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ADP1611-EVAL Fiches technique(PDF) 1 Page - Analog Devices |
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ADP1611-EVAL Fiches technique(HTML) 1 Page - Analog Devices |
1 / 20 page 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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