ADP2105/ADP2106/ADP2107
TABLE OF CONTENTS
Features .............................................................................................. 1
Setting the Output Voltage........................................................ 15
Inductor Selection...................................................................... 16
Output Capacitor Selection....................................................... 17
Input Capacitor Selection.......................................................... 17
Input Filter................................................................................... 18
Soft Start ...................................................................................... 18
Loop Compensation .................................................................. 18
Bode Plots.................................................................................... 19
Load Transient Response .......................................................... 20
Efficiency Considerations ......................................................... 21
Thermal Considerations............................................................ 21
Design Example.......................................................................... 22
External Component Recommendations.................................... 24
Circuit Board Layout Recommendations ................................... 26
Evaluation Board ............................................................................ 27
Evaluation Board Schematic (ADP2107-1.8V)...................... 27
Applications....................................................................................... 1
General Description......................................................................... 1
Typical Performance Characteristics ............................................. 1
Typical Operating Circuit................................................................ 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
Boundary Condition.................................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 12
Control Scheme .......................................................................... 12
PWM Mode Operation.............................................................. 12
PFM Mode Operation................................................................ 12
Pulse-Skipping Threshold ......................................................... 12
100% Duty Cycle Operation (LDO Mode)............................. 12
Slope Compensation .................................................................. 13
Features........................................................................................ 13
Applications Information .............................................................. 15
External Component Selection................................................. 15
Recommended PCB Board Layout
(Evaluation Board Layout)........................................................ 27
Application Circuits ....................................................................... 29
Outline Dimensions....................................................................... 31
Ordering Guide .......................................................................... 31
REVISION HISTORY
7/06—Revision 0: Initial Version
Rev. 0 | Page 2 of 32
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