AIC1660
Switched-Capacitor Voltage Converter
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FEATURES
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DESCRIPTION
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The AIC1660 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 AIC1660 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
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
≤3V)
operation, or be left floating for input voltage
larger than 3V to improve power dissipation.
Required for
V
IN
≤
3V
V
OUT
=-V
IN
+
10
µ
F
C2
Lowest Output Impedance (Typical 35Ω
V
IN
=5V).
Improved Direct Replacement for 7660.
1.5V to 6V Operation.
No External Diode Required.
Simple Conversion of +5V to -5V.
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Low Quiescent Current (Typical 36µA at V
IN
=5V).
High Power Efficiency (Typical 98%)
Boost Pin for Higher Switching Frequency.
Improved SCR Latchup Protection.
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APPLICATIONS
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RS-232 Power Supplies.
Handheld Instruments.
Data Acquisition Systems.
Supply Splitter, V
OUT
=
±V
IN
/2.
Operational Amplifier Supplies.
Panel Meter.
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TYPICAL APPLICATION CIRCUIT
V
IN
(1.5V to 6V)
1
2
10
µ
F
C1
+
3
4
AIC1660
8
7
6
5
The AIC1660 provides performance superior to
previous
designs
by
combining
low
output
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.
Negative Voltage Converter
Analog Integrations Corporation
DS-1660T-P4
Oct. 4, 01
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
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AIC [ ANALOG INTERGRATIONS CORPORATION ]
