ADP3089 查看數據表（PDF） - Analog Devices
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ADP3089 Datasheet PDF : 4 Pages
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PRELIMINARY TECHNICAL DATA
a
1 MHz, 1 A Buck Regulator
Preliminary Technical Data
ADP3089
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
Simple Compensation
Output Voltage: 1.25 V to 10 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
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 pro-
vides 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 auto-
matically 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 with a
typical output current of 1 A, it is ideal for portable, bat-
tery powered, industrial, PC and instrumentation applica-
tions. 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 effi-
ciently, responsively, and simply with minimal printed
circuit board area.
The device is specified over the industrial temperature
range of -40°C to +85°C, and is offered in an ultrasmall 8-
lead 3×3 square mm chip scale package.
FUNCTIONAL BLOCK DIAGRAM
IN
IN
COMP
GND
GND
CURRENT
SENSE
AMP
PWM
1MHz
COMPARATOR
SQ
R
SW
DRV
PROTECTION
LOGIC
(ILIM, OT)
RUN/STOP
COMPARATORS
ERROR
AMP
FB
gm
SOFT-START
+ REF
TIMER
1.245V
VIN
10µF 0.1µF
ADP3089
IN
SW
IN
DRV
GND GND
COMP FB
47pF
470pF
10.7kΩ
10µH
20BQ030
18.2kΩ
41.2kΩ
VOUT
1.8V@1A
22µF
Figure 1. Typical Application
REV. PrE
8/26/02
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2002
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