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ADP1875-0.3-EVALZ Datasheet(PDF) 2 Page - Analog Devices |
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ADP1875-0.3-EVALZ Datasheet(HTML) 2 Page - Analog Devices |
2 / 44 page ADP1874/ADP1875 Rev. 0 | Page 2 of 44 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Typical Applications Circuit............................................................ 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 6 Thermal Resistance ...................................................................... 6 Boundary Condition .................................................................... 6 ESD Caution.................................................................................. 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 8 ADP1874/ADP1875 Block Digram.............................................. 18 Theory of Operation ...................................................................... 19 Startup.......................................................................................... 19 Soft Start ...................................................................................... 19 Precision Enable Circuitry ........................................................ 19 Undervoltage Lockout ............................................................... 19 On-Board Low Dropout Regulator.......................................... 20 Thermal Shutdown..................................................................... 20 Programming Resistor (RES) Detect Circuit.......................... 20 Valley Current-Limit Setting .................................................... 20 Hiccup Mode During Short Circuit......................................... 22 Synchronous Rectifier................................................................ 22 ADP1875 Power Saving Mode (PSM) ..................................... 22 Timer Operation ........................................................................ 23 Pseudo-Fixed Frequency ........................................................... 24 Power Good Monitoring ........................................................... 24 Voltage Tracking......................................................................... 25 Applications Information .............................................................. 27 Feedback Resistor Divider ........................................................ 27 Inductor Selection ...................................................................... 27 Output Ripple Voltage (ΔVRR) .................................................. 27 Output Capacitor Selection....................................................... 27 Compensation Network ............................................................ 28 Efficiency Consideration........................................................... 29 Input Capacitor Selection.......................................................... 30 Thermal Considerations............................................................ 31 Design Example.......................................................................... 32 External Component Recommendations.................................... 34 Layout Considerations................................................................... 36 IC Section (Left Side of Evaluation Board)............................. 38 Power Section ............................................................................. 38 Differential Sensing.................................................................... 39 Typical Application Circuits ......................................................... 40 12 A, 300 kHz High Current Application Circuit.................. 40 5.5 V Input, 600 kHz Application Circuit ............................... 40 300 kHz High Current Application Circuit ............................ 41 Outline Dimensions ....................................................................... 42 Ordering Guide .......................................................................... 42 REVISION HISTORY 2/11—Revision 0: Initial Version |
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