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ADP1073AR-12 데이터시트(PDF) 1 Page - Analog Devices |
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ADP1073AR-12 데이터시트(HTML) 1 Page - Analog Devices |
1 / 16 page REV. 0 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 ADP1073 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., 1997 Micropower DC–DC Converter Adjustable and Fixed 3.3 V, 5 V, 12 V FUNCTIONAL BLOCK DIAGRAMS SET VIN GAIN BLOCK/ ERROR AMP COMPARATOR SW2 FB GND SW1 AO ILIM OSCILLATOR DRIVER A1 A2 212mV REFERENCE ADP1073 ADP1073 SET VIN GAIN BLOCK/ ERROR AMP COMPARATOR SW2 SENSE GND SW1 AO ILIM OSCILLATOR DRIVER A1 A2 212mV REFERENCE ADP1073-3.3 ADP1073-5 ADP1073-12 R2 904k R1 ADP1073-3.3: R1 = 62.1k ADP1073-5: R1 = 40k ADP1073-12: R1 = 16.3k ADP1073-3.3, 5, 12 FEATURES Operates at Supply Voltages from 1.0 V to 30 V Ground Current 100 A Works in Step-Up or Step-Down Mode Very Few External Components Required Low Battery Detector On-Chip User-Adjustable Current Limit Internal 1 A Power Switch Fixed and Adjustable Output Voltage Versions 8-Lead DIP or SO-8 Package APPLICATIONS Single-Cell to 5 V Converters Laptop and Palmtop Computers Pagers Cameras Battery Backup Supplies Cellular Telephones Portable Instruments 4 mA–20 mA Loop Powered Instruments Hand-Held Inventory Computers GENERAL DESCRIPTION The ADP1073 is part of a family of step-up/step-down switch- ing regulators that operates from an input supply voltage of as little as 1.0 V. This extremely low input voltage allows the ADP1073 to be used in applications requiring use of a single cell battery as the primary power source. The ADP1073 can be configured to operate in either step-up or step-down mode but for input voltages greater than 3 V, the ADP1173 is recommended. An auxiliary gain amplifier can serve as a low battery detector or linear regulator. Quiescent current on the ADP1073-5 is only 100 µA unloaded, making it ideal for systems where long battery life is required. The ADP1073 can deliver 40 mA at 5 V from an input voltage range as low as 1.25 V, or 10 mA at 5 V from a 1.0 V input. Current limiting is available by adding an external resistor. |
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