ADM660 반도체 회로 부품 판매점
CMOS Switched-Capacitor Voltage Converters
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 Analog Devices |
CMOS Switched-Capacitor
Voltage Converters
ADM660/ADM8660
FEATURES
ADM660: Inverts or Doubles Input Supply Voltage
ADM8660: Inverts Input Supply Voltage
100 mA Output Current
Shutdown Function (ADM8660)
2.2 F or 10 F Capacitors
0.3 V Drop at 30 mA Load
+1.5 V to +7 V Supply
Low Power CMOS: 600 A Quiescent Current
Selectable Charge Pump Frequency (25 kHz/120 kHz)
Pin Compatible Upgrade for MAX660, MAX665, ICL7660
Available in 16-Lead TSSOP Package
APPLICATIONS
Handheld Instruments
Portable Computers
Remote Data Acquisition
Op Amp Power Supplies
GENERAL DESCRIPTION
The ADM660/ADM8660 is a charge-pump voltage converter
that can be used to either invert the input supply voltage giving
VOUT = –VIN or double it (ADM660 only) giving VOUT = 2 ϫ VIN.
Input voltages ranging from +1.5 V to +7 V can be inverted into
a negative –1.5 V to –7 V output supply. This inverting scheme
is ideal for generating a negative rail in single power supply
systems. Only two small external capacitors are needed for the
charge pump. Output currents up to 50 mA with greater than
90% efficiency are achievable, while 100 mA achieves greater
than 80% efficiency.
A Frequency Control (FC) input pin is used to select either
25 kHz or 120 kHz charge-pump operation. This is used to
optimize capacitor size and quiescent current. With 25 kHz
selected, a 10 µF external capacitor is suitable, while with 120 kHz
the capacitor may be reduced to 2.2 µF. The oscillator frequency
on the ADM660 can also be controlled with an external capacitor
connected to the OSC input or by driving this input with an
external clock. In applications where a higher supply voltage is
desired it is possible to use the ADM660 to double the input
voltage. With input voltages from 2.5 V to 7 V, output voltages
from 5 V to 14 V are achievable with up to 100 mA output current.
The ADM8660 features a low power shutdown (SD) pin instead
of the external oscillator (OSC) pin. This can be used to disable
the device and reduce the quiescent current to 300 nA.
TYPICAL CIRCUIT CONFIGURATIONS
+1.5V TO +7V
INPUT
C1 +
10F
FC V+
ADM660
CAP+
OSC
GND
LV
CAP–
OUT
C2
+10F
INVERTED
NEGATIVE
OUTPUT
Voltage Inverter Configuration (ADM660)
C1 +
10F
SHUTDOWN
CONTROL
+1.5V TO +7V
INPUT
FC ADM8660
CAP+
GND
V+
LV
CAP–
OUT
SD
C2
+10F
INVERTED
NEGATIVE
OUTPUT
Voltage Inverter Configuration with Shutdown (ADM8660)
The ADM660 is a pin compatible upgrade for the MAX660,
MAX665, ICL7660, and LTC1046.
The ADM660/ADM8660 is available in 8-lead DIP and
narrow-body SOIC. The ADM660 is also available in a 16-lead
TSSOP package.
ADM660/ADM8660 Options
Option
ADM660
ADM8660
Inverting Mode
Doubling Mode
External Oscillator
Shutdown
Package Options
R-8
N-8
RU-16
Y
Y
Y
N
Y
Y
Y
Y
N
N
Y
Y
Y
N
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax:781/461-3113 ©2011 Analog Devices, Inc. All rights reserved.
ADM660/ADM8660–SPECIFICATIONS (V+ = +5 V, C1, C2 = 10F,* TA = TMINto TMAX, unless
otherwise noted.)
Parameter
Input Voltage, V+
Supply Current
Output Current
Output Resistance (ADM660)
Output Resistance (ADM8660)
Output Resistance (ADM8660)
Charge-Pump Frequency
OSC Input Current
Power Efficiency (FC = Open) (ADM660)
Power Efficiency (FC = Open) (ADM8660)
Power Efficiency (FC = Open) (ADM8660)
Min Typ Max Unit
3.5 7.0 V
1.5 7.0 V
2.5 7.0 V
0.6 1
2.5 4.5
100
9
9
15
15
16.5
25
120
±5
± 25
90 94
90 94
88.5
mA
mA
mA
W
W
W
kHz
kHz
mA
mA
%
%
%
Power Efficiency (FC = Open) (ADM660)
Power Efficiency (FC = Open) (ADM8660)
Power Efficiency (FC = Open) (ADM8660)
Power Efficiency (FC = Open)
Voltage Conversion Efficiency
Shutdown Supply Current, ISHDN
Shutdown Input Voltage, VSHDN
Shutdown Exit Time
*C1 and C2 are low ESR (<0.2 W) electrolytic capacitors.
High ESR degrade performance.
Specifications subject to change without notice.
90 93
90 93
88.5
81.5
99 99.96
0.3 5
2.4
0.8
500
%
%
%
%
%
mA
V
V
ms
Test Conditions/Comments
RL = 1 kW
Inverting Mode, LV = Open
Inverting Mode, LV = GND
Doubling Mode, LV = OUT
No Load
FC = Open (ADM660), GND (ADM8660)
FC = V+, LV = Open
IL = 100 mA
IL = 100 mA, TA = 25∞C
IL = 100 mA, TA = –40∞C to +85∞C
FC = Open (ADM660), GND (ADM8660)
FC = V+
FC = Open (ADM660), GND (ADM8660)
FC = V+
RL = 1 kW Connected from V+ to OUT
RL = 1 kW Connected from V+ to OUT,
TA = +25∞C
RL = 1 kW Connected from V+ to OUT,
TA = –40∞C to +85∞C
RL = 500 W Connected from OUT to GND
RL = 500 W Connected from OUT to GND,
TA = +25∞C
RL = 500 W Connected from OUT to GND,
TA = –40∞C to +85∞C
IL = 100 mA to GND
No Load
ADM8660, SHDN = V+
SHDN High = Disabled
SHDN Low = Enabled
IL = 100 mA
–2– REV. C
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