PRELIMINARY TECHNICAL DATA
a
Preliminary Technical Data
FEATURES 1 MHz PWM Frequency Automatic PWM to Power Saving Mode...
PRELIMINARY TECHNICAL DATA
a
Preliminary Technical Data
FEATURES 1 MHz PWM Frequency Automatic PWM to Power Saving Mode at Light Load Fully Integrated 1 A Power Switch 3% Output Regulation Accuracy over Temperature, Line, and Load 100% Duty Cycle Operation Simple Compensation Output Voltage: 1.25 V to 10.5 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 GENERAL DESCRIPTION
IN IN
1 MHz, 750 mA Buck
Regulator ADP3088
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
The ADP3088 is a high frequency, non-synchronous PWM step-down DC-DC
regulator with an integrated 1A power switch in a space-saving MSOP8 package. It provides high efficiency, excellent dynamic response, and is very simple to use. The ADP3088’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 11 V input, it is...