AIC1660CS [AIC]
Switched-Capacitor Voltage Converter; 开关电容电压转换器
| 型号： | AIC1660CS |
| 厂家： | 
ANALOG INTERGRATIONS CORPORATION |
| 描述： | Switched-Capacitor Voltage Converter |
| 文件： | 总8页 (文件大小：105K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AIC1660
Switched-Capacitor Voltage Converter
n FEATURES
n DESCRIPTION
l Lowest Output Impedance (Typical 35W at
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 (VOUT = 2VIN ),
VIN=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 36mA at VIN=5V).
l High Power Efficiency (Typical 98%)
l Boost Pin for Higher Switching Frequency.
l Improved SCR Latchup Protection.
divided (VOUT = V /2 ), or multiplied (VOUT
=
IN
±nVIN ), 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.
n APPLICATIONS
l RS-232 Power Supplies.
l Handheld Instruments.
l Data Acquisition Systems.
l Supply Splitter, VOUT= ±VIN /2.
l Operational Amplifier Supplies.
l Panel Meter.
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 (VIN
£3V) operation, or be left floating for input voltage
larger than 3V to improve power dissipation.
n TYPICAL APPLICATION CIRCUIT
IN
V
(1.5V to 6V)
1
2
3
8
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.
7
6
Required for
AIC1660
V £3V
IN
+
m
C1
10 F
VOUT=-V
4
IN
5
m
10 F
C2
+
Negative Voltage Converter
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1660T-P4 Oct. 4, 01 TEL: 886-3-5772500 FAX: 886-3-5772510
www.analog.com.tw
1
AIC1660
n ORDERING INFORMATION
AIC1660 CX
ORDER NUMBER
PIN CONFIGURATION
TOP VIEW
PACKAGE TYPE
N: PLASTIC DIP
S: SMALL OUTLINE
AIC1660CN
(PLASTIC DIP)
BOOST
VIN
1
2
3
4
8
7
6
5
OSC
CAP+
GND
CAP-
LV
AIC1660CS
VOUT
(PLASTIC SO)
n ABSOLUTE MAXIMUM RATINGS
Supply Voltage .............………………............……………………....................................................... 6.0V
Input Voltage on Pin 1, 6 and 7 ...……………..........................…………………............. -0.3V ~VIN + 0.3V
Operating Temperature Range ........…………................……………….…….......……........... -40°C~+85°C
Storage Temperature Range..........…………...................……………………........................ -65°C~150°C
n TEST CIRCUIT
S
I
VIN
OSC
LV
BOOST
CAP+
1
8
7
VIN
IL
2
External
Oscillator
+
AIC1660
GND
OSC
C
m
10 F
C1
L
R
3
4
6
5
VOUT
CAP-
VOUT
C2
m
10 F
+
2
AIC1660
n ELECTRICAL CHARACTERISTICS (V =5.0V, T =25°C, OSC=free running,
IN
A
unless otherwise specified.)
PARAMETER
Supply Current
TEST CONDITIONS
RL = ¥
SYMBOL
IS
MIN
TYP
MAX
UNIT
mA
V
36
70
Minimum Supply Voltage
Maximum Supply Voltage
Output Resistance
RL = ¥
VINL
1.5
RL = ¥
VINH
6
V
IL =20mA,
ROUT
35
70
W
FOSC =10KHz
COSC=0
Oscillator Frequency
FOSC
Pin 1 Floating or GND
Pin 1=VIN
10
50
KHz
Power Efficiency
RL= 5K, FOSC=10KHz
RL = ¥
PEFF
96
98
98
%
%
Voltage Conversion Efficiency
VOUTEFF
99.9
n TYPICAL PERFORMANCE CHARACTERISTICS (TA=25°C)
100
50
90
40
30
20
10
0
80
70
60
50
1
2
3
4
5
6
0
10
20
30
40
50
60
70
80
Supply Voltage (V)
Fig. 1 Supply Current vs. Supply Voltage
Load Current (mA)
Fig. 2 Power Efficiency vs. Load Current
3
AIC1660
n TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
2
-5
-4
-3
-2
1
0
-1
-2
0
2
4
6
8
10
12
14
16
-10
0
10
20
30
40
50
60
70
80
Load Current (mA)
Load Current (mA)
Fig. 3 Output Voltage vs. Load Current
Fig. 4 Power Efficiency vs. Load Current (VIN=2V)
35
30
25
20
15
10
5
60
50
40
30
20
IN
PIN 1=V
BOOST MODE
PIN 1=OPEN
10
5
0
1
2
3
4
5
6
10
100
1000
External Capacitor (Pin 7 to GND), COSC (pF1)0000
Supply Voltage, VIN (V)
Fig. 5 Oscillator Frequency vs. Supply Voltage
Fig. 6 Oscillator Frequency vs Value of COSC
450
400
C1=C2=100mF
m
C1=C2=1 F
m
C1=C2=10 F
300
200
100
0
0.1
1
10
100
Oscillation Frequency, FOSC (KHz)
Fig. 7 Output Resistance vs. Oscillation Frequency
4
AIC1660
n BLOCK DIAGRAM
VIN
Voltage
Level
Converter
BOOST
CAP+
Oscillator
÷
2
OSC
LV
VOUT
CAP-
Substrate
Logic
Voltage
Regulator
Network
GND
n PIN DESCRIPTIONS
PIN 1: BOOST- The frequency of oscillator will
PIN 6: LV
- If V is below 3V, LV should be
IN
be
5 times if boost pin is
tied to GND. For V larger than
IN
connected to VIN.
3V, LV can be floating.
PIN 2: CAP+ - To be connected to the positive
side of the flying capacitor.
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 3: GND - Ground
PIN 4: CAP- - To be connected to the negative
side of flying capacitor.
PIN 8: VIN
- Input supply.
PIN 5: VOUT - Negative output voltage, typically
connected to a 10mF capacitor.
5
AIC1660
n APPLICATION EXAMPLES
VIN (1.5V to 6V)
1
2
3
4
8
7
Fig. 8 shows a typical connection, which will
provide a negative supply from an available
positive supply without the need of any external
diodes. The LV pin should be connect to ground
Required for
VIN£3V
AIC1660
+
m
C1
10 F
6
5
VOUT =-VIN
for VIN£3V, or may be “floated“ for VIN>3V
10mF
C2
+
Fig. 8 Negative Voltage Converter
1N4148
VIN (1.5V to 6V)
R1
IOUT
Fig. 9 shows a method of voltage doubling.
Voltage doubling is achieved by simply
rearranging the connection of the two external
capacitors. An external 470KW resistor is
required to ensure the oscillator will start.
1
2
8
7
VOUT=2VIN
(3V to 12V)
W
220
+
C2
m
10 F
+
AIC1660
C1
3
6
5
m
10 F
R2
470K
4
Fig. 9 Voltage Doubling
(3 to 12V)
V
8
1
2
3
An ultra precision voltage divider is shown in Fig.
10. To achieve the 0.002% accuracy as indicated,
the load current should be kept below 100nA.
However, with a slight loss in accuracy, the load
current can be increased.
7
AIC1660
+
6
5
C1
m
10 F
4
£
Required for VIN 3V
±
+
VOUT =VIN/2 0.002%
C2
10 F
£
£
TMIN TA TMAX
IL<100nA
m
Fig. 10 Ultra Precision Voltage Divider
6
AIC1660
n APPLICATION EXAMPLES (Continued)
1
2
3
8
7
VOUT= VBAT/2 (3.0V)
A common need in many systems is to obtain (+)
and (-) supplies from a single battery or power
+
VBAT
supply system. Where current requirements are
low, the circuit shown in Fig. 11 is a simple
solution.
+
(6V)
C1
m
10 F
6
5
£
Required for VBAT 3V
VOUT= -VBAT/2(-3V)
4
AIC1660
C2
m
10 F
+
Output
Common
Fig. 11 Battery Splitter
n PHYSICAL DIMENSIONS
l 8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL
MIN
1.35
0.10
0.33
0.19
4.80
3.80
MAX
1.75
0.25
0.51
0.25
5.00
4.00
A
A1
B
H
E
C
D
E
e
e
1.27(TYP)
A
H
L
5.80
0.40
6.20
1.27
C
B
L
7
AIC1660
l 8 LEAD PLASTIC DIP (unit: mm)
SYMBOL
MIN
0.381
2.92
0.35
0.20
9.01
7.62
6.09
MAX
D
A1
A2
b
—
4.96
0.56
0.36
10.16
8.26
7.12
E1
C
E
D
E
A2
A1
E1
e
C
L
2.54 (TYP)
eB
eB
L
—
10.92
3.81
b
e
2.92
8
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