Datasheet

ADP5050 Data Sheet
Rev. 0 | Page 2 of 60
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Typical Application Circuit ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 3
Detailed Functional Block Diagram .............................................. 4
Specifications ..................................................................................... 5
Buck Regulator Specifications .................................................... 6
LDO Regulator Specifications .................................................... 8
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C Interface Timing Specifications ........................................... 9
Absolute Maximum Ratings .......................................................... 10
Thermal Resistance .................................................................... 10
ESD Caution ................................................................................ 10
Pin Configuration and Function Descriptions ........................... 11
Typical Performance Characteristics ........................................... 13
Theory of Operation ...................................................................... 19
Buck Regulator Operational Modes ......................................... 19
Adjustable and Fixed Output Voltages .................................... 20
Dynamic Voltage Scaling (DVS) .............................................. 20
Internal Regulators (VREG and VDD) ................................... 20
Separate Supply Applications .................................................... 20
Low-Side Device Selection ........................................................ 21
Bootstrap Circuitry .................................................................... 21
Active Output Discharge Switch .............................................. 21
Precision Enabling ...................................................................... 21
Oscillator ..................................................................................... 21
Synchronization Input/Output ................................................. 22
Soft Start ...................................................................................... 23
Parallel Operation....................................................................... 23
Startup with Precharged Output .............................................. 23
Current-Limit Protection .......................................................... 24
Frequency Foldback ................................................................... 24
Hiccup Protection ...................................................................... 24
Latch-Off Protection .................................................................. 24
Undervoltage Lockout (UVLO) ............................................... 25
Power-Good Function ............................................................... 25
Interrupt Function ...................................................................... 25
Thermal Shutdown .................................................................... 26
Overheat Detection .................................................................... 26
Low Input Voltage Detection .................................................... 26
LDO Regulator ........................................................................... 26
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C Interface .................................................................................... 27
SDA and SCL Pins ...................................................................... 27
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C Addresses .............................................................................. 27
Self-Clear Register Bits .............................................................. 27
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C Interface Timing Diagrams ................................................ 28
Applications Information .............................................................. 29
ADIsimPower Design Tool ....................................................... 29
Programming the Adjustable Output Voltage ........................ 29
Voltage Conversion Limitations ............................................... 29
Current-Limit Setting ................................................................ 29
Soft Start Setting ......................................................................... 30
Inductor Selection ...................................................................... 30
Output Capacitor Selection....................................................... 30
Input Capacitor Selection .......................................................... 31
Low-Side Power Device Selection ............................................ 31
Programming the UVLO Input ................................................ 31
Compensation Components Design ....................................... 32
Power Dissipation....................................................................... 32
Junction Temperature ................................................................ 33
Design Example .............................................................................. 34
Setting the Switching Frequency .............................................. 34
Setting the Output Voltage ........................................................ 34
Setting the Current Limit .......................................................... 34
Selecting the Inductor ................................................................ 34
Selecting the Output Capacitor ................................................ 35
Selecting the Low-Side MOSFET ............................................. 35
Designing the Compensation Network ................................... 35
Selecting the Soft Start Time..................................................... 35
Selecting the Input Capacitor ................................................... 35
Recommended External Components .................................... 36
Circuit Board Layout Recommendations ................................... 37
Typical Application Circuits ......................................................... 38
Register Map ................................................................................... 41