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ADP3089

Analog Devices
Part Number ADP3089
Manufacturer Analog Devices
Description 1A Buck Regulator
Published Jun 2, 2008
Detailed Description PRELIMINARY TECHNICAL DATA a Preliminary Technical Data FEATURES 1 MHz PWM Frequency Ultrasmall 8-lead 3×3 Sq. mm Chip ...
Datasheet PDF File ADP3089 PDF File

ADP3089
ADP3089

Overview
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 energy at lighter loads by switching automatically into Power Saving mode.
Soft start is integrated completely on chip, as is the cycle-by-cycle current limit.
Capable of operating from 2.
5 V to 12 V input with a typical output current of 1 A, it is ideal for portable, battery powered, industrial, PC and instrumentation applications.
Supporting output voltages down to 1.
25 V, the ADP3089 is ideal to generate low voltage rails, providing the optimal solution in its class for delivering power effic...


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