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ADP1109AAR-12 Datasheet(PDF) 1 Page - Analog Devices |
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ADP1109AAR-12 Datasheet(HTML) 1 Page - Analog Devices |
1 / 8 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 ADP1109A 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 Low Cost Fixed 3.3 V, 5 V, 12 V and Adjustable DC-to-DC Converter FUNCTIONAL BLOCK DIAGRAM 120kHz OSCILLATOR ADP1109A-3.3: R1 = 152k ADP1109A-5: R1 = 83k ADP1109A-12: R1 = 29k VIN SENSE SW PGND SHUTDOWN GND 1.25V REFERENCE R2 250k R1 DRIVER COMPARATOR Q1 A1 120kHz OSCILLATOR ADP1109A VIN FB SW PGND SHUTDOWN GND 1.25V REFERENCE DRIVER COMPARATOR Q1 A1 FEATURES Operates at Supply Voltages 2 V to 9 V Fixed 3.3 V, 5 V, 12 V and Adjustable Output Minimum External Components Required Ground Current: 460 A Oscillator Frequency: 120 kHz Logic Shutdown 8-Lead DIP and SO-8 Packages APPLICATIONS Cellular Telephones Single-Cell to 5 V Converters Laptop and Palmtop Computers Pagers Cameras Battery Backup Supplies Portable Instruments Laser Diode Drivers Hand-Held Inventory Computers GENERAL DESCRIPTION The ADP1109A is a versatile step-up switching regulator. The device requires only minimal external components to operate as a complete switching regulator. The ADP1109A-5 can deliver 100 mA at 5 V from a 3 V input and the ADP1109A-12 can deliver 60 mA at 12 V from a 5 V input. The device also features a logic controlled shutdown capability that, when a logic low is applied, will shut down the oscillator. The 120 kHz operating frequency allows for the use of small surface mount components. The gated oscillator capability eliminates the need for frequency compensation. TYPICAL APPLICATION 7 8 1 3 4 5 L1 33 H D1 VOUT 12V 60mA C1 22 F 16V SHUTDOWN PGND GND VIN SW SENSE ADP1109A-12 VIN 5V SHUTDOWN/PROGRAM + Flash Memory VPP Generator |
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