Datasheet

ADP5052 Data Sheet
Rev. 0 | Page 2 of 40
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Typical Application Circuit ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Detailed Functional Block Diagram .............................................. 3
Specifications ..................................................................................... 4
Buck Regulator Specifications .................................................... 5
LDO Regulator Specifications .................................................... 7
Absolute Maximum Ratings ............................................................ 8
Thermal Resistance ...................................................................... 8
ESD Caution .................................................................................. 8
Pin Configuration and Function Descriptions ............................. 9
Typical Performance Characteristics ........................................... 11
Theory of Operation ...................................................................... 17
Buck Regulator Operational Modes ......................................... 17
Adjustable and Fixed Output Voltages .................................... 17
Internal Regulators (VREG and VDD) ................................... 17
Separate Supply Applications .................................................... 18
Low-Side Device Selection ........................................................ 18
Bootstrap Circuitry .................................................................... 18
Active Output Discharge Switch .............................................. 18
Precision Enabling ...................................................................... 18
Oscillator ..................................................................................... 18
Synchronization Input/Output ................................................. 19
Soft Start ...................................................................................... 19
Parallel Operation....................................................................... 20
Startup with Precharged Output .............................................. 20
Current-Limit Protection .......................................................... 20
Frequency Foldback ................................................................... 21
Hiccup Protection ...................................................................... 21
Latch-Off Protection .................................................................. 21
Undervoltage Lockout (UVLO) ............................................... 22
Power-Good Function ............................................................... 22
Thermal Shutdown .................................................................... 22
LDO Regulator ........................................................................... 22
Applications Information .............................................................. 23
ADIsimPower Design Tool ....................................................... 23
Programming the Adjustable Output Voltage ........................ 23
Voltage Conversion Limitations ............................................... 23
Current-Limit Setting ................................................................ 23
Soft Start Setting ......................................................................... 24
Inductor Selection ...................................................................... 24
Output Capacitor Selection....................................................... 24
Input Capacitor Selection .......................................................... 25
Low-Side Power Device Selection ............................................ 25
Programming the UVLO Input ................................................ 25
Compensation Components Design ....................................... 26
Power Dissipation....................................................................... 26
Junction Temperature ................................................................ 27
Design Example .............................................................................. 28
Setting the Switching Frequency .............................................. 28
Setting the Output Voltage ........................................................ 28
Setting the Current Limit .......................................................... 28
Selecting the Inductor ................................................................ 28
Selecting the Output Capacitor ................................................ 29
Selecting the Low-Side MOSFET ............................................. 29
Designing the Compensation Network ................................... 29
Selecting the Soft Start Time..................................................... 29
Selecting the Input Capacitor ................................................... 29
Recommended External Components .................................... 30
Circuit Board Layout Recommendations ................................... 31
Typical Application Circuits ......................................................... 32
Factory Programmable Options ................................................... 35
Factory Default Options ............................................................ 37
Outline Dimensions ....................................................................... 38
Ordering Guide .......................................................................... 38
REVISION HISTORY
5/13—Revision 0: Initial Version