ADP5054

Data Sheet

Rev. B | Page 2 of 31

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

Absolute Maximum Ratings............................................................ 7

Thermal Resistance ...................................................................... 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Typical Performance Characteristics ........................................... 10

Theory of Operation ...................................................................... 14

Buck Regulator Operational Modes......................................... 14

Adjustable and Fixed Output Voltage...................................... 14

Internal Regulators (VREG and VDD) ................................... 14

Separate Supply Applications.................................................... 15

Low-Side Device Selection........................................................ 15

Bootstrap Circuitry .................................................................... 15

Active Output Discharge Switch .............................................. 15

Precision Enabling...................................................................... 15

Oscillator ..................................................................................... 15

Synchronization Input/Output ................................................. 16

Soft Start ...................................................................................... 17

Parallel Operation....................................................................... 17

Startup with Precharged Output .............................................. 18

Current-Limit Protection .......................................................... 18

Frequency Foldback ................................................................... 18

Pulse Skip in Maximum Duty................................................... 18

Short-Circuit Protection (SCP) ................................................ 18

Latch-Off Protection.................................................................. 19

Undervoltage Lockout (UVLO) ............................................... 19

Power-Good Function............................................................... 19

Thermal Shutdown .................................................................... 19

Applications Information .............................................................. 20

ADIsimPower Design Tool ....................................................... 20

Programming the Output Voltage ........................................... 20

Voltage Conversion Limitations............................................... 20

Current-Limit Setting ................................................................ 20

Soft Start Setting......................................................................... 21

Inductor Selection ...................................................................... 21

Output Capacitor Selection....................................................... 21

Input Capacitor Selection.......................................................... 22

Low-Side Power Device Selection............................................ 22

Programming the UVLO Input................................................ 22

Compensation Components Design ....................................... 23

Power Dissipation....................................................................... 23

Junction Temperature ................................................................ 24

Design Examples ............................................................................ 25

Setting the Switching Frequency.............................................. 25

Setting the Output Voltage........................................................ 25

Setting the Current Limit .......................................................... 25

Selecting the Inductor................................................................ 25

Selecting the Output Capacitor ................................................ 26

Selecting the Low-Side MOSFET............................................. 26

Designing the Compensation Network................................... 26

Selecting the Soft Start Time..................................................... 26

Selecting the Input Capacitor ................................................... 26

Printed Circuit Board Layout Recommendations ..................... 27

Typical Application Circuit........................................................... 28

Factory Programmable Options................................................... 29

Factory Default Options............................................................ 30

Outline Dimensions....................................................................... 31

Ordering Guide .......................................................................... 31

REVISION HISTORY

9/15—Rev. A to Rev. B

Changes to Figure 1 and Table 1..................................................... 1

Changes to Figure 2.......................................................................... 3

Changes to Table 3............................................................................ 5

Changes to Figure 44...................................................................... 28

4/15—Rev. 0 to Rev. A

Changes to Figure 3...........................................................................8

3/15—Revision 0: Initial Version