650 kHz/1.3 MHz, 4 A, Step-Up, PWM, DC-to-DC Switching Converter Data Sheet ADP1614 FEATURES TYPICAL APPLICATIONS CIRCUITS L1 Adjustable and fixed current-limit options Adjustable up to 4 A ADP1614 Fixed 3 A ADJUSTABLE D1 V V IN CURRENT OUT 2.5 V to 5.5 V input voltage range 8 LIMIT 6 VIN SW 7 650 kHz or 1.3 MHz fixed frequency option ON SW R1 3 OFF EN Adjustable output voltage, up to 20 V C IN 2 FB Adjustable soft start 9 CLRES R2 Undervoltage lockout 10 1 SS COMP Thermal shutdown C OUT GND GND EP R R COMP C CL SS 3 mm 3 mm, 10-lead LFCSP 4 5 11 C COMP Supported by ADIsimPower design tool APPLICATIONS Figure 1. Step-Up Regulator Configuration for Adjustable Current-Limit Options L1 TFT LCD bias supplies Portable applications ADP1614 Industrial/instrumentation equipment FIXED D1 V V IN CURRENT OUT 8 LIMIT 6 VIN SW 7 ON SW GENERAL DESCRIPTION R1 3 OFF EN C IN FB 2 The ADP1614 is a step-up, dc-to-dc switching converter with 1.3MHz 9 FREQ an integrated power switch capable of providing an output voltage R2 650kHz (DEFAULT) as high as 20 V. The ADP1614 is available with a pin-adjustable 10 1 SS COMP C OUT GND GND EP R current limit that is set via an external resistor with the boost C COMP SS 4 5 11 C COMP switching frequency fixed to either 650 kHz or 1.3 MHz. Alternatively, the ADP1614 is also available with fixed 3 A current limit and a pin-selectable frequency. With a package Figure 2. Step-Up Regulator Configuration for Fixed Current-Limit Options height of 0.8 mm, the ADP1614 is optimal for space constrained applications, such as portable devices or thin film transistor (TFT) liquid crystal displays (LCDs). The ADP1614 operates in current-mode pulse-width modulation (PWM) with up to 94% efficiency. Adjustable soft start prevents inrush currents when the part is enabled. The PWM current-mode architecture allows excellent transient response, easy noise filtering, and the use of small, cost-saving external inductors and capacitors. Other key features include undervoltage lockout (UVLO), thermal shutdown (TSD), and logic controlled enable. The ADP1614 is available in a Pb-free, 10-lead lead frame chip scale package (LFCSP). Rev. B Document Feedback 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 20122014 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 10293-201 10293-001ADP1614 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Soft Start ...................................................................................... 13 Applications ....................................................................................... 1 Thermal Shutdown (TSD) ........................................................ 13 General Description ......................................................................... 1 Undervoltage Lockout (UVLO) ............................................... 13 Typical Applications Circuits .......................................................... 1 Shutdown Mode ......................................................................... 13 Revision History ............................................................................... 2 Applications Information .............................................................. 14 Specifications ..................................................................................... 3 ADIsimPower Design Tool ....................................................... 14 Absolute Maximum Ratings ............................................................ 5 Setting the Output Voltage ........................................................ 14 Thermal Resistance ...................................................................... 5 Inductor Selection ...................................................................... 14 ESD Caution .................................................................................. 5 Choosing the Input and Output Capacitors ........................... 15 Pin Configuration and Function Descriptions ............................. 6 Diode Selection ........................................................................... 15 Typical Performance Characteristics ............................................. 7 Loop Compensation .................................................................. 15 Theory of Operation ...................................................................... 12 Soft Start Capacitor .................................................................... 16 Current-Mode PWM Operation .............................................. 13 PCB Layout Guidelines .................................................................. 17 Adjustable Current Limit .......................................................... 13 Outline Dimensions ....................................................................... 18 Frequency Selection ................................................................... 13 Ordering Guide .......................................................................... 18 REVISION HISTORY 11/14Rev. A to Rev. B Changes to Ordering Guide .......................................................... 18 6/13Rev. 0 to Rev. A Changes to Features Section, General Description Section, and Figure 1 .............................................................................................. 1 Added Figure 2 Renumbered Sequentially .................................. 1 Changes to Table 1 ............................................................................ 3 Added FREQ Pin to Table 2 ............................................................ 5 Changes to Pin 9 ............................................................................... 6 Added Figure 26 and Figure 27..................................................... 10 Added Figure 28 to Figure 31 ........................................................ 11 Changes to Theory of Operation Section and Figure 32 ........... 12 Changes to Adjustable Current Limit Section and Frequency Selection Section ............................................................................. 13 Changes to Figure 35 and Figure 36 Captions ............................ 17 Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 18 6/12Revision 0: Initial Version Rev. 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