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ADP1108AR-33 Datasheet(PDF) 1 Page - Analog Devices |
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ADP1108AR-33 Datasheet(HTML) 1 Page - Analog Devices |
1 / 12 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 Micropower DC-DC Converter Adjustable and Fixed 3.3 V, 5 V, 12 V ADP1108 FUNCTIONAL BLOCK DIAGRAMS SET VIN GAIN BLOCK/ ERROR AMP COMPARATOR SW2 FB GND SW1 AO ILIM OSCILLATOR DRIVER A1 A2 1.245V REFERENCE ADP1108 SET VIN GAIN BLOCK/ ERROR AMP COMPARATOR SW2 SENSE GND SW1 AO ILIM OSCILLATOR DRIVER A1 A2 1.245V REFERENCE ADP1108-3.3 ADP1108-5 ADP1108-12 R2 753k Ω R1 ADP1108-3.3: R1 = 456k Ω ADP1108-5: R1 = 250k Ω ADP1108-12: R1 = 87.4k Ω GENERAL DESCRIPTION The ADP1108 is a highly versatile micropower switch-mode dc-dc converter that operates from an input voltage supply as low as 2.0 V and typically starts up from 1.8 V. The ADP1108 can be programmed into a step-up or step-down dc-to-dc converter with only three external components. The fixed outputs are 3.3 V, 5 V and 12 V. An adjustable version is also available. In step-up mode, supply voltage range is 2.0 V to 12 V, and 30 V in step-down mode. The ADP1108 can deliver 150 mA at 5 V from a 2 AA cell input and 300 mA at 5 V from a 9 V input in step-down mode. Switch current limit can be programmed with a single resistor. For battery operated and power conscious applications, the ADP1108 offers a very low power consumption of less than 110 µA. The auxiliary gain block available in ADP1108 can be used as a low battery detector, linear post regulator, under voltage lockout circuit or error amplifier. FEATURES Operates at Supply Voltages From 2.0 V to 30 V Consumes Only 110 A Supply Current Step-Up or Step-Down Mode Operation Minimum External Components Required Low Battery Detector Comparator On-Chip User-Adjustable Current Limit Internal 1 A Power Switch Fixed or Adjustable Output Voltage Versions 8-Pin DIP or SO-8 Package APPLICATIONS Notebook/Palm Top Computers 3 V to 5 V, 5 V to 12 V Converters 9 V to 5 V, 12 V to 5 V Converters LCD Bias Generators Peripherals and Add-On Cards Battery Backup Supplies Cellular Telephones Portable Instruments One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997 |
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