AIC7660
Switched-Capacitor Voltage Converter
FEATURES
Lowest Output Impedance (Typical 35Ω at
V
IN
=5V).
Improved Direct Replacement for the Popular
7660.
1.5V to 6V Operation.
No External Diode Required.
Simple Conversion of +5V to -5V.
Low Quiescent Current (Typical 36µA at V
IN
=5V).
High Power Efficiency (Typical 98%)
Boost Pin for Higher Switching Frequency.
Improved SCR Latch-up Protection.
DESCRIPTION
The AIC7660 is a monolithic CMOS switched
capacitor voltage converter. Designed to be an
improved direct replacement for the popular 7660
and LTC1044, the main function of the AIC7660
is to convert a positive input voltage in the range
of 1.5V to 6V to the corresponding negative
output voltage in the range of -1.5V to -6V. The
input voltage can also be doubled (V
OUT
= 2V
IN
),
divided (V
OUT
= V
IN
/2), or multiplied (V
OUT
=
±nV
IN
), as shown in application examples.
The chip contains a series DC power supply
APPLICATIONS
RS-232 Power Supplies.
Handheld Instruments.
Data Acquisition Systems.
Supply Splitter, V
OUT
=
±V
IN
/2.
Operational Amplifier Supplies.
Panel Meter.
regulator, oscillator, control circuitry and four
output power MOS switches. The frequency of
oscillator can be lowered by the addition of an
external capacitor to the OSC pin, or the
oscillator may be over-driven by an external
clock.
The boost function is available to raise the
oscillator frequency to optimize performance in
specific applications. The “LV” terminal may be
tied to GND to improve low input voltage (V
IN
≤3.0V)
operation, or be left floating for input
TYPICAL APPLICATION CIRCUIT
1
BOOST
2
CAP+
GND
CAP-
VIN
OSC
LV
8
7
6
V
IN=
5V
voltage larger than 3.0V to improve power
dissipation.
The AIC7660 provides performance superior to
previous designs by combining low output
10µF
C1
+
3
4
VOUT
5
V
OUT
=-5V
+
10µF
C2
impedance, low quiescent current with high
efficiency, and by eliminating diode drop voltage
losses. The only required external components
are two low cost electrolytic capacitors.
AIC7660
Negative Voltage Converter
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
DS-7660P-01
112206
1
AIC [ ANALOG INTERGRATIONS CORPORATION ]
