Datasheet ADP2105, ADP2106, ADP2107 (Analog Devices) - 2

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ADP2105/ADP2106/ADP2107 Data Sheet TABLE OF CONTENTS
Features .. 1 External Component Selection .. 17 Applications ... 1 Setting the Output Voltage .. 17 General Description ... 1 Inductor Selection .. 18 Typical Operating Circuit .. 1 Output Capacitor Selection... 19 Revision History ... 3 Input Capacitor Selection .. 20 Functional Block Diagram .. 4 Input Filter ... 20 Specifications ... 5 Soft Start Period .. 20 Absolute Maximum Ratings .. 7 Loop Compensation .. 20 Thermal Resistance .. 7 Bode Plots .. 21 Boundary Condition .. 7 Load Transient Response .. 22 ESD Caution .. 7 Efficiency Considerations ... 24 Pin Configuration and Function Descriptions ... 8 Thermal Considerations .. 24 Typical Performance Characteristics ... 9 Design Example .. 26 Theory of Operation .. 15 External Component Recommendations .. 27 Control Scheme .. 15 Circuit Board Layout Recommendations ... 29 PWM Mode Operation .. 15 Evaluation Board .. 30 PFM Mode Operation .. 15 Evaluation Board Schematic for ADP2107 (1.8 V) ... 30 Pulse-Skipping Threshold ... 15 Recommended PCB Board Layout (Evaluation Board 100% Duty Cycle Operation (LDO Mode) ... 15 Layout) ... 30 Slope Compensation .. 16 Application Circuits ... 32 Design Features ... 16 Outline Dimensions ... 34 Applications Information .. 17 Ordering Guide .. 34 Rev. E | Page 2 of 36 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL OPERATING CIRCUIT REVISION HISTORY FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE BOUNDARY CONDITION ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL SCHEME PWM MODE OPERATION PFM MODE OPERATION PULSE-SKIPPING THRESHOLD 100% DUTY CYCLE OPERATION (LDO MODE) DESIGN FEATURES Enable/Shutdown Synchronous Rectification Current Limit Short-Circuit Protection Undervoltage Lockout (UVLO) Thermal Protection Soft Start APPLICATIONS INFORMATION ADIsimPower DESIGN TOOL EXTERNAL COMPONENT SELECTION SETTING THE OUTPUT VOLTAGE INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION INPUT CAPACITOR SELECTION INPUT FILTER SOFT START PERIOD LOOP COMPENSATION BODE PLOTS LOAD TRANSIENT RESPONSE EFFICIENCY CONSIDERATIONS Power Switch Conduction Losses Inductor Losses Switching Losses Transition Losses THERMAL CONSIDERATIONS DESIGN EXAMPLE EXTERNAL COMPONENT RECOMMENDATIONS CIRCUIT BOARD LAYOUT RECOMMENDATIONS EVALUATION BOARD EVALUATION BOARD SCHEMATIC FOR ADP2107 (1.8 V) RECOMMENDED PCB LAYOUT (EVALUATION BOARD LAYOUT) APPLICATION CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE