50 mA/500 mA, Ultralow Power Step-Down Regulator with Battery Voltage Monitor Data Sheet ADP5302 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 ADP5302 10F (LFCSP-10) 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 STOP Up to 50 mA in hysteresis mode STOP VINOK SW VID0: 1.2V VID8: 2.5V VID1: 1.5V VID9: 2.6V Up to 500 mA in PWM mode VID2: 1.8V VID10: 2.7V AGND VID VID3: 2.0V VID11: 2.8V VINOK flag to monitor input battery voltage VID4: 2.1V VID12: 2.9V R0 VID5: 2.2V VID13: 3.0V EPAD Ultrafast stop switching control 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 10-lead, 3 mm 3 mm LFCSP package Junction temperature: 40C to +125C APPLICATIONS Energy (gas, water) metering Portable and battery-powered equipment Medical applications Keep-alive power supplies GENERAL DESCRIPTION The ADP5302 is a high efficiency, ultralow quiescent current The ADP5302 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 The ADP5302 runs from an input voltage of 2.15 V to 6.50 V, synchronized 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 The ADP5302 includes an extra STOP pin that can temporarily to 5.0 V by an external, dynamic voltage identification (VID) disable the regulator switching in this way, a quiet system environ- ment can be achieved to benefit the noise sensitive circuitry, which resistor and a factory fuse. The total solution requires only four tiny external components. includes data conversion, RF data transmission, and analog sensors. The ADP5302 can operate between hysteresis mode and PWM Other key features in the ADP5302 include separate enabling, mode via the SYNC/MODE pin. In hysteresis mode, the regulator QOD, and safety features, such as overcurrent protection achieves excellent efficiency at less than 1 mW and provides up to (OCP), thermal shutdown (TSD), and input undervoltage 50 mA of output current. In PWM mode, the regulator produces a lockout (UVLO). lower output ripple and supplies up to 500 mA of output current. The ADP5302 is available in a 10-lead, 3 mm 3 mm LFCSP The flexible configuration capability during operation of the package rated for the 40C to +125C junction temperature range. 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. 13443-001ADP5302 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 Operation ................................................................ 15 Revision History ............................................................................... 2 Active Discharge ......................................................................... 15 Detailed Functional Block Diagram .............................................. 3 VINOK Function........................................................................ 15 Specif icat ions ..................................................................................... 4 STOP Switching .......................................................................... 16 Absolute Maximum Ratings ............................................................ 6 Thermal Shutdown .................................................................... 16 Thermal Resistance ...................................................................... 6 Applications Information .............................................................. 17 ESD Caution .................................................................................. 6 External Component Selection ................................................ 17 Pin Configuration and Function Descriptions ............................. 7 Selecting the Inductor ................................................................ 17 Typical Performance Characteristics ............................................. 8 Output Capacitor ........................................................................ 17 Theory of Operation ...................................................................... 14 Input Capacitor ........................................................................... 18 Buck Regulator Operational Modes ......................................... 14 Efficiency ..................................................................................... 18 Oscillator and Synchronization ................................................ 14 Printed Circuit Board Layout Recommendations ................. 19 Adjustable and Fixed Output Voltages .................................... 14 Typical Application Circuits ......................................................... 20 Undervoltage Lockout (UVLO) ............................................... 15 Factory Programmable Options ................................................... 21 Enable/Disable ............................................................................ 15 Outline Dimensions ....................................................................... 22 Current Limit .............................................................................. 15 Ordering Guide .......................................................................... 22 REVISION HISTORY 9/2019Rev. A to Rev. B Changes to Adjustable and Fixed Output Voltages Section ........... 15 Changes to Table 8, Table 9, Table 10, and Table 11 .................. 21 Updated Outline Dimensions ....................................................... 22 Changes to Ordering Guide .......................................................... 22 6/2016Rev. 0 to Rev. A Changes to Features Section and General Description Section ....... 1 Change to SYNC Clock Range Parameter, Table 1 ...................... 4 Change to Table 4 ............................................................................. 7 Change to Oscillator and Synchronization Section ................... 14 9/2015Revision 0: Initial Version Rev. B Page 2 of 22