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ADP1110AR Datasheet(PDF) 1 Page - Analog Devices |
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ADP1110AR Datasheet(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 ADP1110 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., 1996 Micropower, Step-Up/Step-Down Switching Regulator; Adjustable and Fixed 3.3 V, 5 V, 12 V FUNCTIONAL BLOCK DIAGRAMS SENSE A0 DRIVER ILIM SW1 SW2 VIN SET 220mV REFERENCE GAIN BLOCK/ ERROR AMP A2 A1 Q1 OSCILLATOR ADP1110 GND COMPARATOR R1 R2 300k Ω ADP1110 Block Diagram—Fixed Output Version A0 DRIVER ILIM SW1 SW2 VIN GND SET 220mV REFERENCE GAIN BLOCK/ ERROR AMP COMPARATOR FB A2 A1 Q1 OSCILLATOR ADP1110 ADP1110 Block Diagram—Adjustable Output Version FEATURES Operates at Supply Voltages From 1.0 V to 30 V Step-Up or Step-Down Mode Minimal External Components Required Low-Battery Detector User-Adjustable Current Limiting Fixed or Adjustable Output Voltage Versions 8-Pin DIP or SO-8 Package 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 ADP1110 is part of a family of step-up/step-down switch- ing regulators that operate from an input voltage supply as little as 1.0 V. This very low input voltage allows the ADP1110 to be used in applications that use a single cell as the primary power source. The ADP1110 can be configured to operate in either step-up or step-down mode, but for input voltages greater than 3 V, the ADP1111 would be a more effective solution. An auxiliary gain amplifier can serve as a low battery detector or as a linear regulator. The quiescent current of 300 µA makes the ADP1110 useful in remote or battery powered applications. The 70 kHz frequency operation also allows for the use of surface-mount external capacitors and inductors. Battery protection circuitry limits the effect of reverse current to safe levels at reverse voltages up to 1.6 V. |
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