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ADP3089 Datasheet دیتاشیت PDF دانلود

دیتاشیت - Analog Devices - 1A Buck Regulator

شماره قطعه ADP3089
شرح مفصل 1A Buck Regulator
تولید کننده Analog Devices 
آرم Analog Devices 


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ADP3089 شرح
PRELIMINARY TECHNICAL DATA
a
1MHz,1ABuckRegulator
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
www.DataSheet4US.ciommple 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
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 12 V input with a typi-
cal 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 efficiently, respon-
sively, 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
gm
+ REF
1.245V
SOFT-START
TIMER
FB
VIN
10µF 0.1µF
ADP3089
IN SW
IN SW
GND DRV
COMP FB
470pF
20k
10µH
1N5817
53.6k
120k
VOUT
1.8V@1A
+
10µF
Figure 1. Typical Application
REV. PrC
2/13/02
Information furnished by Analog Devices is believed to be accurate and reli-
able. However, no responsibility is assumed byAnalog 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
www.analog.com
Fax: 781/326-8703
AnalogD evices, In c., 2002

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