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ADP1822 Datasheet(PDF) 2 Page - Analog Devices |
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ADP1822 Datasheet(HTML) 2 Page - Analog Devices |
2 / 24 page ADP1822 Rev. B | Page 2 of 24 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Simplified Block Diagram ............................................................... 6 Pin Configuration and Function Descriptions............................. 7 Typical Performance Characteristics ............................................. 9 Theory of Operation ...................................................................... 12 Current-Limit Scheme............................................................... 12 Output Voltage Margining ........................................................ 12 Output Voltage Tracking ........................................................... 12 Soft Start ...................................................................................... 12 High-Side Driver (BST and DH).............................................. 13 Low-Side Driver (DL) ................................................................ 13 Input Voltage Range ................................................................... 13 Setting the Output Voltage ........................................................ 13 Switching Frequency Control ................................................... 13 Compensation............................................................................. 13 Power-Good Indicator............................................................... 13 Shutdown Control...................................................................... 13 Application Information................................................................ 14 Selecting the Input Capacitor ................................................... 14 Output LC Filter ......................................................................... 14 Selecting the MOSFETS ............................................................ 15 Setting the Current Limit .......................................................... 15 Feedback Voltage Divider ......................................................... 16 Setting the Voltage Margin........................................................ 16 Compensating the Regulator .................................................... 16 Setting the Soft Start Period...................................................... 19 Synchronizing the Converter.................................................... 19 Setting the Output Voltage Tracking ....................................... 19 Application Circuits ....................................................................... 20 Outline Dimensions ....................................................................... 21 Ordering Guide .......................................................................... 21 REVISION HISTORY 8/06—Rev. A to Rev. B Change to Title.................................................................................. 1 Change to General Description ...................................................... 1 Changes to Figure 6.......................................................................... 9 Changes to Output Voltage Margining Section.......................... 12 Changes to Table 4.......................................................................... 12 1/06—Rev. 0 to Rev. A Changes to Figure 1.......................................................................... 1 Changes to Table 1............................................................................ 3 Changes to Input Voltage Range Section .................................... 13 Changes to Selecting the Input Capacitor Section ..................... 14 Added Equation 1; Renumbered Sequentially............................ 14 Changes to Equation 7 and Equation 8 ....................................... 15 Changes to Selecting the MOSFETS Section .............................. 15 Added Equation 9; Renumbered Sequentially ........................... 15 Changes to Equation 10................................................................. 15 Changes to Equation 22................................................................. 17 Changes to Compensating the Regulator Section...................... 17 Changes to Figure 19 and Figure 20............................................. 17 Changes to Equation 27................................................................. 17 Changes to Equation 34................................................................. 18 7/05—Revision 0: Initial Version |
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