ADP1882/ADP1883
TABLE OF CONTENTS
Features .............................................................................................. 1
Timer Operation ........................................................................ 22
Pseudo-Fixed Frequency........................................................... 23
Applications Information.............................................................. 24
Feedback Resistor Divider ........................................................ 24
Inductor Selection...................................................................... 24
Output Ripple Voltage (ΔVRR) .................................................. 24
Output Capacitor Selection....................................................... 24
Compensation Network ............................................................ 25
Efficiency Considerations ......................................................... 26
Input Capacitor Selection.......................................................... 27
Thermal Considerations............................................................ 28
Design Example.......................................................................... 28
External Component Recommendations.................................... 31
Layout Considerations................................................................... 33
IC Section (Left Side of Evaluation Board)............................. 36
Power Section ............................................................................. 36
Differential Sensing.................................................................... 36
Typical Applications Circuits........................................................ 37
Dual-Input, 300 kHz High Current Applications Circuit..... 37
Single-Input, 600 kHz Applications Circuit ........................... 37
Dual-Input, 300 kHz High Current Applications Circuit..... 38
Outline Dimensions....................................................................... 39
Ordering Guide .......................................................................... 39
Applications....................................................................................... 1
Typical Applications Circuit............................................................ 1
General Description......................................................................... 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
ADP1882/ADP1883 Block Diagram............................................ 18
Theory of Operation ...................................................................... 19
Startup.......................................................................................... 19
Soft Start ...................................................................................... 19
Precision Enable Circuitry ........................................................ 19
Undervoltage Lockout ............................................................... 19
Thermal Shutdown..................................................................... 19
Programming Resistor (RES) Detect Circuit.......................... 20
Valley Current-Limit Setting .................................................... 20
Hiccup Mode During Short Circuit......................................... 21
Synchronous Rectifier................................................................ 22
Power Saving Mode (PSM) Version (ADP1883).................... 22
REVISION HISTORY
4/10—Revision 0: Initial Version
Rev. 0 | Page 2 of 40
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