ADP5053

Data Sheet

Rev. B | Page 2 of 36

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

Supervisory 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................................................................16

Buck Regulator Operational Modes.....................................16

Adjustable and Fixed Output Voltages.................................16

Internal Regulators (VREG and VDD)................................16

Separate Supply Applications...............................................17

Low-Side Device Selection...................................................17

Bootstrap Circuitry ..............................................................17

Active Output Discharge Switch ..........................................17

Precision Enabling...............................................................17

Oscillator..............................................................................17

Synchronization Input/Output.............................................18

Soft Start..............................................................................18

Parallel Operation................................................................19

Startup with Precharged Output..........................................19

Current-Limit Protection.....................................................19

Frequency Foldback.............................................................20

Hiccup Protection................................................................20

Latch-Off Protection............................................................20

Undervoltage Lockout (UVLO)...........................................21

Power-Good Function.........................................................21

Thermal Shutdown..............................................................21

Supervisory Circuit..............................................................21

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 Default Options......................................................35

Outline Dimensions................................................................36

Ordering Guide ...................................................................36

REVISION HISTORY

10/2016—Rev. A to Rev. B

Deleted Factory Programmable Options Section and Table 16 to

Table 30; Renumbered Sequentially.........................................33

Updated Outline Dimensions..................................................34

9/2015—Rev. 0 to Rev. A

Changes to Table 1.....................................................................1

11/2013—Revision 0: Initial Version