Datasheet ADP5054 (Analog Devices) - 2

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ADP5054 Data Sheet TABLE OF CONTENTS
Features .. 1 Power-Good Function ... 20 Applications ... 1 Thermal Shutdown .. 20 Typical Application Circuit ... 1 Applications Information .. 21 General Description ... 1 ADIsimPower Design Tool ... 21 Revision History ... 3 Programming the Output Voltage ... 21 Detailed Functional Block Diagram .. 4 Voltage Conversion Limitations ... 21 Specifications ... 5 Current-Limit Setting .. 21 Buck Regulator Specifications .. 6 Soft Start Setting ... 22  Absolute Maximum Ratings .. 8 Inductor Selection .. 22 Thermal Resistance .. 8 Output Capacitor Selection ... 22 ESD Caution .. 8 Input Capacitor Selection .. 23 Pin Configuration and Function Descriptions ... 9 Low-Side Power Device Selection .. 23 Typical Performance Characteristics ... 11 Programming the UVLO Input .. 23 Theory of Operation .. 15 Compensation Components Design ... 24 Buck Regulator Operational Modes ... 15 Power Dissipation... 24 Adjustable and Fixed Output Voltage .. 15 Junction Temperature .. 25 Internal Regulators (VREG and VDD) ... 15 Design Examples .. 26 Separate Supply Applications .. 16 Setting the Switching Frequency .. 26 Low-Side Device Selection .. 16 Setting the Output Voltage .. 26 Bootstrap Circuitry .. 16 Setting the Current Limit .. 26 Active Output Discharge Switch .. 16 Selecting the Inductor .. 26 Precision Enabling .. 16 Selecting the Output Capacitor .. 27 Oscillator ... 16 Selecting the Low-Side MOSFET ... 27 Synchronization Input/Output ... 17 Designing the Compensation Network ... 27 Soft Start .. 18 Selecting the Soft Start Time... 27 Parallel Operation... 18 Selecting the Input Capacitor ... 27 Startup with Precharged Output .. 19 Printed Circuit Board Layout Recommendations ... 28 Current-Limit Protection .. 19 Typical Application Circuit ... 29 Frequency Foldback ... 19 Factory Default Options .. 30 Pulse Skip in Maximum Duty ... 19 Outline Dimensions ... 31 Short-Circuit Protection (SCP) .. 20 Ordering Guide .. 31 Latch-Off Protection .. 20 Undervoltage Lockout (UVLO) ... 20 Rev. G | Page 2 of 31 Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY DETAILED FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS BUCK REGULATOR SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION BUCK REGULATOR OPERATIONAL MODES PWM Mode PSM Mode Forced PWM and Automatic PWM/PSM Modes ADJUSTABLE AND FIXED OUTPUT VOLTAGE 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 IN MAXIMUM DUTY SHORT-CIRCUIT PROTECTION (SCP) LATCH-OFF PROTECTION Short-Circuit Latch-Off Mode UNDERVOLTAGE LOCKOUT (UVLO) POWER-GOOD FUNCTION THERMAL SHUTDOWN APPLICATIONS INFORMATION ADIsimPOWER DESIGN TOOL PROGRAMMING THE 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 EXAMPLES 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 PRINTED CIRCUIT BOARD LAYOUT RECOMMENDATIONS TYPICAL APPLICATION CIRCUIT FACTORY DEFAULT OPTIONS OUTLINE DIMENSIONS ORDERING GUIDE