ADP3088(RevC) Ver la hoja de datos (PDF) - Analog Devices
Número de pieza
componentes Descripción
Fabricante
ADP3088 Datasheet PDF : 16 Pages
| |||
a
1 MHz, 750 mA Buck Regulator
ADP3088
FEATURES
FUNCTIONAL BLOCK DIAGRAM
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,
IN
CURRENT
SW
Line, and Load
100% Duty Cycle Operation
IN
SENSE
AMP
PWM
1MHz
COMPARATOR
DRV
SQ
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
E Cycle-by-Cycle Current Limit
APPLICATIONS
PDAs and Palmtop Computers
T Notebook Computers
PCMCIA Cards
Bus Products
Portable Instruments
COMP
GND
GND
R
PROTECTION
LOGIC
(ILIM, OT)
RUN/STOP
COMPARATORS
ERROR
AMP
FB
gm
ADP3088
+ REF
1.245V
SOFT START
TIMER
E GENERAL DESCRIPTION
L The ADP3088 is a high frequency, nonsynchronous PWM step-
down dc-to-dc regulator with an integrated 1 A power switch
in a space-saving MSOP-8 package. It provides high efficiency
and excellent dynamic response and is very simple to use.
O 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. The device
operates in PWM current mode under heavy loads and saves
S 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, the ADP3088 is
B ideal for many applications, including portable, battery-powered
applications where local point-of-use power regulation is
required. Supporting output voltages down to 1.25 V, the
ADP3088 is ideal for generating low voltage rails, providing
O the optimal solution in its class for delivering power efficiently,
VIN
3.3V
10F
0.1F
4.7pF
ADP3088
IN
SW
IN
DRV
GND GND
COMP FB
220pF
20k⍀
3.3H
10.0k⍀
1N5817
22.4k⍀
VOUT
1.8V
10F
Figure 1. Typical Application
responsively, and simply with a minimal printed circuit board area.
The device is specified over the industrial temperature range of
–40∞C to +85∞C.
REV. C
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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 © 2004 Analog Devices, Inc. All rights reserved.
Share Link: 