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FEATURES Operates at Supply Voltages from 1.0 V to 30 V Ground Current 100 A Works in Step-Up or Step-Down Mode Very ...
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FEATURES Operates at Supply Voltages from 1.0 V to 30 V Ground Current 100 A Works in Step-Up or Step-Down Mode Very Few External Components Required Low Battery Detector On-Chip User-Adjustable Current Limit Internal 1 A Power Switch Fixed and Adjustable Output Voltage Versions 8-Lead DIP or SO-8 Package APPLICATIONS Single-Cell to 5 V Converters Laptop and Palmtop Computers Pagers Cameras Battery Backup Supplies Cellular Telephones Portable Instruments 4 mA–20 mA Loop Powered Instruments Hand-Held Inventory Computers
Micropower DC–DC Converter Adjustable and Fixed 3.3 V, 5 V, 12 V ADP1073
FUNCTIONAL BLOCK DIAGRAMS
SET
ADP1073
A2 VIN GAIN BLOCK/ ERROR AMP 212mV REFERENCE ILIM SW1 A1 OSCILLATOR DRIVER SW2 AO
COMPARATOR GND FB
ADP1073
SET
ADP1073-3.3 ADP1073-5 ADP1073-12
VIN A2 GAIN BLOCK/ ERROR AMP 212mV REFERENCE A1 OSCILLATOR DRIVER SW2 AO ILIM SW1
GENERAL DESCRIPTION
The ADP1073 is part of a family of step-up/step-down switching
regulators that operates from an input supply voltage of as little as 1.0 V. This extremely low input voltage allows the ADP1073 to be used in applications requiring use of a single cell battery as the primary power source. The ADP1073 can be configured to operate in either step-up or step-down mode but for input voltages greater than 3 V, the ADP1173 is recommended. An auxiliary gain amplifier can serve as a low battery detector or linear
regulator. Quiescent current on the ADP1073-5 is only 100 µA unloaded, making it ideal for systems w...
