Datasheet ADP5053 (Analog Devices) - 2

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ADP5053 Data Sheet TABLE OF CONTENTS
Features .. 1 Power-Good Function ... 22 Applications ... 1 Thermal Shutdown .. 22 Typical Application Circuit ... 1 Supervisory Circuit .. 22 General Description ... 1 Applications Information .. 24 Revision History ... 3 ADIsimPower Design Tool ... 24 Detailed Functional Block Diagram .. 4 Programming the Adjustable Output Voltage .. 24 Specifications ... 5 Voltage Conversion Limitations ... 24 Buck Regulator Specifications .. 6 Current-Limit Setting .. 24 Supervisory Specifications .. 8 Soft Start Setting ... 25 Absolute Maximum Ratings .. 9 Inductor Selection .. 25 Thermal Resistance .. 9 Output Capacitor Selection... 25 ESD Caution .. 9 Input Capacitor Selection .. 26 Pin Configuration and Function Descriptions ... 10 Low-Side Power Device Selection .. 26 Typical Performance Characteristics ... 12 Programming the UVLO Input .. 26 Theory of Operation .. 17 Compensation Components Design ... 27 Buck Regulator Operational Modes ... 17 Power Dissipation... 27 Adjustable and Fixed Output Voltages .. 17 Junction Temperature .. 28 Internal Regulators (VREG and VDD) ... 17 Design Example .. 29 Separate Supply Applications .. 18 Setting the Switching Frequency .. 29 Low-Side Device Selection .. 18 Setting the Output Voltage .. 29 Bootstrap Circuitry .. 18 Setting the Current Limit .. 29 Active Output Discharge Switch .. 18 Selecting the Inductor .. 29 Precision Enabling .. 18 Selecting the Output Capacitor .. 30 Oscillator ... 18 Selecting the Low-Side MOSFET ... 30 Synchronization Input/Output ... 19 Designing the Compensation Network ... 30 Soft Start .. 19 Selecting the Soft Start Time... 30 Parallel Operation... 20 Selecting the Input Capacitor ... 30 Startup with Precharged Output .. 20 Recommended External Components .. 31 Current-Limit Protection .. 20 Circuit Board Layout Recommendations ... 32 Frequency Foldback ... 21 Typical Application Circuits ... 33 Hiccup Protection .. 21 Factory Default Options .. 36 Latch-Off Protection .. 21 Outline Dimensions ... 37 Undervoltage Lockout (UVLO) ... 22 Ordering Guide .. 37 Rev. C | Page 2 of 37 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY DETAILED FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS BUCK REGULATOR SPECIFICATIONS SUPERVISORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION BUCK REGULATOR OPERATIONAL MODES Pulse-Width Modulation (PWM) Mode Power Save Mode (PSM) Forced PWM and Automatic PWM/PSM Modes ADJUSTABLE AND FIXED OUTPUT VOLTAGES INTERNAL REGULATORS (VREG AND VDD) SEPARATE SUPPLY APPLICATIONS LOW-SIDE DEVICE SELECTION BOOTSTRAP CIRCUITRY ACTIVE OUTPUT DISCHARGE SWITCH PRECISION ENABLING OSCILLATOR Phase Shift SYNCHRONIZATION INPUT/OUTPUT SOFT START PARALLEL OPERATION STARTUP WITH PRECHARGED OUTPUT CURRENT-LIMIT PROTECTION FREQUENCY FOLDBACK Pulse Skip Mode Under Maximum Duty Cycle HICCUP PROTECTION LATCH-OFF PROTECTION Short-Circuit Latch-Off Mode Overvoltage Latch-Off Mode UNDERVOLTAGE LOCKOUT (UVLO) POWER-GOOD FUNCTION THERMAL SHUTDOWN SUPERVISORY CIRCUIT Reset Output Watchdog Input Manual Reset Input Processor Manual Reset Mode Power On/Off Switch Mode APPLICATIONS INFORMATION ADIsimPower DESIGN TOOL PROGRAMMING THE ADJUSTABLE OUTPUT VOLTAGE VOLTAGE CONVERSION LIMITATIONS CURRENT-LIMIT SETTING SOFT START SETTING INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION INPUT CAPACITOR SELECTION LOW-SIDE POWER DEVICE SELECTION PROGRAMMING THE UVLO INPUT COMPENSATION COMPONENTS DESIGN POWER DISSIPATION Buck Regulator Power Dissipation Power Switch Conduction Loss (PCOND) Switching Loss (PSW) Transition Loss (PTRAN) Thermal Shutdown JUNCTION TEMPERATURE DESIGN EXAMPLE SETTING THE SWITCHING FREQUENCY SETTING THE OUTPUT VOLTAGE SETTING THE CURRENT LIMIT SELECTING THE INDUCTOR SELECTING THE OUTPUT CAPACITOR SELECTING THE LOW-SIDE MOSFET DESIGNING THE COMPENSATION NETWORK SELECTING THE SOFT START TIME SELECTING THE INPUT CAPACITOR RECOMMENDED EXTERNAL COMPONENTS CIRCUIT BOARD LAYOUT RECOMMENDATIONS TYPICAL APPLICATION CIRCUITS FACTORY DEFAULT OPTIONS OUTLINE DIMENSIONS ORDERING GUIDE