Datasheet ADP2105, ADP2106, ADP2107 (Analog Devices) - 3

Data Sheet ADP2105/ADP2106/ADP2107 REVISION HISTORY 3/07—Rev. 0 to Rev. A
Updated Format ... Universal
4/16—Rev. D to Rev. E
Changes to Output Characteristics and Changed LFCSP_VQ to LFCSP ... Throughout LX (Switch Node) Characteristics Sections ... 3 Change to Figure 4 .. 8 Updated Outline Dimensions .. 34 Changes to Typical Performance Characteristics Section ... 7 Changes to Load Transient Response Section ... 21 Changes to Ordering Guide ... 34
7/06—Revision 0: Initial Version 8/12—Rev. C to Rev. D
Change to Features Section .. 1 Added Exposed Pad Notation to Pin Configuration and Function Description Section .. 7 Added ADIsimPower Design Tool Section ... 16 Updated Outline Dimensions .. 33
9/08—Rev. B to Rev. C
Changes to Table Summary Statement ... 4 Changes to LX Minimum On-Time Parameter, Table 1 .. 5
7/08—Rev. A to Rev. B
Changes to General Description Section ... 1 Changes to Figure 3 ... 3 Changes to Table 1 .. 4 Changes to Table 2 .. 6 Changes to Figure 4 ... 7 Changes to Table 4 .. 7 Changes to Figure 26 .. 11 Changes to Figure 31 Through Figure 34 .. 12 Changes to Figure 35 .. 13 Changes to PMW Mode Operation Section and Pulse Skipping Threshold Section ... 14 Changes to Slope Compensation Section .. 15 Changes to Setting the Output Voltage Section ... 16 Changes to Figure 37 .. 16 Changes to Inductor Selection Section .. 17 Changes to Input Capacitor Selection Section .. 18 Changes to Figure 47 through Figure 52 .. 21 Changes to Transition Losses Section and Thermal Considerations Section ... 22 Changes to Table 11 .. 25 Changes to Circuit Board Layout Recommendations Section..27 Changes to Table 12 .. 26 Changes to Figure 53 .. 28 Changes to Figure 56 Through Figure 57 .. 30 Changes to Figure 58 Through Figure 59 .. 31 Changes to Outline Dimensions ... 33 Rev. E | Page 3 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