link to page 1 link to page 1 link to page 1 link to page 1 link to page 2 link to page 3 link to page 5 link to page 5 link to page 5 link to page 6 link to page 7 link to page 12 link to page 13 link to page 13 link to page 13 link to page 13 link to page 13 link to page 13 link to page 13 link to page 13 link to page 14 link to page 14 link to page 14 link to page 14 link to page 14 link to page 15 link to page 15 link to page 15 link to page 15 link to page 15 link to page 17 link to page 17 link to page 18 link to page 18 link to page 19 link to page 20 link to page 20 link to page 20 link to page 20 link to page 20 link to page 21 link to page 21 link to page 21 link to page 21 link to page 21 link to page 23 link to page 25 link to page 27 link to page 28 link to page 28 ADP2381Data SheetTABLE OF CONTENTS Features .. 1 Applications Information .. 15 Applications ... 1 Input Capacitor Selection .. 15 Typical Applications Circuit .. 1 Output Voltage Setting .. 15 General Description ... 1 Voltage Conversion Limitations ... 15 Revision History ... 2 Inductor Selection .. 15 Specifications ... 3 Output Capacitor Selection... 17 Absolute Maximum Ratings .. 5 Low-Side Power Device Selection .. 17 Thermal Information ... 5 Programming Input Voltage UVLO .. 18 ESD Caution .. 5 Compensation Design ... 18 Pin Configuration and Function Description .. 6 ADIsimPower Design Tool ... 19 Typical Performance Characteristics ... 7 Design Example .. 20 Functional Block Diagram .. 12 Output Voltage Setting .. 20 Theory of Operation .. 13 Frequency Setting ... 20 Control Scheme .. 13 Inductor Selection .. 20 Internal Regulator (VREG) ... 13 Output Capacitor Selection... 20 Bootstrap Circuitry .. 13 Low-Side MOSFET Selection ... 21 Low-Side Driver .. 13 Compensation Components ... 21 Oscillator ... 13 Soft Start Time Program ... 21 Synchronization .. 13 Input Capacitor Selection .. 21 Enable and Soft Start .. 13 Schematic for Design Example ... 21 Power Good ... 14 External Components Recommendation .. 23 Peak Current Limit and Short-Circuit Protection ... 14 Circuit Board Layout Recommendations ... 25 Overvoltage Protection (OVP) ... 14 Typical Application Circuits ... 27 Undervoltage Lockout (UVLO) .. 14 Outline Dimensions ... 28 Thermal Shutdown ... 14 Ordering Guide .. 28 REVISION HISTORY 3/12—Revision 0: Initial Version Rev. 0 | Page 2 of 28 Document Outline Features Applications Typical Applications Circuit General Description Revision History Specifications Absolute Maximum Ratings Thermal Information ESD Caution Pin Configuration and Function Description Typical Performance Characteristics Functional Block Diagram Theory of Operation Control Scheme Internal Regulator (VREG) Bootstrap Circuitry Low-Side Driver Oscillator Synchronization Enable and Soft Start Power Good Peak Current Limit and Short-Circuit Protection Overvoltage Protection (OVP) Undervoltage Lockout (UVLO) Thermal Shutdown Applications Information Input Capacitor Selection Output Voltage Setting Voltage Conversion Limitations Inductor Selection Output Capacitor Selection Low-Side Power Device Selection Programming Input Voltage UVLO Compensation Design Compensation Network Between COMP and GND Compensation Network Between COMP and FB ADIsimPower Design Tool Design Example Output Voltage Setting Frequency Setting Inductor Selection Output Capacitor Selection Low-Side MOSFET Selection Compensation Components Soft Start Time Program Input Capacitor Selection Schematic of Design Example External Components Recommendation Circuit Board Layout Recommendations Typical Application Circuits Outline Dimensions Ordering Guide
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