Datasheet ADP5310 (Analog Devices) - 2

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ADP5310 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 11/2016—Rev. 0 to Rev. A
Moved Circuit Board Layout Recommendations Section and Figure 57... 24 Changes to Ordering Guide .. 28
4/2015—Revision 0: Initial Version
Rev. A | Page 2 of 28 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY DETAILED FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS BUCK REGULATORS AND LOAD SWITCH SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION BUCK REGULATOR OPERATION MODES PWM Mode PSM Mode Hysteresis Mode Mode Selection ADJUSTABLE AND FIXED OUTPUT VOLTAGES UNDERVOLTAGE LOCKOUT (UVLO) ENABLE AND SHUTDOWN FEATURES INTERNAL LINEAR REGULATOR (VREG) OSCILLATOR AND SYNCHRONIZATION CURRENT LIMIT SHORT-CIRCUIT PROTECTION SOFT START STARTUP WITH PRECHARGED OUTPUT 100% DUTY OPERATION ACTIVE DISCHARGE POWER-GOOD FUNCTION LOAD SWITCH THERMAL SHUTDOWN APPLICATIONS INFORMATION EXTERNAL COMPONENT SELECTION SELECTING THE INDUCTOR OUTPUT CAPACITOR INPUT CAPACITOR ADJUSTABLE OUTPUT VOLTAGE PROGRAMMING EFFICIENCY Power Switch Conduction Losses Inductor Losses Driver Losses Transition Losses RECOMMENDED BUCK EXTERNAL COMPONENTS CAPACITOR SELECTION Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties CIRCUIT BOARD LAYOUT RECOMMENDATIONS TYPICAL APPLICATION CIRCUITS FACTORY PROGRAMMABLE OPTIONS OUTLINE DIMENSIONS ORDERING GUIDE