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ADP1822 Datasheet(PDF) 2 Page - Analog Devices

Part No. ADP1822
Description  PWM, Step-Down DC-to-DC Controller with Margining and Tracking
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP1822 Datasheet(HTML) 2 Page - Analog Devices

 
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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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