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ADM8660ARZ
CMOS Switched-Capacitor Voltage Converter w/ Low Power Shutdown Pin
REV.B
CMOS Switched-Capacitor
Voltage Converters
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
TYPICAL CIRCUIT CONFIGURATIONSVoltage Inverter Configuration (ADM660)
Voltage Inverter Configuration with Shutdown (ADM8660)
GENERAL DESCRIPTIONThe 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 � 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 120kHz
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 300nA.
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
ADM660/ADM8660–SPECIFICATIONSOutput Current
Output Resistance (ADM660)
Output Resistance (ADM8660)
Power Efficiency (FC = Open) (ADM8660)
Power Efficiency (FC = Open) (ADM8660)
Power Efficiency (FC = Open) (ADM8660)
Power Efficiency (FC = Open) (ADM8660)
Shutdown Input Voltage, VSHDN
*C1 and C2 are low ESR (<0.2 W) electrolytic capacitors.
High ESR degrade performance.
Specifications subject to change without notice.
(V+ = +5 V, C1, C2 = 10�F,* TA = TMIN to TMAX, unless
otherwise noted.)
Power Dissipation, RU-16 . . . . . . . . . . . . . . . . . . . . . 500 mW
(Derate 6 mW/°C above +50°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . 158°C/W
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering10sec) . . . . . . . . +300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >2000 V
*This is a stress rating only; functional operation of the device at these or any other
conditions above those indicated in the operation section of this specification is not
implied. Exposure to absolute maximum rating conditions for extended periods
may affect device reliability.
ABSOLUTE MAXIMUM RATINGS*(TA = +25°C, unless otherwise noted.)
InputVoltage (V+ to GND, GND to OUT) . . . . . . . . +7.5 V
LV Input Voltage . . . . . . . . . . (OUT – 0.3 V) to (V+, +0.3 V)
FC and OSC Input Voltage
. . . . . . . . . . . (OUT – 0.3 V) or (V+, –6 V) to (V+, +0.3 V)
OUT, V+ Output Current (Continuous) . . . . . . . . . . . 120 mA
Output Short Circuit Duration to GND . . . . . . . . . . . 10 secs
Power Dissipation, N-8 . . . . . . . . . . . . . . . . . . . . . . . 625 mW
(Derate 8.3 mW/°C above +50°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . 120°C/W
Power Dissipation, R-8 . . . . . . . . . . . . . . . . . . . . . . . 450 mW
(Derate 6 mW/°C above +50°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . . 170°C/W
ORDERING GUIDE*N = Plastic DIP; RU = Thin Shrink Small Outline; RN = Small Outline.
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
ADM660/ADM8660 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
ADM660/ADM8660
Doubler Configuration (ADM660 Only)
PIN CONNECTIONS
8-Lead
16-Lead
Inverter Configuration
PIN FUNCTION DESCRIPTIONS
TPC 1.Power Supply Current vs. Voltage
TPC 2.Output Voltage and Efficiency vs. Load Current
TPC 3.Output Voltage Drop vs. Load Current
TPC 4.Efficiency vs. Charge-Pump Frequency
TPC 5.Power Supply Current vs. Charge-Pump
Frequency
TPC 6.Power Efficiency vs. Load Current
ADM660/ADM8660TPC 7.Output Voltage vs. Charge-Pump Frequency
TPC 8.Output Source Resistance vs. Supply Voltage
TPC 9.Charge-Pump Frequency vs. Supply Voltage
TPC 10.Charge-Pump Frequency vs. Temperature
TPC 11.Charge-Pump Frequency vs. External
Capacitance
TPC 12.Charge-Pump Frequency vs. Supply Voltage
