650 kHz /1.3 MHz Step-Up PWM DC-to-DC Switching Converters Data Sheet ADP1612/ADP1613 FEATURES TYPICAL APPLICATION CIRCUIT L1 Current limit 1.4 A for the ADP1612 ADP1612/ 2.0 A for the ADP 1613 D1 V ADP1613 V IN OUT Minimum input voltage 6 5 VIN SW 1.8 V for the ADP1612 ON R1 OFF 3 EN 2.5 V for the ADP1613 C IN 2 FB 1.3MHz Pin-selectable 650 kHz or 1.3 MHz PWM frequency 7 FREQ 650kHz R2 Adjustable output voltage up to 20 V (DEFAULT) 8 1 SS COMP Adjustable soft start C OUT GND R COMP C SS Undervoltage lockout 4 C COMP Thermal shutdown 8-lead MSOP Figure 1. Step-Up Regulator Configuration Supported by ADIsimPower design tool ADIsimPower downloadable design tools for boost, coupled- SEPIC, and SEPIC Cuk configurations APPLICATIONS TFT LCD bias supplies Portable applications Industrial/instrumentation equipment 100 GENERAL DESCRIPTION V = 5V IN f = 1.3MHz SW The ADP1612/ADP1613 are step-up dc-to-dc switching con- 90 T = 25C A verters with an integrated power switch capable of providing 80 an output voltage as high as 20 V. With a package height of less than 1.1 mm, the ADP1612/ADP1613 are optimal for space- 70 constrained applications such as portable devices or thin film transistor (TFT) liquid crystal displays (LCDs). 60 The ADP1612/ADP1613 operate in current mode pulse-width 50 modulation (PWM) with up to 94% efficiency. Adjustable ADP1612, V = 12V OUT ADP1612, V = 15V OUT soft start prevents inrush currents when the part is enabled. 40 ADP1613, V = 12V OUT The pin-selectable switching frequency and PWM current-mode ADP1613, V = 15V OUT 30 architecture allow for excellent transient response, easy noise 1 10 100 1k filtering, and the use of small, cost-saving external inductors LOAD CURRENT (mA) and capacitors. Other key features include undervoltage lockout Figure 2. ADP1612/ADP1613 Efficiency for Various Output Voltages (UVLO), thermal shutdown (TSD), and logic controlled enable. The ADP1612/ADP1613 are available in the lead-free 8-lead MSOP. Rev. D 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. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 20092012 Analog Devices, Inc. All rights reserved. EFFICIENCY (%) 06772-009 06772-001ADP1612/ADP1613 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Enable/Shutdown Control ........................................................ 12 Applications ....................................................................................... 1 Applications Information .............................................................. 13 Typical Application Circuit ............................................................. 1 ADIsimPower Design Tool ....................................................... 13 General Description ......................................................................... 1 Setting the Output Voltage ........................................................ 13 Revision History ............................................................................... 2 Inductor Selection ...................................................................... 13 Specifications ..................................................................................... 3 Choosing the Input and Output Capacitors ........................... 14 Absolute Maximum Ratings ............................................................ 4 Diode Selection ........................................................................... 14 Thermal Resistance ...................................................................... 4 Loop Compensation .................................................................. 14 Boundary Condition .................................................................... 4 Soft Start Capacitor .................................................................... 15 ESD Caution .................................................................................. 4 Typical Application Circuits ......................................................... 16 Pin Configuration and Function Descriptions ............................. 5 Step-Up Regulator ...................................................................... 16 Typical Performance Characteristics ............................................. 6 Step-Up Regulator Circuit Examples ....................................... 16 Theory of Operation ...................................................................... 11 SEPIC Converter ........................................................................ 22 Current-Mode PWM Operation .............................................. 11 TFT LCD Bias Supply ................................................................ 22 Frequency Selection ................................................................... 11 PCB Layout Guidelines .................................................................. 24 Soft Start ...................................................................................... 11 Outline Dimensions ....................................................................... 25 Thermal Shutdown (TSD) ......................................................... 12 Ordering Guide .......................................................................... 25 UnderVoltage Lockout (UVLO) ............................................... 12 REVISION HISTORY 11/12Rev. C to Rev. D 9/09Rev. 0 to Rev. A Changes to Choosing the Input and Output Capacitors Section Changes to Figure 45 ...................................................................... 17 and Loop Compensation Section .................................................. 14 Changes to Figure 48 and Figure 51 ............................................ 18 Changes to Figure 54 and Figure 57 ............................................ 19 7/12Rev. B to Rev. C Changes to Figure 60 and Figure 63 ............................................ 20 Changes to Features Section............................................................. 1 Changes to Figure 66 and Figure 69 ............................................ 21 Added ADIsimPower Design Tool Section .................................. 13 Changes to Figure 72 ...................................................................... 22 Changes to Ordering Guide ........................................................... 25 Changes to Ordering Guide .......................................................... 25 4/11Rev. A to Rev. B 4/09Revision 0: Initial Version Changes to Features Section............................................................ 1 Changes to Reference Feedback Voltage Parameter .................... 3 Changes to Ordering Guide .......................................................... 25 Rev. D Page 2 of 28