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ADM8660AR Fiches technique(PDF) 1 Page - Analog Devices |
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ADM8660AR Fiches technique(HTML) 1 Page - Analog Devices |
1 / 12 page REV. B 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: 781/326-8703 © 2002 Analog Devices, Inc. All rights reserved. ADM660/ADM8660 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 CONFIGURATIONS + + +1.5V TO +7V INPUT C1 10 F C2 10 F INVERTED NEGATIVE OUTPUT ADM660 FC CAP+ GND CAP– V+ OSC LV OUT Voltage Inverter Configuration (ADM660) + + +1.5V TO +7V INPUT C1 10 F C2 10 F INVERTED NEGATIVE OUTPUT ADM8660 FC CAP+ GND CAP– V+ LV OUT SD SHUTDOWN CONTROL Voltage Inverter Configuration with Shutdown (ADM8660) 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 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. 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 Y Y Doubling Mode Y N External Oscillator Y N Shutdown N Y Package Options R-8 Y Y N-8 Y Y RU-16 Y N |
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