1.2 MHz DC-to-DC Step-Up Switching Converter ADP1610 FEATURES GENERAL DESCRIPTION Fully integrated 1.2 A, 0.2 , power switch The ADP1610 is a dc-to-dc step-up switching converter with Pin-selectable 700 kHz or 1.2 MHz PWM frequency an integrated 1.2 A, 0.2 power switch capable of providing 92% efficiency an output voltage as high as 12 V. With a package height of less Adjustable output voltage up to 12 V than 1.1 mm, the ADP1610 is optimal for space-constrained 3% output regulation accuracy applications such as portable devices or thin film transistor Adjustable soft start (TFT) liquid crystal displays (LCDs). Input undervoltage lockout The ADP1610 operates in pulse-width modulation (PWM) current MSOP 8-lead package mode with up to 92% efficiency. Adjustable soft start prevents inrush currents at startup. The pin-selectable switching frequency APPLICATIONS and PWM current mode architecture allow excellent transient TFT LC bias supplies response, easy noise filtering, and the use of small, cost-saving Portable applications external inductors and capacitors. Industrial/instrumentation equipment The ADP1610 is offered in the RoHS compliant 8-lead MSOP and operates over the temperature range of 40C to +85C. FUNCTIONAL BLOCK DIAGRAM COMP IN 1 6 ERROR AMP REF ADP1610 g m BIAS FB 2 5 SW F/F R Q RAMP S GEN DRIVER COMPARATOR RT 7 OSC 8 SS SOFT START 3 CURRENT SD SENSE AMPLIFIER 4 GND Figure 1. Rev. A 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20042008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 04472-001ADP1610 TABLE OF CONTENTS Features .............................................................................................. 1 Setting the Output Voltage ........................................................ 10 Applications ....................................................................................... 1 Inductor Selection ...................................................................... 10 General Description ......................................................................... 1 Choosing the Input and Output Capacitors ........................... 11 Functional Block Diagram .............................................................. 1 Diode Selection ........................................................................... 13 Revision History ............................................................................... 2 Loop Compensation .................................................................. 13 Specif icat ions ..................................................................................... 3 Soft Start Capacitor .................................................................... 14 Absolute Maximum Ratings ............................................................ 4 Application Circuits ................................................................... 15 ESD Caution .................................................................................. 4 DC-to-DC Step-Up Switching Converter with True Shutdown ..................................................................................... 15 Pin Configuration and Function Descriptions ............................. 5 TFT LCD Bias Supply ................................................................ 15 Typical Performance Characteristics ............................................. 6 Sepic Power Supply .................................................................... 16 Theory of Operation ...................................................................... 10 Layout Procedure ........................................................................... 17 Current Mode PWM Operation ............................................... 10 Outline Dimensions ....................................................................... 18 Frequency Selection ................................................................... 10 Ordering Guide .......................................................................... 18 Soft Start ...................................................................................... 10 On/Off Control ........................................................................... 10 REVISION HISTORY 9/08Rev. 0 to Rev. A Changes to Table 4 .......................................................................... 11 Changes to Table 5 .......................................................................... 14 10/04Revision 0: Initial Version Rev. A Page 2 of 20