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ADP3000AR Datasheet(PDF) 1 Page - Analog Devices |
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ADP3000AR 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 ADP3000 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 Step-Up/Step-Down Fixed 3.3 V, 5 V, 12 V and Adjustable High Frequency Switching Regulator FUNCTIONAL BLOCK DIAGRAM COMPARATOR GAIN BLOCK/ ERROR AMP 400kHz OSCILLATOR DRIVER A1 1.245V REFERENCE R1 R2 ADP3000 SET VIN GND SENSE A0 ILIM SW1 SW2 FEATURES Operates at Supply Voltages from 2 V to 30 V Works in Step-Up or Step-Down Mode Very Few External Components Required High Frequency Operation Up to 400 kHz Low Battery Detector on Chip User Adjustable Current Limit Fixed and Adjustable Output Voltage 8-Pin DIP and SO-8 Package Small Inductors and Capacitors APPLICATIONS Notebook, Palmtop Computers Cellular Telephones Hard Disk Drives Portable Instruments Pagers GENERAL DESCRIPTION The ADP3000 is a versatile step-up/step-down switching regulator that operates from an input supply voltage of 2 V to 12 V in step-up mode and up to 30 V in step-down mode. The ADP3000 operates in Pulse Frequency Mode (PFM) and consumes only 500 µA, making it highly suitable for applica- tions that require low quiescent current. The ADP3000 can deliver an output current of 100 mA at 3 V from a 5 V input in step-down configuration and 180 mA at 3.3 V from a 2 V input in step-up configuration. The auxiliary gain amplifier can be used as a low battery detector, linear regulator undervoltage lockout or error amplifier. The ADP3000 operates at 400 kHz switching frequency. This allows the use of small external components (inductors and capacitors), making the device very suitable for space constrained designs. ADP3000-3.3V 1 2 3 8 4 5 ILIM VIN SW1 FB (SENSE) SW2 GND + 100µF 10V 120 Ω 6.8µH IN5817 C1 100µF 10V VIN 2V–3.2V 3.3V @ 180mA C1, C2: AVX TPS D107 M010R0100 L1: SUMIDA CD43-6R8 Figure 1. Typical Application ADP3000 1 2 3 8 4 5 ILIM VIN SW1 FB SW2 GND C1 100µF 10V RLIM 120 Ω L1 10µH VIN 5V–6V C1, C2: AVX TPS D107 M010R0100 L1: SUMIDA CD43-100 + D1 1N5818 CL 100µF 10V R2 150k Ω 1% R1 110k Ω 1% VOUT 3V 100mA Figure 2. Step-Down Mode Operation |
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