600 mA/1000 mA, 2.5 MHz Buck-Boost DC-to-DC Converters Data Sheet ADP2503/ADP2504 FEATURES GENERAL DESCRIPTION 1 mm height profile The ADP2503/ADP2504 are high efficiency, low quiescent current Compact PCB footprint step-up/step-down dc-to-dc converters that can operate at input Seamless transition between modes voltages greater than, less than, or equal to the regulated output 38 A typical quiescent current voltage. The power switches and synchronous rectifiers are 2.5 MHz operation enables 1.5 H inductor internal to minimize external device count. At high load currents, Input voltage: 2.3 V to 5.5 V the ADP2503/ADP2504 use a current-mode, fixed frequency Fixed output voltage: 2.8 V to 5.0 V pulse-width modulation (PWM) control scheme for optimal Adjustable model output voltage range: 2.8 V to 5.5 V stability and transient response. To ensure the longest battery life 600 mA (ADP2503) and 1000 mA (ADP2504) output options in portable applications, the ADP2503/ADP2504 have an optional Boost converter configuration with load disconnect power save mode that reduces the switching frequency under SYNC pin with three different modes light load conditions. For wireless and other low noise applica- Power save mode (PSM) for improved light load efficiency tions where variable frequency power save mode may cause Forced fixed frequency operation mode interference, the logic control input sync forces fixed frequency Synchronization with external clock PWM operation under all load conditions. Internal compensation The ADP2503/ADP2504 can run from input voltages between Soft start 2.3 V and 5.5 V, allowing single lithium or lithium polymer cell, Enable/shutdown logic input multiple alkaline or NiMH cells, PCMCIA, USB, and other stan- Overtemperature protection dard power sources. The ADP2503/ADP2504 have fixed output Short-circuit protection options, or using the adjustable model, the output voltage can Undervoltage lockout protection be programmed through an external resistor divider. Compensa- Small 10-lead 3 mm 3 mm LFCSP (QFN) package tion is internal to minimize the number of external components. Supported by ADIsimPower design tool During logic-controlled shutdown, the input is disconnected APPLICATIONS from the output and draws less than 1 A from the input source. Wireless handsets Operating as boost converters, the ADP2503/ADP2504 feature a Digital cameras/portable audio players true load disconnect function that isolates the load from the Miniature hard disk power supplies power source. Other key features include undervoltage lockout USB powered devices to prevent deep battery discharge, and soft start to prevent input current overshoot at startup. TYPICAL APPLICATION CIRCUIT 1.5H SW1 SW2 ADP2503/ADP2504 V V IN OUT 2.3V TO 5.5V 2.8V TO 5V PVIN VOUT VIN FB 10F 22F 1 SYNC EN AGND PGND ON OFF 1 ALLOWS THE ADP2503/ADP2504 TO OPERATE IN THREE DIFFERENT MODES. Figure 1. Rev. D 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 20082015 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. 07475-001ADP2503/ADP2504 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Soft Start ...................................................................................... 11 Applications ....................................................................................... 1 SYNC Function ........................................................................... 11 General Description ......................................................................... 1 Enable ........................................................................................... 11 Typical Application Circuit ............................................................. 1 Undervoltage Lockout ............................................................... 12 Revision History ............................................................................... 2 Thermal Shutdown .................................................................... 12 Specif icat ions ..................................................................................... 3 Short-Circuit Protection ............................................................ 12 Absolute Maximum Ratings ............................................................ 4 Reverse Current Limit ............................................................... 12 Thermal Data ................................................................................ 4 Applications Information .............................................................. 13 Thermal Resistance ...................................................................... 4 ADIsimPower Design Tool ....................................................... 13 ESD Caution .................................................................................. 4 Inductor Selection ...................................................................... 13 Pin Configuration and Function Descriptions ............................. 5 Output Voltage Programming .................................................. 14 Typical Performance Characteristics ............................................. 6 PCB Layout Guidelines .................................................................. 15 Theory of Operation ...................................................................... 11 Outline Dimensions ....................................................................... 16 Power Save Mode ........................................................................ 11 Ordering Guide .......................................................................... 16 REVISION HISTORY 10/15Rev. C to Rev. D 8/09Rev. 0 to Rev. A Changes to Figure 3 and Figure 4 ................................................... 6 Changes to Features Section, Figure 1, and General Description Changes to Figure 15, Figure 16, and Figure 17 ........................... 8 S ection ................................................................................................. 1 Changes to Figure 22 and Figure 23 ............................................... 9 Changes to Feedback Voltage Parameter and EN, SYNC Leakage Current Parameter, Table 1 ............................................... 3 8/13Rev. B to Rev. C Changes to Table 2 and Thermal Resistance Section ................... 4 Change to Features Section ............................................................. 1 Added Thermal Data Section .......................................................... 4 Added ADIsimPower Design Tool Section ................................. 13 Changes to Figure 2 and Table 4 ...................................................... 5 Updated Outline Dimensions ....................................................... 16 Changes to Figure 12 ......................................................................... 7 Changes to Ordering Guide .......................................................... 16 Changes to Figure 17 ......................................................................... 8 6/10Rev. A to Rev. B Changes to SYNC Function Section ............................................ 11 Changes to Undervoltage Lockout Section ................................. 12 Changes to Ordering Guide .......................................................... 16 Changes to Table 6 .......................................................................... 13 Added Output Voltage Programming Section ........................... 14 Added Figure 30 Renumbered Sequentially .............................. 14 Changes to Ordering Guide .......................................................... 16 10/08Revision 0: Initial Version Rev. D Page 2 of 16