50 mA/500 mA, Ultralow Power Step-Down Regulator With Battery Voltage Monitor Data Sheet ADP5303 FEATURES TYPICAL APPLICATION CIRCUIT Input supply voltage range: 2.15 V to 6.50 V V = IN 2.2H V 2.15V TO 6.50V OUT Operates down to 2.00 V PVIN SW 10F Ultralow 240 nA quiescent current with no load ADP5303 10F (WLCSP-9) Selectable output voltages of 1.2 V to 3.6 V, or 0.8 V to 5.0 V ON PGND 1.5% output accuracy over the full temperature range in EN OFF pulse-width modulation (PWM) mode PWM SYNC/ Selectable hysteresis mode or PWM operation mode FB HYS MODE Output current VID0: 1.2V VID8: 2.5V VID1: 1.5V VID9: 2.6V Up to 50 mA in hysteresis mode VID2: 1.8V VID10: 2.7V VINOK VID VID3: 2.0V VID11: 2.8V Up to 500 mA in PWM mode R0 VID4: 2.1V VID12: 2.9V VID5: 2.2V VID13: 3.0V AGND VINOK flag to monitor input battery voltage VID6: 2.3V VID14: 3.3V VID7: 2.4V VID15: 3.6V 100% duty cycle operation mode 2 MHz switching frequency with optional synchronization Figure 1. input from 1.5 MHz to 2.5 MHz Quick output discharge (QOD) option UVLO, OCP, and TSD protection 9-ball, 1.65 mm 1.87 mm WLCSP Junction temperature: 40C to +125C APPLICATIONS Energy (gas, water) metering Portable and battery-powered equipment Medical applications Keep-alive power supply GENERAL DESCRIPTION The ADP5303 is high efficiency, ultralow quiescent current The ADP5303 integrates an ultralow power comparator with a step-down regulator that draws only 240 nA quiescent current factory programmable voltage reference to monitor the input to regulate the output at no load. battery voltage. The regulator runs at a 2 MHz switching frequency in PWM mode and the SYNC/MODE pin can be synchronized The ADP5303 runs from an input voltage of 2.15 V to 6.50 V, to an external clock from 1.5 MHz to 2.5 MHz. allowing the use of multiple alkaline or NiMH cells, Li-Ion cells, or other power sources. The output voltage is selectable from 0.8 V Other key features in the ADP5303 include separate enabling, to 5.0 V by an external VID resistor and a factory fuse. The QOD, and safety features such as overcurrent protection (OCP), thermal shutdown (TSD), and input undervoltage total solution requires only four tiny external components. lockout (UVLO). The ADP5303 can operate between hysteresis mode and PWM mode via the SYNC/MODE pin. In hysteresis mode, the regulator The ADP5303 is available in 9-ball, 1.65 mm 1.87 mm achieves excellent efficiency at less than 1 mW and provides up WLCSP package rated for the 40C to +125C junction to 50 mA of output current. In PWM mode, the regulator temperature range. produces a lower output ripple and supplies up to 500 mA of output current. The flexible configuration capability during operation of the device enables very efficient power management to meet both long battery life and low system noise requirements. 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 20152019 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. 13444-001ADP5303 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Short-Circuit Protection............................................................ 15 Applications ....................................................................................... 1 Soft Start ...................................................................................... 15 Typical Application Circuit ............................................................. 1 Startup with Precharged Output .............................................. 15 General Description ......................................................................... 1 100% Duty Cycle Operation ..................................................... 15 Revision History ............................................................................... 2 Active Discharge ......................................................................... 15 Detailed Functional Block Diagram .............................................. 3 VINOK Function........................................................................ 15 Specifications ..................................................................................... 4 Thermal Shutdown .................................................................... 15 Absolute Maximum Ratings ............................................................ 6 Applications Information .............................................................. 16 Thermal Resistance ...................................................................... 6 External Component Selection ................................................ 16 ESD Caution .................................................................................. 6 Selecting the Inductor ................................................................ 16 Pin Configuration and Function Descriptions ............................. 7 Output Capacitor ........................................................................ 16 Typical Performance Characteristics ............................................. 8 Input Capacitor ........................................................................... 17 Theory of Operation ...................................................................... 14 Efficiency ..................................................................................... 17 Buck Regulator Operational Modes ......................................... 14 Printed Circuit Board Layout Recommendations ................. 18 Oscillator and Synchronization ................................................ 14 Typical Application Circuits ......................................................... 19 Adjustable and Fixed Output Voltages .................................... 14 Factory Programmable Options ................................................... 20 Undervoltage Lockout (UVLO) ............................................... 15 Outline Dimensions ....................................................................... 21 Enable/Disable ............................................................................ 15 Ordering Guide .......................................................................... 21 Current Limit .............................................................................. 15 REVISION HISTORY 3/2019Rev. A to Rev. B Change to SYNC Clock Range Parameter, Table 1 ....................... 4 Changes to Adjustable and Fixed Output Voltages Section ...... 14 Change to Table 4 .............................................................................. 7 Changes to Table 8, Table 9, Table 10, and Table 11 .................. 20 Change to Oscillator and Synchronization Section ................... 14 Changes to Ordering Guide .......................................................... 21 Changes to Table 8 .......................................................................... 20 6/2016Rev. 0 to Rev. A 10/2015Revision 0: Initial Version Change to Features Section and General Description Section ................................................................................................ 1 Rev. B Page 2 of 21