
碌Processor
(8080 Type) Negative Supplies
鈥?Inexpensive Negative Supplies
鈥?Data Acquisition Systems
鈥?Up to -20V for Op Amps
Pinouts
ICL7662 (PDIP)
TOP VIEW
TEST
CAP+
GND
CAP-
1
2
3
4
8
7
6
5
V+
OSC
LV
V
OUT
ICL7662CBD AND IBD (SOIC)
TOP VIEW
NC 1
TEST 2
NC 3
CAP+ 4
GND 5
14 V+
13 NC
12 OSC
11 LV
10 NC
GND
NC 6
NC 7
9 V
OUT
8 CAP-
CAP+
2
TEST
ICL7662 (CAN)
TOP VIEW
V+
8
1
7
OSC
6
LV
ICL7662CBD-0 (SOIC)
TOP VIEW
TEST 1
NC 2
CAP+ 3
NC 4
GND 5
NC 6
CAP- 7
14 V+
13 OSC
12 NC
11 LV
10 NC
9 NC
8 V
OUT
3
4
5
V
OUT
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.
Copyright
漏
Harris Corporation 1994
File Number
3181.2
7-216
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