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データシートサーチシステム |
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Si4842DY データシート(PDF) 2 Page - Analog Devices |
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Si4842DY データシート(HTML) 2 Page - Analog Devices |
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2 / 40 page  ADP1878/ADP1879 Data Sheet Rev. A | Page 2 of 40 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Typical Applications Circuit............................................................ 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings ....................................................... 5 Thermal Resistance ...................................................................... 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ............................................. 7 Theory of Operation ...................................................................... 17 Block Diagram ............................................................................ 17 Startup.......................................................................................... 18 Soft Start ...................................................................................... 18 Precision Enable Circuitry ........................................................ 18 Undervoltage Lockout ............................................................... 18 On-Board Low Dropout (LDO) Regulator............................. 18 Thermal Shutdown..................................................................... 19 Programming Resistor (RES) Detect Circuit.......................... 19 Valley Current-Limit Setting .................................................... 19 Hiccup Mode During Short Circuit......................................... 21 Synchronous Rectifier................................................................ 21 ADP1879 Power Saving Mode (PSM)...................................... 21 Timer Operation......................................................................... 22 Pseudo Fixed Frequency............................................................ 22 Power-Good Monitoring........................................................... 23 Applications Information .............................................................. 24 Feedback Resistor Divider ........................................................ 24 Inductor Selection ...................................................................... 24 Output Ripple Voltage (ΔVRR) .................................................. 24 Output Capacitor Selection....................................................... 24 Compensation Network ............................................................ 25 Efficiency Consideration........................................................... 26 Input Capacitor Selection.......................................................... 27 Thermal Considerations............................................................ 27 Design Example.......................................................................... 29 External Component Recommendations.................................... 31 Layout Considerations................................................................... 33 IC Section (Left Side of Evaluation Board)............................. 35 Power Section ............................................................................. 35 Differential Sensing.................................................................... 36 Typical Application Circuits ......................................................... 37 12 A, 300 kHz High Current Application Circuit.................. 37 5.5 V Input, 600 kHz Current Application Circuit ................ 37 300 kHz High Current Application Circuit ............................ 38 Packaging and Ordering Information ......................................... 39 Outline Dimensions................................................................... 39 Ordering Guide .......................................................................... 40 REVISION HISTORY 6/12—Rev. 0 to Rev. A Changes to Table 1.............................................................................3 7/11—Revision 0: Initial Version |
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