ADP3089

PRELIMINARY TECHNICAL DATA a Preliminary Technical Data FEATURES 1 MHz PWM Frequency Ultrasmall 8-lead 3×3 Sq. mm Chip Scale Package Automatic PWM to Power Saving Mode at Light Load Fully Integrated 1.5 A Power Switch 3% Output Regulation Accuracy over Temperature, Line, and Load 100% Duty Cycle Operation www.DataSheet4U.com Simple Compensation Output Voltage: 1.25 V to 11.5 V Input Voltage: up to 12 V Small Inductor and MLC Capacitors Low Quiescent Current while Pulse Skipping Thermal Shutdown Fully Integrated Soft Start Cycle-by-cycle Current Limit APPLICATONS PDAs and Palmtop Computers Notebook Computers PCMCIA Cards Bus Products Portable Instruments Industrial Systems GENERAL DESCRIPTION IN IN 1 MHz, 1 A Buck Regulator ADP3089 FUNCTIONAL BLOCK DIAGRAM SW CURRENT SENSE PWM 1MHz AMP COMPARATOR S Q R DRV PROTECTION LOGIC (ILIM, OT) ERROR AMP gm RUN/STOP COMPARATORS FB SOFT-START TIMER COMP GND GND + REF 1.245V VIN 10µF 0.1µF IN IN ADP3089 SW SW DRV FB 10µH 1N5817 53.6kΩ + 10µF 120kΩ VOUT 1.8V@1A The ADP3089 is a high frequency, non-synchronous PWM step-down DC-DC regulator with an integrated 1.5 A power switch in a space-saving chip scale package. It provides high efficiency, excellent dynamic response, and is very simple to use. The ADP3089’s 1 MHz switching frequency allows for small, inexpensive external components, and the current mode control loop is simple to compensate and eases noise filtering. It operates in PWM current mode under heavy loads and saves e...