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ADP1173AN-12 데이터시트(PDF) 1 Page - Analog Devices |
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ADP1173AN-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 ADP1173 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 Micropower DC-DC Converter FUNCTIONAL BLOCK DIAGRAMS SET VIN GAIN BLOCK/ ERROR AMP COMPARATOR SW2 FB GND SW1 AO ILIM OSCILLATOR DRIVER A1 A2 1.245V REFERENCE ADP1173 SET VIN GAIN BLOCK/ ERROR AMP COMPARATOR SW2 SENSE GND SW1 AO ILIM OSCILLATOR DRIVER A1 A2 1.245V REFERENCE ADP1173-3.3 ADP1173-5 ADP1173-12 R2 753k Ω R1 ADP1173-3.3: R1 = 456k Ω ADP1173-5: R1 = 250k Ω ADP1173-12: R1 = 87.4k Ω FEATURES Operates From 2.0 V to 30 V Input Voltages Only 110 A Supply Current (Typical) Step-Up or Step-Down Mode Operation Very Few External Components Required Low Battery Detector 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 and Palmtop Computers Cellular Telephones Flash Memory Vpp Generators 3 V to 5 V, 5 V to 12 V Converters 9 V to 5 V, 12 V to 5 V Converters Portable Instruments LCD Bias Generators GENERAL DESCRIPTION The ADP1173 is part of a family of step-up/step-down switching regulators that operates from an input supply voltage of as little as 2 V to 12 V in step-up mode and to 30 V in step-down mode. The ADP1173 consumes as little as 110 µA in standby mode, making it ideal for applications that need low quiescent current. An auxiliary gain amplifier can serve as a low battery detector, linear regulator (under voltage lockout) or error amplifier. The ADP1173 can deliver 80 mA at 5 V from a 3 V input in step-up configuration or 100 mA at 5 V from a 12 V input in step-down configuration. For input voltages of less than 2 V use the ADP1073. |
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