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ADM8828ART Datasheet(PDF) 1 Page - Analog Devices |
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ADM8828ART Datasheet(HTML) 1 Page - Analog Devices |
1 / 6 page REV. A 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a ADM8828/ADM8829 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 Switched-Capacitor Voltage Inverter with Shutdown FUNCTIONAL BLOCK DIAGRAMS TOP VIEW (Not to Scale) OUT IN CAP– CAP+ SHDN GND ADM8828 1 2 3 6 5 4 TOP VIEW (Not to Scale) OUT IN CAP+ NC GND ADM8829 1 2 3 6 5 4 CAP– NC = NO CONNECT FEATURES Inverts Input Supply Voltage 99% Voltage Conversion Efficiency 25 mA Output Current Shutdown Function Requires Only Two Capacitors 1 F Capacitors 18 Output Resistance +1.5 V to +5.5 V Input Range 600 A Quiescent Current 20 nA Shutdown Current (ADM8828) APPLICATIONS Handheld Instruments LCD Panels Cellular Phones PDAs Remote Data Acquisition Op Amp Power Supplies GENERAL DESCRIPTION The ADM8828/ADM8829 is a charge-pump voltage inverter which may be used to generate a negative supply from a positive input. Input voltages ranging from +1.5 V to +5.5 V can be inverted into a negative –1.5 V to –5.5 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 25 mA with greater than 99% efficiency are achievable. The ADM8828 also features a low power shutdown (SHDN) pin. This can be used to disable the device and reduce the quies- cent current to 20 nA. The ADM8828/ADM8829 is available in a 6-lead SOT-23 package. + + +1.5V TO +5.5V INPUT SHUTDOWN CONTROL C1 1 F C2 1 F INVERTED NEGATIVE OUTPUT ADM8828/ ADM8829 CAP+ CAP– GND IN SHDN OUT Figure 1. Typical Circuit Configuration |
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