3-Channel, Integrated Ultralow Power Solution with Dual Buck Regulators and Load Switch Data Sheet ADP5310 FEATURES TYPICAL APPLICATION CIRCUIT Wide input voltage range: 2.7 V to 15.0 V L1 ADP5310 4.7H V OUT1 EN1 SW1 700 nA quiescent current when EN1 = SYNC/MODE = low FROM MCU CHANNEL 1 C3 1.5% output accuracy over full temperature range in PWM mode PWRGD BUCK PGND1 10F TO MCU REGULATOR MLCC 600 kHz (or 1.2 MHz) switching frequency with optional PVIN1 FB1 (800mA) V = IN R1 synchronization input from 400 kHz to 1.4 MHz 2.7V TO 15V L2 PVIN2 CHANNEL 2 4.7H V R2 OUT2 SW2 Channel 1: 800 mA buck regulator ULTRALOW C1 NC C4 POWER Automatic PSM/PWM or forced PWM mode via factory fuse 10F PGND2 10F BUCK MLCC SYNC/ MLCC REGULATOR 100% duty cycle operation mode MODE FB2 (50mA/300mA) Adjustable/fixed output options via factory fuse CHANNEL 3 V OUT3 EN3 VOUT3 Power-good flag FROM MCU LOAD C5 SWITCH Channel 2: ultralow power buck regulator 220nF MLCC VREG AGND Selectable hysteresis or PWM operation mode Output current up to 50 mA in hysteresis mode, 300 mA in C6 1F PWM mode with 100% duty cycle operation mode Low noise at 0.8 V reference in PWM mode Figure 1. Adjustable/fixed output voltage options via factory fuse Channel 3: high-side load switch Low R of 494 m at V = 2.5 V DS(ON) OUT3 Quick output discharge (QOD) option UVLO, OCP, and TSD protection 16-lead TSSOP EP package 40C to +125C operational junction temperature APPLICATIONS Energy (gas and water) metering Portable and battery-powered equipment Medical applications Keep-alive power supplies mode, which draws only 700 nA of quiescent current to regulate GENERAL DESCRIPTION the output under zero load and provides up to 50 mA of output The ADP5310 combines dual buck regulators and one load switch current. Hysteresis mode helps achieve excellent efficiency at less in a 16-lead TSSOP EP package that meets demanding perfor- than 1 mW and can work as a keep-alive power supply in a battery- mance and board space requirements. The device enables direct powered system. When the SYNC/MODE pin is set to high, the connection to a wide input voltage range of 2.7 V to 15.0 V, allowing buck regulator switches to a traditional constant frequency PWM the use of multiple alkaline/NiMH or lithium cells and other control scheme to provide low output ripple for noise sensitive power sources. applications, and the buck regulator provides up to 300 mA of The buck regulator in Channel 1 uses a current mode, constant output current in PWM mode. frequency pulse-width modulation (PWM) control scheme for Channel 3 integrates a high-side load switch that operates from excellent stability and transient performance, which provides up 1.65 V to 5.5 V with its input connected to the output of Channel 2. to 800 mA of output current. The automatic PWM/pulse skipping The load switch provides power domain isolation and extends mode (PSM) control scheme achieves excellent efficiency in light battery operation time. output current. A power-good signal indicates that the output Other key safety features of the ADP5310 include overcurrent of Channel 1 is within 92% of its nominal value. protection (OCP), thermal shutdown (TSD), and input under- An ultralow power buck regulator is integrated in Channel 2 with voltage lockout (UVLO). The ADP5310 is rated for the 40C the SYNC/MODE pin to control its operation mode. When to +125C junction temperature range. SYNC/MODE is set to low, the buck regulator operates in hysteresis 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 20152016 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. 2 LiMnO2 + + 13008-001ADP5310 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Soft Start ...................................................................................... 19 Applications ....................................................................................... 1 Startup with Precharged Output .............................................. 19 Typical Application Circuit ............................................................. 1 100% Duty Operation ................................................................ 19 General Description ......................................................................... 1 Active Discharge ......................................................................... 20 Revision History ............................................................................... 2 Power-Good Function ............................................................... 20 Detailed Functional Block Diagram .............................................. 3 Load Switch ................................................................................. 20 Specifications ..................................................................................... 4 Thermal Shutdown .................................................................... 20 Buck Regulators and Load Switch Specifications ..................... 5 Applications Information .............................................................. 21 Absolute Maximum Ratings ............................................................ 7 External Component Selection ................................................ 21 Thermal Resistance ...................................................................... 7 Selecting the Inductor ................................................................ 21 ESD Caution .................................................................................. 7 Output Capacitor........................................................................ 21 Pin Configuration and Function Descriptions ............................. 8 Input Capacitor ........................................................................... 21 Typical Performance Characteristics ............................................. 9 Adjustable Output Voltage Programming .............................. 22 Theory of Operation ...................................................................... 18 Efficiency ..................................................................................... 22 Buck Regulator Operation Modes ............................................ 18 Recommended Buck External Components .......................... 22 Adjustable and Fixed Output Voltages .................................... 19 Capacitor Selection .................................................................... 24 Undervoltage Lockout (UVLO) ............................................... 19 Circuit Board Layout Recommendations ............................... 24 Enable and Shutdown Features ................................................. 19 Typical Application Circuits .......................................................... 25 Internal Linear Regulator (VREG) ........................................... 19 Factory Programmable Options ................................................... 26 Oscillator and Synchronization ................................................ 19 Outline Dimensions ....................................................................... 28 Current Limit .............................................................................. 19 Ordering Guide .......................................................................... 28 Short-Circuit Protection ............................................................ 19 REVISION HISTORY 11/2016Rev. 0 to Rev. A Moved Circuit Board Layout Recommendations Section and Figure 57................................................................................... 24 Changes to Ordering Guide .......................................................... 28 4/2015Revision 0: Initial Version Rev. A Page 2 of 28