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ADP1611-EVAL Fiches technique(PDF) 1 Page - Analog Devices

No de pièce ADP1611-EVAL
Description  20 V,1.2 MHz Step-Up DC-to-DC Switching Converter
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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ADP1611-EVAL Fiches technique(HTML) 1 Page - Analog Devices

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20 V,1.2 MHz Step-Up
DC-to-DC Switching Converter
ADP1611
Rev. 0
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.
Specifications subject to change without notice. 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
© 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Fully integrated 1.2 A , 0.23 Ω power switch
Pin-selectable 700 kHz or 1.2 MHz PWM frequency
90% efficiency
Adjustable output voltage up to 20 V
3% output regulation accuracy
Adjustable soft start
Input undervoltage lockout
MSOP 8-lead package
APPLICATIONS
TFT LC bias supplies
Portable applications
Industrial/instrumentation equipment
GENERAL DESCRIPTION
The ADP1611 is a step-up dc-to-dc switching converter with an
integrated 1.2 A, 0.23 Ω power switch capable of providing an
output voltage as high as 20 V. With a package height of less
than 1.1 mm, the ADP1611 is optimal for space-constrained
applications such as portable devices or thin film transistor
(TFT) liquid crystal displays (LCDs).
The ADP1611 operates in pulse-width modulation (PWM)
current mode with up to 90% efficiency. Adjustable soft start
prevents inrush currents at startup. The pin-selectable switching
frequency and PWM current-mode architecture allow excellent
transient response, easy noise filtering, and the use of small,
cost-saving external inductors and capacitors.
The ADP1611 is offered in the Pb-free 8-lead MSOP and
operates over the temperature range of −40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
REF
RAMP
GEN
RT
DRIVER
CURRENT-
SENSE
AMPLIFIER
COMP
SW
FB
IN
COMPARATOR
ERROR
AMP
GND
BIAS
gm
SD
OSC
ADP1611
Q
S
R
F/F
2
7
3
5
4
1
6
8
SOFT START
SS
Figure 1.


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