Ultralow Power Step-Down Regulator for Energy Harvesting Data Sheet ADP5304 FEATURES TYPICAL APPLICATION CIRCUIT 2.2H Input supply voltage range: 2.15 V to 6.50 V V = 2.15V TO 6.5V V IN OUT PVIN SW Operation down to 2.00 V typical 10F ADP5304 10F Ultralow, 260 nA typical quiescent current with no load ON Selective output voltage from 1.2 V to 3.6 V (or 0.8 V to 5.0 V) EN PGND OFF 2.5% output accuracy over the full temperature range MODE Output current up to 50 mA in hysteresis mode FB VINOK flag to monitor the input voltage NC VINOK VID0: 1.2V VID8: 2.5V 100% duty cycle operation mode AGND VID VID1: 1.5V VID9: 2.6V VID2: 1.8V VID10: 2.7V Quick output discharge (QOD) option R0 VID3: 2.0V VID11: 2.8V VID4: 2.1V VID12: 2.9V Undervoltage lockout (UVLO), overcurrent protection (OCP), VID5: 2.2V VID13: 3.0V EPAD VID6: 2.3V VID14: 3.3V and thermal shutdown (TSD) protection VID7: 2.4V VID15: 3.6V 10-lead, 3 mm 3 mm LFCSP package Figure 1. 40C to +125C operating junction temperature range APPLICATIONS Energy (gas, water) metering Energy harvesting applications Portable and battery-powered equipment Medical applications Keep-alive power supply GENERAL DESCRIPTION The ADP5304 is a high efficient, ultralow quiescent current energy harvester to charge up the conventional capacitor or step-down regulator that draws only 260 nA of quiescent super capacitor. current to regulate the output at no load. The ADP5304 integrates an ultralow power comparator with a The ADP5304 runs from an input voltage range of 2.15 V to factory programmable voltage reference to monitor the voltage 6.50 V, allowing the use of the multiple alkaline, NiMH, and of the input power source. The voltage reference, with hysteresis, is Lithium cells, or the use of a high impedance power source. The the threshold for the stopping and the starting of the switching, output voltage is selectable from 0.8 V to 5.0 V by an external allowing the use of the high impedance power source. VID resistor to ground. The total solution requires only four Other key features of the ADP5304 include separate enabling tiny external components. and a QOD. Safety features, such as OCP, TSD, and input The ADP5304 operates in hysteresis mode via connecting the UVLO are also included. MODE pin to ground. In hysteresis mode, the regulator The ADP5304 is available in 10-lead, 3 mm 3 mm LFCSP achieves excellent efficiency at a power of less than 1 mW and package rated for the 40C to +125C junction temperature range. provides up to 50 mA of output load. The device enables very efficient power management to achieve the collection of small amounts of energy from the high impedance battery or the Rev. 0 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 2015 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. 13493-001ADP5304 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Current Limit .............................................................................. 12 Applications ....................................................................................... 1 Short-Circuit Protection ............................................................ 12 Typical Application Circuit ............................................................. 1 Soft Start ...................................................................................... 12 General Description ......................................................................... 1 Startup with Precharged Output .............................................. 12 Revision History ............................................................................... 2 100% Duty Operation ................................................................ 12 Detailed Functional Block Diagram .............................................. 3 Active Discharge ......................................................................... 12 Specif icat ions ..................................................................................... 4 Thermal Shutdown .................................................................... 12 Absolute Maximum Ratings ............................................................ 5 Applications Information .............................................................. 13 Thermal Resistance ...................................................................... 5 External Component Selection ................................................ 13 ESD Caution .................................................................................. 5 Selecting the Inductor ................................................................ 13 Pin Configuration and Function Descriptions ............................. 6 Output Capacitor ........................................................................ 13 Typical Performance Characteristics ............................................. 7 Input Capacitor ........................................................................... 14 Theory of Operation ...................................................................... 11 Layout Recommendations ........................................................ 14 Buck Regulator Operational Mode .......................................... 11 Typical Application Circuits ......................................................... 15 Adjustable and Fixed Output Voltages .................................... 11 Factory Programmable Options ................................................... 16 Undervoltage Lockout (UVLO) ............................................... 11 Outline Dimensions ....................................................................... 17 Enable/Disable ............................................................................ 11 Ordering Guide .......................................................................... 17 VINOK Function ........................................................................ 11 REVISION HISTORY 10/15Revision 0: Initial Version Rev. 0 Page 2 of 17