Compact, 800 mA, 3 MHz, Simple DVS, Buck Regulator Data Sheet ADP2147 FEATURES GENERAL DESCRIPTION Input voltage: 2.3 V to 5.5 V The ADP2147 is a high efficiency, low quiescent current, step- Peak efficiency: 95% down (buck) dc-to-dc regulator with an output voltage that can 3 MHz fixed frequency operation be switched between two different settings under the control of Low quiescent current: 23 A a select pin. The total solution requires only three tiny external Ultralow shutdown current: 0.2 A (typical) components. VSEL pin for simple dynamic voltage scaling (DVS) The buck regulator automatically switches operating modes, 100% duty cycle low dropout mode depending on the load current level, to maximize efficiency. At Internal synchronous rectifier, compensation, and soft start high output loads, the buck regulator operates in PWM mode. Current overload and thermal shutdown protection When the load current falls below a predefined threshold, the Small, 6-ball, 1 mm 1.5 mm WLCSP package regulator operates in power save mode (PSM), improving the light-load efficiency. APPLICATIONS The ADP2147 runs on input voltages of 2.3 V to 5.5 V, which PDAs and palmtop computers allows for single lithium or lithium polymer cells, multiple Wireless handsets alkaline or NiMH cells, PCMCIA, USB, and other standard Digital audio portable media players power sources. The maximum load current of 800 mA is Digital cameras, GPS navigation units achievable across the input voltage range. Low power portable medical equipment The ADP2147 is available with fixed output voltages from 0.8 V to 3.3 V. All versions include an internal power switch and synchronous rectifier for minimal external part count and high efficiency. The ADP2147 has an internal soft start and is internally compensated. During logic controlled shutdown, the input is disconnected from the output, and the ADP2147 draws less than 0.2 A (typical) from the power source. Other key features include undervoltage lockout to prevent deep battery discharge and soft start to prevent input current over- shoot at startup. The ADP2147 is available in a 6-ball WLCSP. TYPICAL APPLICATIONS CIRCUIT 1.0H V 2.3V TO 5.5V OUT VIN SW 4.7F 4.7F ADP2147 ON EN VOUT OFF V H OUT VSEL V L OUT GND Figure 1. Rev. A 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 20112019 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. 09 88 5-00 1ADP2147 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Enable/Shutdown ....................................................................... 11 Applications ....................................................................................... 1 Simple Dynamic Voltage Scaling (DVS) ................................. 12 General Description ......................................................................... 1 Short-Circuit Protection ............................................................ 12 Typical Applications Circuit ............................................................ 1 Undervoltage Lockout ............................................................... 12 Revision History ............................................................................... 2 Thermal Protection .................................................................... 12 Specif icat ions ..................................................................................... 3 Soft Start ...................................................................................... 12 Input and Output Capacitor, Recommended Specifications .. 3 Current Limit .............................................................................. 12 Absolute Maximum Ratings ............................................................ 4 100% Duty Operation ................................................................ 12 Thermal Data ................................................................................ 4 Applications Information .............................................................. 13 Thermal Resistance ...................................................................... 4 External Component Selection ................................................ 13 ESD Caution .................................................................................. 4 Thermal Considerations ............................................................ 14 Pin Configuration and Function Descriptions ............................. 5 PCB Layout Guidelines .............................................................. 14 Typical Performance Characteristics ............................................. 6 Evaluation Board ............................................................................ 15 Theory of Operation ...................................................................... 11 Evaluation Board Layout ........................................................... 15 Control Scheme .......................................................................... 11 Outline Dimensions ....................................................................... 16 PWM Mode ................................................................................. 11 Ordering Guide .......................................................................... 16 Power Save Mode ........................................................................ 11 REVISION HISTORY 9/2019Rev. 0 to Rev. A 5/2011Revision 0: Initial Version Changes to Output Capacitor Section ......................................... 14 Changes to Ordering Guide .......................................................... 16 Rev. A Page 2 of 16