ADP1878/ADP1879
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Pseudo Fixed Frequency............................................................ 22
Power-Good Monitoring........................................................... 23
Applications Information.............................................................. 24
Feedback Resistor Divider ........................................................ 24
Inductor Selection...................................................................... 24
Output Ripple Voltage (ΔVRR) .................................................. 24
Output Capacitor Selection....................................................... 24
Compensation Network ............................................................ 25
Efficiency Consideration........................................................... 26
Input Capacitor Selection.......................................................... 27
Thermal Considerations............................................................ 27
Design Example.......................................................................... 29
External Component Recommendations.................................... 31
Layout Considerations................................................................... 33
IC Section (Left Side of Evaluation Board)............................. 35
Power Section ............................................................................. 35
Differential Sensing.................................................................... 36
Typical Application Circuits ......................................................... 37
12 A, 300 kHz High Current Application Circuit.................. 37
5.5 V Input, 600 kHz Current Application Circuit................ 37
300 kHz High Current Application Circuit............................ 38
Packaging and Ordering Information ......................................... 39
Outline Dimensions................................................................... 39
Ordering Guide .......................................................................... 40
Applications....................................................................................... 1
Typical Applications Circuit............................................................ 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings ....................................................... 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 17
Block Diagram ............................................................................ 17
Startup.......................................................................................... 18
Soft Start ...................................................................................... 18
Precision Enable Circuitry ........................................................ 18
Undervoltage Lockout ............................................................... 18
On-Board Low Dropout (LDO) Regulator............................. 18
Thermal Shutdown..................................................................... 19
Programming Resistor (RES) Detect Circuit.......................... 19
Valley Current-Limit Setting .................................................... 19
Hiccup Mode During Short Circuit......................................... 21
Synchronous Rectifier................................................................ 21
ADP1879 Power Saving Mode (PSM)...................................... 21
Timer Operation......................................................................... 22
REVISION HISTORY
6/12—Rev. 0 to Rev. A
Changes to Table 1.............................................................................3
7/11—Revision 0: Initial Version
Rev. A | Page 2 of 40
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