AIC1660
Switched-Capacitor Voltage Converter
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
www.analog.com.tw
DS-1660T-P4 Oct. 4, 01
TEL: 886-3-5772500 FAX: 886-3-5772510
1
n
FEATURES
l
Lowest Output Impedance (Typical 35
at
V
IN
=5V).
l
Improved Direct Replacement for 7660.
l
1.5V to 6V Operation.
l
No External Diode Required.
l
Simple Conversion of +5V to -5V.
l
Low Quiescent Current (Typical 36
µ
A at V
IN
=5V).
l
High Power Efficiency (Typical 98%)
l
Boost Pin for Higher Switching Frequency.
l
Improved SCR Latchup Protection.
n
APPLICATIONS
l
RS-232 Power Supplies.
l
Handheld Instruments.
l
Data Acquisition Systems.
l
Supply Splitter, V
OUT
=
±
V
IN
/2.
l
Operational Amplifier Supplies.
l
Panel Meter.
n
TYPICAL APPLICATION CIRCUIT
10
µ
F
C1
V
OUT
=-V
IN
V
IN
(1.5V to 6V)
Required for
V
IN
3V
1
8
AIC1660
7
6
5
4
3
2
+
+
10
µ
F
C2
Negative Voltage Converter
n
DESCRIPTION
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.
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.
AIC1660
2
n
ORDERING INFORMATION
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
ORDER NUMBER
PIN CONFIGURATION
AIC1660CN
(PLASTIC DIP)
AIC1660CS
(PLASTIC SO)
TOP VIEW
1
3
4
2
8
6
5
7
LV
VIN
CAP+
GND
CAP-
OSC
VOUT
BOOST
AIC1660 CX
n
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ................ ... ... ... ... ... ............... ... ... ... ... ... ... ... ....................................................... 6.0V
Input Voltage on Pin 1, 6 and 7 ...... ... ... ... ... ............................. ... ... ... ... ... ... ............. -0.3V ~V
IN
+ 0.3V
Operating Temperature Range ........... ... ... ... ................... ... ... ... ... ... .... ... .......... ... ........... -40
°
C~+85
°
C
Storage Temperature Range............. ... ... ... ...................... ... ... ... ... ... ... ... ........................ -65
°
C~150
°
C
n
TEST CIRCUIT
R
L
I
L
+
V
OUT
Oscillator
External
C
OSC
AIC1660
VIN
OSC
LV
VOUT
CAP-
GND
8
7
6
5
CAP+
BOOST
1
4
3
2
+
I
S
10
µ
F
V
IN
C2
10
µ
F
C1
AIC1660
3
n
ELECTRICAL CHARACTERISTICS
(V
IN
=5.0V, T
A
=25
°
C, OSC=free running,
unless otherwise specified.)
PARAMETER
TEST CONDITIONS
SYMBOL
MIN
TYP
MAX
UNIT
Supply Current
R
L
=
I
S
36
70
µ
A
Minimum Supply Voltage
R
L
=
V
INL
1.5
V
Maximum Supply Voltage
R
L
=
V
INH
6
V
Output Resistance
I
L
=20mA,
F
OSC
=10KHz
R
OUT
35
70
Oscillator Frequency
C
OSC
=0
Pin 1 Floating or GND
Pin 1=V
IN
F
OSC
10
50
KHz
Power Efficiency
R
L
= 5K, F
OSC
=10KHz
P
EFF
96
98
%
Voltage Conversion Efficiency
R
L
=
V
OUTEFF
98
99.9
%
n
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
=25
°
C)
1
2
3
4
5
6
0
10
20
30
40
50
Supply Current (
µ
A)
Supply Voltage (V)
Fig. 1 Supply Current vs. Supply Voltage
Load Current (mA)
Fig. 2 Power Efficiency vs. Load Current
Power Efficiency (%)
0
10
20
30
40
50
60
70
80
50
60
70
80
90
100
AIC1660
4
n
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
Fig. 3 Output Voltage vs. Load Current
Output Voltage (V)
-10
0
10
20
30
40
50
60
70
80
-2
-3
-4
-5
Load Current (mA)
0
2
4
6
8
10
12
14
16
-2
-1
0
1
2
Output Voltage (V)
Load Current (mA)
Fig. 4 Power Efficiency vs. Load Current (V
IN
=2V)
Fig. 5 Oscillator Frequency vs. Supply Voltage
Oscillation Frequency, F
OSC
(
KHz)
Supply Voltage, V
IN
(V)
1
2
3
4
5
6
5
10
20
30
40
50
60
BOOST MODE
Fig. 6 Oscillator Frequency vs Value of C
OSC
Oscillation Frequency, F
OSC
(
KHz)
External Capacitor (Pin 7 to GND), C
OSC
(pF)
10
100
1000
10000
0
5
10
15
20
25
30
35
PIN 1=OPEN
PIN 1=V
IN
Output Resistance R
OUT
(
)
Oscillation Frequency, F
OSC
(KHz)
0.1
1
10
100
0
100
200
300
400
450
Fig. 7 Output Resistance vs. Oscillation Frequency
C1=C2=100
µ
F
C1=C2=10
µ
F
C1=C2=1
µ
F
AIC1660
5
n
BLOCK DIAGRAM
÷
2
VIN
CAP+
VOUT
CAP-
GND
LV
OSC
BOOST
Regulator
Voltage
Substrate
Logic
Network
Voltage
Level
Converter
Oscillator
n
PIN DESCRIPTIONS
PIN 1: BOOST- The frequency of oscillator will
be 5 times if boost pin is
connected to V
IN
.
PIN 2: CAP+ - To be connected to the positive
side of the flying capacitor.
PIN 3: GND
- Ground
PIN 4: CAP-
- To be connected to the negative
side of flying capacitor.
PIN 5: VOUT - Negative output voltage, typically
connected to a 10
µ
F capacitor.
PIN 6: LV
- If V
IN
is below 3V, LV should be
tied to GND. For V
IN
larger than
3V, LV can be floating.
PIN 7: OSC
- 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.
PIN 8: VIN
- Input supply.
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